This document discusses various options for connecting dental restorations to implants, including screw retained, cement retained, and screwless systems. It highlights advantages and disadvantages of different abutment selections and placement positions. Custom abutments are described as an option to control porcelain thickness and manage excessive implant inclinations, though excessive angulation can compromise cement retention. Packing retraction cord and lingual access holes are presented as ways to reduce the risk of subgingival cement accumulation.
This document discusses occlusal schemes for implants, known as implant protective occlusion (IPO). IPO aims to reduce stress at the implant-bone interface through 14 considerations including eliminating premature contacts, positioning occlusal contacts over implant bodies, reducing cantilever lengths, and decreasing crown heights. The goals of IPO are to reduce force magnification, improve force direction, and increase the implant support area to promote implant longevity and success.
The document discusses implant dentistry and implant prosthetics. It covers topics such as reasons for dental implants, implant placement techniques, impressions, fixed and removable implant prostheses, and occlusion considerations. Implant placement can be done using two-stage or single-stage surgical protocols. Impressions can be taken at the fixture or abutment level using closed or open tray techniques. Restorations can be cement-retained or screw-retained. Proper occlusion is important to minimize risks and maximize function.
Implant abutment and implant abutment connectionsDR.BHAVESH JHA
this ppt enlightened with different types of implant abutment connection. Detailed classification of abutments. Different types of abutments. Latest trends of abutments. Smart abutments. Platform switching, rationale of platform switching and related articles.
loading protocols in dental implants about indications and contraindications of conventional , immediate,progressive and delayed loading of dental implants
There are several protocols for loading dental implants after surgery based on bone density and healing time requirements. Protocols include Brånemark's loading protocol, progressive loading, and immediate/early loading. The density of the bone where the implant is placed determines the appropriate loading protocol, as less dense bone requires more healing time before loading to allow for sufficient bone mineralization and strength. Progressive loading gradually increases stress on the implant over time to allow the bone to adapt, reducing risks of failure. It is particularly important for lower density bone which is weaker.
This document discusses the All on Four and All on Six dental implant concepts. It provides background on conventional rehabilitation approaches and challenges with atrophic jaws. Tilted implants are introduced as an alternative that places implants at an angle to bypass anatomical structures and increase prosthetic support. The All on Four concept involves placing four implants total, two in the front and two in the back at an angle, to support a fixed full-arch dental prosthesis. Advantages include avoiding complex surgery, providing immediate function, and reducing costs compared to other approaches. Treatment planning considerations and protocols for the surgical and prosthetic phases are outlined.
This document discusses implant supported overdentures. It begins by defining an overdenture and explaining how implants can enhance support, retention and stability of dentures. Some key advantages of implant supported overdentures are presented, such as preventing bone loss and improved function. Classification systems for prosthesis movement are covered, along with different types of overdenture attachments like ball attachments and O-rings. The document concludes by outlining two treatment options for implant supported overdentures.
This document discusses occlusal schemes for implants, known as implant protective occlusion (IPO). IPO aims to reduce stress at the implant-bone interface through 14 considerations including eliminating premature contacts, positioning occlusal contacts over implant bodies, reducing cantilever lengths, and decreasing crown heights. The goals of IPO are to reduce force magnification, improve force direction, and increase the implant support area to promote implant longevity and success.
The document discusses implant dentistry and implant prosthetics. It covers topics such as reasons for dental implants, implant placement techniques, impressions, fixed and removable implant prostheses, and occlusion considerations. Implant placement can be done using two-stage or single-stage surgical protocols. Impressions can be taken at the fixture or abutment level using closed or open tray techniques. Restorations can be cement-retained or screw-retained. Proper occlusion is important to minimize risks and maximize function.
Implant abutment and implant abutment connectionsDR.BHAVESH JHA
this ppt enlightened with different types of implant abutment connection. Detailed classification of abutments. Different types of abutments. Latest trends of abutments. Smart abutments. Platform switching, rationale of platform switching and related articles.
loading protocols in dental implants about indications and contraindications of conventional , immediate,progressive and delayed loading of dental implants
There are several protocols for loading dental implants after surgery based on bone density and healing time requirements. Protocols include Brånemark's loading protocol, progressive loading, and immediate/early loading. The density of the bone where the implant is placed determines the appropriate loading protocol, as less dense bone requires more healing time before loading to allow for sufficient bone mineralization and strength. Progressive loading gradually increases stress on the implant over time to allow the bone to adapt, reducing risks of failure. It is particularly important for lower density bone which is weaker.
This document discusses the All on Four and All on Six dental implant concepts. It provides background on conventional rehabilitation approaches and challenges with atrophic jaws. Tilted implants are introduced as an alternative that places implants at an angle to bypass anatomical structures and increase prosthetic support. The All on Four concept involves placing four implants total, two in the front and two in the back at an angle, to support a fixed full-arch dental prosthesis. Advantages include avoiding complex surgery, providing immediate function, and reducing costs compared to other approaches. Treatment planning considerations and protocols for the surgical and prosthetic phases are outlined.
This document discusses implant supported overdentures. It begins by defining an overdenture and explaining how implants can enhance support, retention and stability of dentures. Some key advantages of implant supported overdentures are presented, such as preventing bone loss and improved function. Classification systems for prosthesis movement are covered, along with different types of overdenture attachments like ball attachments and O-rings. The document concludes by outlining two treatment options for implant supported overdentures.
Zygomatic implants are placed through the alveolar crest and maxillary sinus involving the zygomatic bone for strong anchorage. They provide maximum support and durability compared to conventional implants due to their placement in dense cheek bone. Complications can include zygomatic bone fracture, orbital penetration, or implant head damage during surgery. Post-operative issues may involve screw fracture, implant failure, oroantral communication, soft tissue inflammation, or sinusitis. Zygomatic implants are best for patients with insufficient bone who need a single procedure rather than multiple surgeries, and a fixed prosthesis can be placed in as little as 72 hours.
This document provides an overview of implant supported overdentures, including definitions, history, indications, contraindications, advantages, disadvantages, treatment options, and procedures. Key points discussed include:
- Overdentures are removable prostheses that cover natural tooth roots, implants, or both for support.
- Implant supported overdentures have better outcomes than conventional dentures or overdentures supported only by natural tooth roots.
- Treatment options depend on factors like jaw, bone quality, number of implants, and can involve bar-retained or independent attachments.
- Procedures involve medical evaluation, treatment planning, transitional dentures, surgical placement, attachment connection, and definitive prosthesis fabrication
Dental implants can be classified in several ways based on placement, integration with tissues, material used, design, and surface characteristics. The main types of implants based on placement are endosteal, transosteal, subperiosteal, and intramucosal. Endosteal implants are the most common and include root form, blade form, and ramus form designs. Transosteal implants involve placing a plate through the chin bone. Integration can be via osseointegration, fibrointegration, or osseoadaptation. Materials include metallic alloys like titanium and non-metallic ceramics. Design and surface characteristics such as threads, perforations, coatings also define classifications.
Platform switching involves using a smaller diameter abutment on a larger diameter implant. This shifts the implant-abutment junction inward and away from the crestal bone. According to the document, platform switching reduces crestal bone loss in the following ways: 1) It shifts the inflammatory cell infiltrate inward, decreasing its effect on the crestal bone. 2) It maintains the biological width between the implant and bone. 3) It decreases stress levels in the peri-implant bone by shifting the stress concentration area away from the bone-implant interface. The document discusses the concept, history, advantages, and limitations of platform switching.
The document discusses various factors that can contribute to dental implant failures, including host factors like poor medical health, smoking, bruxism, and poor oral hygiene; surgical factors like trauma during surgery; and implant selection factors like bone quality. It provides definitions for different types of implant failures and lists criteria for determining implant success. The classifications, predictors, warning signs, and ways to enhance outcomes with implants are also examined.
This seminar deals with implant-related complications that lead to implant failure.this also discus diagnostic criteria and preventive methods for an implant failure.
The document discusses one-stage and two-stage implant placement procedures. In a two-stage procedure, implants are placed and submerged under soft tissue and allowed to heal for 2-6 months before being exposed in a second surgery. In a one-stage procedure, the implant or abutment emerges through soft tissue at initial placement. The document outlines the steps for implant site preparation, placement, flap closure, post-operative care, and second-stage exposure surgery in a two-stage approach.
Prosthetic options in implant dentistryNAMITHA ANAND
This document discusses various prosthetic options in implant dentistry. It begins by introducing different treatment options for completely and partially edentulous patients, noting that implant dentistry provides more options compared to traditional dentistry. It then covers Misch's classification system for prosthetic options (FP1-FP3, RP4-RP5), which are determined by the amount of hard and soft tissue replacement needed. The document discusses different prosthesis types for complete and partial edentulism in detail. It also covers considerations for prosthesis design such as crown height space, bone width, implant positioning and restorative materials. In conclusion, the optimal prosthetic option depends on the patient's existing oral condition and treatment goals.
This document discusses different types of implant abutments and their connections. It notes that any abutment can be divided into three segments: the prosthesis connection system, implant connection system, and transgingival system. The implant connection part should not be altered, but the other two parts may be modified for optimal treatment outcomes. The document goes on to describe different types of abutments and connections in more detail, including their advantages and disadvantages. It provides explanations of internal connections, platform switching, morse tapers, and friction-fit joints between abutments and implants.
This document discusses various options for connecting dental restorations to abutments and implants, including the biologic and technical issues involved. It compares screw-retained, cement-retained, and screwless systems. It also discusses arguments in favor of cementation, potential problems like cement accumulation, and the limits of cement retention related to factors like abutment angulation and axial wall height. Finally, it covers custom abutments, platform switching, and the next generation of the UCLA abutment using shape memory alloys.
The All-on-4 treatment involves placing only four dental implants - two in the front of each jaw and two tilted posteriorly at a 45 degree angle. This technique allows for fixed teeth to be placed even in patients with minimal bone volume, as the tilted posterior implants make use of available bone. Studies show a 98% success rate for All-on-4, and it provides patients with a permanent set of teeth similar to natural teeth, avoiding the need for removable dentures. The procedure is typically completed in one or two appointments, with temporary teeth placed immediately and permanent teeth in a follow up visit 6-8 months later.
This document discusses various complications that can occur with dental implants. It begins by classifying complications as accidents during surgery, early or late complications after surgery, and failures when desirable results are not achieved. Specific early complications discussed include bleeding/hematoma, swelling, ecchymosis, neurosensory disturbances, emphysema, and flap dehiscence. Late complications include failed osseointegration, peri-implantitis, and mechanical issues like screw loosening. The document provides details on causes and treatments for several common early complications.
This document summarizes key aspects of dental implant surgery including osseointegration, surgical considerations, anatomical considerations, implant stability assessment, one-stage versus two-stage surgery, and extraction and immediate implant placement. It discusses the direct bone-implant connection called osseointegration, factors that influence osseous healing like implant surface characteristics, and techniques for ensuring primary stability. Key anatomical structures like nerves and sinuses are reviewed for surgical safety. Methods of evaluating initial implant stability like resonance frequency analysis are presented. The document compares one-stage and two-stage surgical protocols and reviews when immediate placement is appropriate.
This document discusses the theoretical background and techniques of the Hobo full mouth rehabilitation approach. It defines key terms like condylar guidance, incisal guidance, and disocclusion. It explains that the goal of reorganizing occlusion is to address issues like trauma, poor function, or lack of space. The optimal occlusion balances factors like condylar path, incisal guidance, and cuspal angles. The articulator aims to replicate these concepts to guide reconstruction of the full mouth.
Obturator prosthesis for management of maxillary defectspriyanka konda
Obturators are prosthetic devices used to close congenital or acquired defects of the hard palate and/or soft palate. The document provides a history of obturators dating back to the 1530s and discusses their objectives, uses, design considerations, types including for congenital and acquired defects, and recent techniques. Key points are that obturators are designed for retention, stability, and support and that there are various types including immediate surgical, hollow bulb, inflatable, and magnet retained obturators. Recent techniques discussed 3D printing of obturators.
Classification and impression techniques of implants/ dentistry dental implantsIndian dental academy
Indian Dental Academy: will be one of the most relevant and exciting
training center with best faculty and flexible training programs
for dental professionals who wish to advance in their dental
practice,Offers certified courses in Dental
implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic
Dentistry, Periodontics and General Dentistry.
The document discusses various implant components and prosthodontic procedures. It describes the history and evolution of implant fixtures from the original Brånemark design to newer internal connection and tapered implants. It also covers abutment types including standard, esthetic, angled, UCLA and custom abutments. Impression techniques and the use of healing caps and gold cylinders are discussed for different clinical scenarios.
This document discusses immediate loading of dental implants. It defines immediate loading as loading an implant with a restoration within 2 weeks of placement. Immediate loading has benefits like eliminating a second surgery and allowing immediate function. However, it risks overloading the implant interface during bone healing. Factors that reduce this risk include increasing the implant surface area, decreasing occlusal forces, and using bone-friendly surfaces like hydroxyapatite. The document describes procedures for immediate loading in fully and partially edentulous patients, including using a provisional restoration made on the day of surgery or at a follow-up appointment. A soft diet is recommended during initial healing from immediate loading.
Indian Dental Academy: will be one of the most relevant and exciting training
center with best faculty and flexible training programs for dental
professionals who wish to advance in their dental practice,Offers certified
courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry,
Prosthetic Dentistry, Periodontics and General Dentistry.
Alignment of blocked out maxillary lateral incisors-jcojuly2000Indian dental academy
This document discusses aligning blocked out maxillary lateral incisors with deep overbites. It describes initially bonding brackets to the lingual surfaces of the lateral incisors to avoid occlusal interference, then using daily elastic wear to realign the teeth over a few months. This allows the blocked out teeth to move into favorable positions so brackets can then be bonded to the facial surfaces to complete alignment. The technique provides rapid realignment of blocked out teeth without need for biteplanes.
This document discusses biomechanics considerations for implant treatment planning and prosthesis design. It emphasizes controlling occlusal factors like cusp angles and occlusal table width to reduce cantilever effects and implant overload. Custom abutments are highlighted as a way to control these factors. The importance of proper implant positioning and attachment of implants to natural teeth with rigid rather than semi-precision attachments is also stressed.
Zygomatic implants are placed through the alveolar crest and maxillary sinus involving the zygomatic bone for strong anchorage. They provide maximum support and durability compared to conventional implants due to their placement in dense cheek bone. Complications can include zygomatic bone fracture, orbital penetration, or implant head damage during surgery. Post-operative issues may involve screw fracture, implant failure, oroantral communication, soft tissue inflammation, or sinusitis. Zygomatic implants are best for patients with insufficient bone who need a single procedure rather than multiple surgeries, and a fixed prosthesis can be placed in as little as 72 hours.
This document provides an overview of implant supported overdentures, including definitions, history, indications, contraindications, advantages, disadvantages, treatment options, and procedures. Key points discussed include:
- Overdentures are removable prostheses that cover natural tooth roots, implants, or both for support.
- Implant supported overdentures have better outcomes than conventional dentures or overdentures supported only by natural tooth roots.
- Treatment options depend on factors like jaw, bone quality, number of implants, and can involve bar-retained or independent attachments.
- Procedures involve medical evaluation, treatment planning, transitional dentures, surgical placement, attachment connection, and definitive prosthesis fabrication
Dental implants can be classified in several ways based on placement, integration with tissues, material used, design, and surface characteristics. The main types of implants based on placement are endosteal, transosteal, subperiosteal, and intramucosal. Endosteal implants are the most common and include root form, blade form, and ramus form designs. Transosteal implants involve placing a plate through the chin bone. Integration can be via osseointegration, fibrointegration, or osseoadaptation. Materials include metallic alloys like titanium and non-metallic ceramics. Design and surface characteristics such as threads, perforations, coatings also define classifications.
Platform switching involves using a smaller diameter abutment on a larger diameter implant. This shifts the implant-abutment junction inward and away from the crestal bone. According to the document, platform switching reduces crestal bone loss in the following ways: 1) It shifts the inflammatory cell infiltrate inward, decreasing its effect on the crestal bone. 2) It maintains the biological width between the implant and bone. 3) It decreases stress levels in the peri-implant bone by shifting the stress concentration area away from the bone-implant interface. The document discusses the concept, history, advantages, and limitations of platform switching.
The document discusses various factors that can contribute to dental implant failures, including host factors like poor medical health, smoking, bruxism, and poor oral hygiene; surgical factors like trauma during surgery; and implant selection factors like bone quality. It provides definitions for different types of implant failures and lists criteria for determining implant success. The classifications, predictors, warning signs, and ways to enhance outcomes with implants are also examined.
This seminar deals with implant-related complications that lead to implant failure.this also discus diagnostic criteria and preventive methods for an implant failure.
The document discusses one-stage and two-stage implant placement procedures. In a two-stage procedure, implants are placed and submerged under soft tissue and allowed to heal for 2-6 months before being exposed in a second surgery. In a one-stage procedure, the implant or abutment emerges through soft tissue at initial placement. The document outlines the steps for implant site preparation, placement, flap closure, post-operative care, and second-stage exposure surgery in a two-stage approach.
Prosthetic options in implant dentistryNAMITHA ANAND
This document discusses various prosthetic options in implant dentistry. It begins by introducing different treatment options for completely and partially edentulous patients, noting that implant dentistry provides more options compared to traditional dentistry. It then covers Misch's classification system for prosthetic options (FP1-FP3, RP4-RP5), which are determined by the amount of hard and soft tissue replacement needed. The document discusses different prosthesis types for complete and partial edentulism in detail. It also covers considerations for prosthesis design such as crown height space, bone width, implant positioning and restorative materials. In conclusion, the optimal prosthetic option depends on the patient's existing oral condition and treatment goals.
This document discusses different types of implant abutments and their connections. It notes that any abutment can be divided into three segments: the prosthesis connection system, implant connection system, and transgingival system. The implant connection part should not be altered, but the other two parts may be modified for optimal treatment outcomes. The document goes on to describe different types of abutments and connections in more detail, including their advantages and disadvantages. It provides explanations of internal connections, platform switching, morse tapers, and friction-fit joints between abutments and implants.
This document discusses various options for connecting dental restorations to abutments and implants, including the biologic and technical issues involved. It compares screw-retained, cement-retained, and screwless systems. It also discusses arguments in favor of cementation, potential problems like cement accumulation, and the limits of cement retention related to factors like abutment angulation and axial wall height. Finally, it covers custom abutments, platform switching, and the next generation of the UCLA abutment using shape memory alloys.
The All-on-4 treatment involves placing only four dental implants - two in the front of each jaw and two tilted posteriorly at a 45 degree angle. This technique allows for fixed teeth to be placed even in patients with minimal bone volume, as the tilted posterior implants make use of available bone. Studies show a 98% success rate for All-on-4, and it provides patients with a permanent set of teeth similar to natural teeth, avoiding the need for removable dentures. The procedure is typically completed in one or two appointments, with temporary teeth placed immediately and permanent teeth in a follow up visit 6-8 months later.
This document discusses various complications that can occur with dental implants. It begins by classifying complications as accidents during surgery, early or late complications after surgery, and failures when desirable results are not achieved. Specific early complications discussed include bleeding/hematoma, swelling, ecchymosis, neurosensory disturbances, emphysema, and flap dehiscence. Late complications include failed osseointegration, peri-implantitis, and mechanical issues like screw loosening. The document provides details on causes and treatments for several common early complications.
This document summarizes key aspects of dental implant surgery including osseointegration, surgical considerations, anatomical considerations, implant stability assessment, one-stage versus two-stage surgery, and extraction and immediate implant placement. It discusses the direct bone-implant connection called osseointegration, factors that influence osseous healing like implant surface characteristics, and techniques for ensuring primary stability. Key anatomical structures like nerves and sinuses are reviewed for surgical safety. Methods of evaluating initial implant stability like resonance frequency analysis are presented. The document compares one-stage and two-stage surgical protocols and reviews when immediate placement is appropriate.
This document discusses the theoretical background and techniques of the Hobo full mouth rehabilitation approach. It defines key terms like condylar guidance, incisal guidance, and disocclusion. It explains that the goal of reorganizing occlusion is to address issues like trauma, poor function, or lack of space. The optimal occlusion balances factors like condylar path, incisal guidance, and cuspal angles. The articulator aims to replicate these concepts to guide reconstruction of the full mouth.
Obturator prosthesis for management of maxillary defectspriyanka konda
Obturators are prosthetic devices used to close congenital or acquired defects of the hard palate and/or soft palate. The document provides a history of obturators dating back to the 1530s and discusses their objectives, uses, design considerations, types including for congenital and acquired defects, and recent techniques. Key points are that obturators are designed for retention, stability, and support and that there are various types including immediate surgical, hollow bulb, inflatable, and magnet retained obturators. Recent techniques discussed 3D printing of obturators.
Classification and impression techniques of implants/ dentistry dental implantsIndian dental academy
Indian Dental Academy: will be one of the most relevant and exciting
training center with best faculty and flexible training programs
for dental professionals who wish to advance in their dental
practice,Offers certified courses in Dental
implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic
Dentistry, Periodontics and General Dentistry.
The document discusses various implant components and prosthodontic procedures. It describes the history and evolution of implant fixtures from the original Brånemark design to newer internal connection and tapered implants. It also covers abutment types including standard, esthetic, angled, UCLA and custom abutments. Impression techniques and the use of healing caps and gold cylinders are discussed for different clinical scenarios.
This document discusses immediate loading of dental implants. It defines immediate loading as loading an implant with a restoration within 2 weeks of placement. Immediate loading has benefits like eliminating a second surgery and allowing immediate function. However, it risks overloading the implant interface during bone healing. Factors that reduce this risk include increasing the implant surface area, decreasing occlusal forces, and using bone-friendly surfaces like hydroxyapatite. The document describes procedures for immediate loading in fully and partially edentulous patients, including using a provisional restoration made on the day of surgery or at a follow-up appointment. A soft diet is recommended during initial healing from immediate loading.
Indian Dental Academy: will be one of the most relevant and exciting training
center with best faculty and flexible training programs for dental
professionals who wish to advance in their dental practice,Offers certified
courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry,
Prosthetic Dentistry, Periodontics and General Dentistry.
Alignment of blocked out maxillary lateral incisors-jcojuly2000Indian dental academy
This document discusses aligning blocked out maxillary lateral incisors with deep overbites. It describes initially bonding brackets to the lingual surfaces of the lateral incisors to avoid occlusal interference, then using daily elastic wear to realign the teeth over a few months. This allows the blocked out teeth to move into favorable positions so brackets can then be bonded to the facial surfaces to complete alignment. The technique provides rapid realignment of blocked out teeth without need for biteplanes.
This document discusses biomechanics considerations for implant treatment planning and prosthesis design. It emphasizes controlling occlusal factors like cusp angles and occlusal table width to reduce cantilever effects and implant overload. Custom abutments are highlighted as a way to control these factors. The importance of proper implant positioning and attachment of implants to natural teeth with rigid rather than semi-precision attachments is also stressed.
Indian Dental Academy: will be one of the most relevant and exciting
training center with best faculty and flexible training programs
for dental professionals who wish to advance in their dental
practice,Offers certified courses in Dental
implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic
Dentistry, Periodontics and General Dentistry.
Materials for interocclusal records and their ability to/ dental education in...Indian dental academy
Indian Dental Academy: will be one of the most relevant and exciting training
center with best faculty and flexible training programs for dental
professionals who wish to advance in their dental practice,Offers certified
courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry,
Prosthetic Dentistry, Periodontics and General Dentistry.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Materials for interocclusal records and their ability to/cosmetic dentistry c...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The document discusses principles of dental preparation design including preservation of tooth structure, retention and resistance form, structural durability, and marginal integrity. It describes types of dental restorations like inlays, onlays, partial veneer crowns, and full veneer crowns. Key factors in preparation design are discussed such as retention, resistance, convergence angles, grooves, and marginal designs. Contouring and special considerations for crown contours that impact tissue health and esthetics are also summarized.
This document discusses overlay partial dentures and the use of implants to support them. It describes how overlay partial dentures can maintain tooth support and bone, while improving esthetics. Examples are provided of overlay denture designs from the 1930s-1990s, highlighting lessons learned about protecting abutment teeth. The use of implants to supplement existing dentition or replace key abutments is discussed, along with a case example of an implant-assisted overlay partial denture. Unanticipated implant failures are also summarized.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Thank you for the presentation. I found it very informative regarding the principles of designing removable partial dentures for patients with defects of the maxilla and mandible.
This document discusses the restoration of ear defects through both surgical and prosthetic means. It begins by outlining favorable alterations that can be made at surgery, such as retaining the tragus and lining defects with skin grafts. It then discusses presurgical consultations, making impressions, sculpting prostheses, and techniques for coloring and finishing them. Methods for restoring partial ear defects are presented, as well as the use of craniofacial implants. Surgical templates, bar designs, and soft tissue considerations for implants are outlined. The document emphasizes producing a natural appearance and stable, long-term restorations.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
- The document discusses the challenges of designing dentures that oppose natural dentition, including achieving bilateral balanced occlusion to prevent tipping of the denture.
- It describes various difficulties like excessive forces on denture bearing areas from retained roots or implants, as well as occlusal plane discrepancies from things like supererupted teeth.
- These issues can lead to problems like tipping of the denture and generation of harmful lateral forces, potentially causing bone resorption over time.
- The document provides strategies for addressing these challenges, such as correcting occlusal discrepancies, retaining root tips for support, using implants, and avoiding excessive anterior tooth overlap.
Maxillary obturators are used to close defects after maxillectomy surgery. This document discusses techniques for relining obturators using thermoplastic wax. It also addresses issues like preventing fluid leakage, engaging the nasal side of the soft palate, and extensions into orbital or pharyngeal defects. Traumatic defects pose additional challenges due to poor tissue quality and bone displacement. Obturators must be carefully designed and fitted to restore function.
This document discusses cement retention versus screw retention for dental implants. Both methods can be used if done properly. Cement retention is simpler but risks residual cement being left under gums, which can lead to peri-implantitis. Screw retention allows easy removal but requires access holes. Residual subgingival cement is the major problem, as it is difficult to fully remove and can cause inflammation and bone loss over time.
This document discusses different treatment options for edentulous maxillas including fixed prostheses and implant supported/assisted prostheses. It covers patient selection factors like resorption patterns, jaw relations, lip line, sinus anatomy and economics. Minimum implant requirements, biomechanics, complications and different types of fixed prostheses like PFM and hybrid are described. The document also presents a clinical case of an implant supported fixed partial denture.
This document discusses design concepts for removable partial dentures for patients with maxillary defects following radical maxillectomy surgery. Key points include: 1) RPD designs must direct forces along the long axis of abutment teeth to prevent overloading, 2) anterior teeth adjacent to defects require cingulum rests for support, 3) arch form, defect size, and remaining dentition impact design and degree of movement, 4) additional retention features may be needed for less favorable defects and arch forms. The goal is to support resection sites while preventing excessive stresses on abutment teeth.
There are three basic phases of the digital workflow when designing and/or fabricating removable partial denture frameworks; data acquisition, designing (computer aided design (CAD)), and computer-aided manufacturing (CAM). The bulk of this presentation is dedicated to the design steps used in this workflow utilizing sample maxillary and mandibular casts
There are three basic phases of the digital workflow when designing and/or fabricating removable partial denture frameworks; data acquisition, designing (computer aided design (CAD)), and computer-aided manufacturing (CAM). The bulk of this presentation is dedicated to the design steps used in this workflow utilizing sample maxillary and mandibular casts
This document discusses prosthodontic procedures and complications in posterior quadrants. It covers topics such as exam and workup, selection of implants, platform switching, abutment selection, provisional restorations, and new technologies like shape memory sleeve abutments. Key points addressed include that no implant design has been proven superior for marginal bone loss, and custom abutments offer better control of margins and occlusal thickness than prefabricated abutments. New technologies aim to simplify procedures and improve retrievability of restorations.
This document discusses single tooth defects in the posterior quadrants and their restoration. It compares fixed dental prostheses to implants, noting that implants are generally preferred when adjacent teeth are healthy or nearly so. For endodontically treated teeth, a fixed restoration is preferred if sufficient tooth structure remains and occlusion and parafunction are minimal. Considerations for implant placement include anatomic factors, timing of placement, and prosthodontic issues like abutment selection and cement versus screw retention. The goal is to restore function while avoiding complications like fracture, overload, and peri-implantitis.
This document discusses implant biomechanics and treatment planning considerations for restoring posterior quadrants. It notes that implant restorations must be designed to avoid overload, as excessive loads can lead to bone loss and implant failure over time. Key factors discussed include implant number, length, alignment relative to curves of Spee and Wilson, and linear versus curvilinear configurations. Curvilinear arrangements are emphasized as withstanding more load than linear arrangements due to greater cross-arch stabilization. Case examples demonstrate successful long-term outcomes and failures where biomechanics were not adequately considered.
This document discusses the use of implants to supplement removable partial dentures (RPDs) in various clinical situations. Implants can be used to improve support, stability, and retention of RPDs when existing dentition is compromised. Common scenarios include using implants in extension base RPDs, with questionable implant anchorage or unfavorable configurations, to replace lost implants in key locations, replace a lost natural tooth abutment, or supplement insufficient existing dentition. Resilient attachments are often used to retain implant-assisted RPDs while avoiding implant overload. Complications can include peri-implantitis, loose abutments, and wear of attachments. Overlay RPDs are also discussed as an option to
This document discusses computer guided treatment planning and implant placement. It describes how computer guided planning allows visualization of potential implant sites in 3D and more precise placement compared to free-hand drilling. Fully guided surgery uses surgical templates to control position, angle, depth and diameter of osteotomies, while semi-guided surgery controls initial position and angle only, allowing more flexibility. Fully guided is used for edentulous patients, while semi-guided is preferred for partially edentulous patients where soft tissue manipulation or bone grafting may be needed.
This document discusses dental implants, specifically angled (tilted) implants used to restore edentulous maxillas. It describes several approaches for using tilted implants, including placing 4-6 implants with angled abutments to offset the implant angles, or using co-axis implants where angulation correction is subgingival. Tilted implants provide advantages like longer distal implants, improved primary stability, and eliminating the need for sinus augmentation. Studies show success rates above 90% for tilted implants.
Crowns significantly improve the success of endodontically treated posterior teeth but do not improve the success of anterior teeth. Posterior teeth require crowns more often than anterior teeth due to greater cuspal deflection after root canal treatment. The main purpose of a post is to retain a core, not strengthen teeth. Posts should extend to retain 5mm of gutta percha and not exceed 7mm in molars. The diameter of posts should not exceed one-third of the root diameter and range between 0.6-1.2mm. A ferrule of at least 2mm helps prevent tooth fracture.
Charles J. Goodacre presents on provisional restorations in fixed prosthodontics. He discusses the functions and requirements of provisional restorations including protection, mastication, esthetics, positional stability, and providing diagnostic information. He describes various provisional restoration resins and their properties. Goodacre also outlines different types of provisional restorations including prefabricated, custom-fabricated, direct and indirect techniques. He demonstrates techniques for direct provisional restorations using templates and indirect restorations fabricated by a laboratory.
This document discusses secondary impression materials used in fixed prosthodontics. It defines an impression as a negative reproduction of prepared teeth that provides information to fabricate a crown or fixed prosthesis. Impressions can be physical materials or digital scans. Physical impressions include reversible hydrocolloid, condensation silicone, polysulfide, polyether, and addition silicone. Custom trays are often used and are fabricated from autopolymerizing or light-cured resin. Ideal impressions accurately record all prepared surfaces and maintain dimensional stability until the laboratory casts are made.
This document discusses techniques for fluid control and tissue management during fixed prosthodontic impressions. It describes the need to displace gingiva to record tooth structure below the finish line. Various methods of fluid control are outlined, including retraction cords, suction, and isolite systems. Retraction cords should be moistened with hemostatic agents before gentle placement to displace tissue. The document recommends a two-cord technique using different diameter cords and additional hemostatic agents if needed to control bleeding and produce accurate impressions. Proper fluid management is essential for high quality fixed prosthodontic impressions.
This document provides an overview of ceramics used in fixed prosthodontics. It discusses various types of ceramics including glass ceramics, glass infiltrated mixtures, and polycrystalline ceramics. Examples mentioned include lithium disilicate, zirconia, and alumina. The document reviews clinical indications and uses of different ceramics, as well as case considerations, preparation designs, and causes of failure. An outline is provided of the topics to be covered in the presentation on ceramics in dental practice.
1) There are two main hardening mechanisms for dental cements - acid-base reactions and polymerization reactions. Common cements that use acid-base reactions include zinc phosphate, polycarboxylate, and glass ionomer cements. Resin cements use a polymerization reaction.
2) Zinc phosphate cement has a long history of success but lacks adhesion and fluoride release. Polycarboxylate cement bonds to tooth structure and has short mixing/working times. Glass ionomer cement releases fluoride and bonds to tooth structure.
3) Resin-modified glass ionomer cement combines the benefits of glass ionomer cement with the strength and handling of resin, providing good early strength and reduced moisture sensitivity.
1. Single tooth defects in the posterior quadrants can often be restored with either fixed dental prostheses or dental implants, depending on the clinical situation and anatomical factors.
2. Implant placement can be immediate, delayed, or staged depending on factors like infection, bone quality, and proximity to anatomical structures.
3. Site enhancement procedures may be needed to augment bone in order to place implants in ideal positions and ensure adequate bone volume.
This document summarizes research on the success rates and complications of resin bonded prostheses (RBPs). It finds that on average, 26% of RBPs experience complications within 4 years, increasing to 28% after 5 years, with debonding being the most common at 21%. Debonding rates are higher for posterior teeth, longer spans, and cantilever designs. Tooth preparation techniques like covering lingual and proximal surfaces, adding proximal grooves or pinholes, and occlusal rests can reduce debonding. Maintaining a minimum of 0.5mm occlusal clearance and 1mm metal thickness also impacts success. Proper diagnosis, treatment planning and cementation techniques are keys to optimizing longevity
This document is a lecture on fixed partial denture (FPD) designs by Charles J. Goodacre from Loma Linda University School of Dentistry. The lecture discusses key considerations for FPD treatment planning including tooth stability, occlusal forces, abutment selection, and material choices. It provides examples of different FPD designs for single and multiple tooth replacements in the maxilla and mandible. Challenges with each case such as cantilevers, oral hygiene access, and risk of failure are evaluated. The goal is to create the best online programs of instruction in prosthodontics.
Crowns significantly improve the success of endodontically treated posterior teeth. Posts are primarily used to retain cores and do not strengthen teeth. The appropriate post length is to extend to the radiographic apex with 5mm of gutta percha retained. Post diameter should not exceed 1/3 of the root diameter and range from 0.6-1.2mm. A ferrule of at least 2mm is recommended to prevent root fracture.
This document discusses various dental cements and cementation procedures. It describes the compositions, characteristics, and mixing procedures of different cement types including provisional cements, zinc phosphate cement, polycarboxylate cement, glass ionomer cement, resin-modified glass ionomer cement, resin cement, and calcium aluminate cement. It also outlines various clinical procedures for cementation such as provisional crown removal, tooth preparation, crown placement, adjustment, and cement cleanup.
This document discusses provisional restorations in fixed prosthodontics. It describes the functions and requirements of provisional restorations, including protection, mastication, esthetics, positional stability, and providing diagnostic information. It discusses different materials used for provisional restorations like methyl methacrylate, ethyl methacrylate, and composite resins. It also describes different types of provisional restorations including prefabricated shells, custom-fabricated templates, and cast metal. Both direct and indirect techniques are covered.
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Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-and-domino-license-cost-reduction-in-the-world-of-dlau/
The introduction of DLAU and the CCB & CCX licensing model caused quite a stir in the HCL community. As a Notes and Domino customer, you may have faced challenges with unexpected user counts and license costs. You probably have questions on how this new licensing approach works and how to benefit from it. Most importantly, you likely have budget constraints and want to save money where possible. Don’t worry, we can help with all of this!
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Join HCL Ambassador Marc Thomas in this webinar with a special guest appearance from Franz Walder. It will give you the tools and know-how to stay on top of what is going on with Domino licensing. You will be able lower your cost through an optimized configuration and keep it low going forward.
These topics will be covered
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- How do CCB and CCX licenses really work?
- Understanding the DLAU tool and how to best utilize it
- Tips for common problem areas, like team mailboxes, functional/test users, etc
- Practical examples and best practices to implement right away
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HCL Notes und Domino Lizenzkostenreduzierung in der Welt von DLAUpanagenda
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-und-domino-lizenzkostenreduzierung-in-der-welt-von-dlau/
DLAU und die Lizenzen nach dem CCB- und CCX-Modell sind für viele in der HCL-Community seit letztem Jahr ein heißes Thema. Als Notes- oder Domino-Kunde haben Sie vielleicht mit unerwartet hohen Benutzerzahlen und Lizenzgebühren zu kämpfen. Sie fragen sich vielleicht, wie diese neue Art der Lizenzierung funktioniert und welchen Nutzen sie Ihnen bringt. Vor allem wollen Sie sicherlich Ihr Budget einhalten und Kosten sparen, wo immer möglich. Das verstehen wir und wir möchten Ihnen dabei helfen!
Wir erklären Ihnen, wie Sie häufige Konfigurationsprobleme lösen können, die dazu führen können, dass mehr Benutzer gezählt werden als nötig, und wie Sie überflüssige oder ungenutzte Konten identifizieren und entfernen können, um Geld zu sparen. Es gibt auch einige Ansätze, die zu unnötigen Ausgaben führen können, z. B. wenn ein Personendokument anstelle eines Mail-Ins für geteilte Mailboxen verwendet wird. Wir zeigen Ihnen solche Fälle und deren Lösungen. Und natürlich erklären wir Ihnen das neue Lizenzmodell.
Nehmen Sie an diesem Webinar teil, bei dem HCL-Ambassador Marc Thomas und Gastredner Franz Walder Ihnen diese neue Welt näherbringen. Es vermittelt Ihnen die Tools und das Know-how, um den Überblick zu bewahren. Sie werden in der Lage sein, Ihre Kosten durch eine optimierte Domino-Konfiguration zu reduzieren und auch in Zukunft gering zu halten.
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- Wie funktionieren CCB- und CCX-Lizenzen wirklich?
- Verstehen des DLAU-Tools und wie man es am besten nutzt
- Tipps für häufige Problembereiche, wie z. B. Team-Postfächer, Funktions-/Testbenutzer usw.
- Praxisbeispiele und Best Practices zum sofortigen Umsetzen
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Topics covered:
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Speaker:
Lyndsey Byblow, Test Suite Sales Engineer @ UiPath, Inc.
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2. Restoration connection to abutment
and/or implant fixture
Biologic and technical issues
v Screw retained systems
v Cement retained systems
v Screwless - cementless system (UCLA II)
v Platform reduction (ie platform switching)
3. Treatment Planning
Surgical Placement
Faciolingual position of the anterior implant
should be aligned under the cingulum of the
proposed crown for screw retained restorations
and under the incisal edge for cement retained
restorations. Posterior implant should be centered
faciolingually for reducing the potential for
overloading.
Implant along the
incisal edge for
Implant was aligned cement retained PFM
Implant is centered. under the cingulum for
screw retained PFM
4. Implant Placement
v Perpendicular to the occlusal
plane
v Tooth positions
v Avoid proximal positions
v Screw access channel should
exit in the central fossa
5. Advantages of Proper Implant
Positioning
l Proper emergence profiles can be
developed
l Space available interproximally for
hygiene access (arrow)
l Control of occlusal anatomy (narrowed
occlusal table and flat cusp angles)
l Occlusal loads delivered axially
l Abutment selection simplified
6. Misalignment of Implants - Custom abutments
The implants placed in the right mandible
were inclined towards the lingual
7. Misalignment of Implants - Custom abutments
This technique permits the clinician to control two key occlusal factors –
width of the occlusal table, and the cusp angles. Result: Reduced load
magnification and less chance of implant overload.
8. Arguments commonly
used in favor of cementation
v It’s
a common procedure in the dental office: No
“Implant” knowledge necessary?
v Implants for dummies
v The screw access hole is through the labial or buccal
v Other options - Lingual set screws-lab expense and lab expertise
v Simple traditional impression techniques?
v Packing gingival retraction cord vs screw retained impression copings
v Better esthetics?
v Permits the use of zirconium abutments. Predictability of Zirconium
abutments?
v Fit isn’t as critical
v Really? The assumption is that a misfit is just a passive cement gap
with no negative consequences
9. Cement Retained Restorations
Advantage
v Simple
Problems
v Risk o subgingival cement
accumulation
v Lack of retrievability
10. Preformed nonprepable abutments
Considerations for use:
v Tissue height essentially the same 360 degrees around the
abutment
v Abutment cement margin just subgingival
v Sufficient clearance for sufficient axial wall height for predictable
cement retention
v Angulation allows reasonable draw with adjacent teeth
12. Preformed nonprepable abutments
v The margin between the crown and the abutment does not
follow the gingival margin. Note that the proximal margins are
4-6 mm below the gingival margin.
v In this situation there is significant risk of trapping cement
beneath the gingival tissues upon cementation.
13. Preformed nonprepable abutments
This patient presented with severe peri-implantitis 3 years
post insertion of the crown.
A subsequent
x-ray, taken at
right angles to
the long axis of
the implant,
The initial x-ray revealed that
appeared to the crown, was
indicate that the not seated.
crown was seated.
Inability to completely seat the crown onto the abutment is a
common complication associated with prefomed abutments.
Lingual access holes may help relieve the hydraulic pressure and
enable seating of the crown.
14. Preformed nonprepable abutments
Cement was trapped
beneath the gingiva during
delivery of the crown and
was not detected.
Note the inflammation associated with the peri-implant
gingiva 2 1/2 years post insertion.
15. Preformed nonprepable abutments
Issues of concern
v Position
of the cement margin in relation to
the gingival margin
v Particularly significant in the anterior region
v Impaction of cement into the gingival sulcus
v Difficulty in seating the crown because of
hydraulic pressure
17. Prepable abutments
Abutment prepared on the master cast
Impressions are made in the
usual manner. The prepable
abutment is secured to the
implant fixture and prepared on
the cast.
19. Prepable abutment and the risk of
subgingival cement accumulation
v The prepable abutment was secured in position with an
abutment screw and the crown cemented.
v The patient was not pleased with the esthetics and so a hole
was drilled into the occlusal surface and the abutment
screw removed.
v Note the accumulation of cement on the abutment.
20. Subgingival cement accumulation
Sulcus Epithelium
Implant Surface
Why is there a greater risk of
cement accumulation in the
sulcus of implant crowns?
Peri-implant
tissues are
more easily
displaced from
Circumferential
the surface of
collagen fibers
the restoration.
Bone
21. Packing cord to prevent
subgingival cement accumulation
v Subgingival cement accumulation can be limited by
packing gingival retraction cord prior to cementation
v Zirconium abutment allows the creation of an all ceramic
restoration from the implant to the incisal edge. Is there an
esthetic advantage?
22. Custom abutments with
screw retained restorations
Advantages
v Control thickness
of labial porcelain
v Used when the
Waxing implant is inclined
sleeve excessively to the
labial.
v Retrievable
Full contour wax
pattern is developed
23. Custom abutments with
screw retained restorations
Wax cut back
Sprued
wax
pattern
Lingual retention screw channel
25. Custom abutments with
screw retained restorations
Coping
Completed and
sprued wax pattern
Lingual retention
screw channel Labial index
fabricated following
the full contour wax
pattern.
31. Custom abutments with
screw retained restorations
Gingival levels do
not match but the
the patient does
not display his
gingiva during a
high smile.
32. Custom abutments allows the use of pink porcelain
Porcelain has been baked onto the custom abutment
33. Custom abutments with
screw retained restorations
Excessive labial inclinations
The axial wall lengths are
frequently inadequate for
effective cement retention
34. Custom abutments with
screw retained restorations
Labial axial walls are insufficient to retain a cemented restoration.
37. Limits of Cement Retention
Implants angled excessively to the labial or
buccal
v Axialwall height limits the retention
v Shortest wall determines retention
v Minimum height of axial wall – 4 mm.
38. Zirconium custom abutments
Cement retained
v Allows the creation of an all ceramic restoration
from the implant to the incisal edge. Is there an
esthetic advantage? Probably not
v The main issue is positioning of the cement
margin
v Incidence of fracture has yet to be determined.
39. Zirconium custom abutments
Cement retained
Courtesy Dr. A. Sharma
v Allows the creation of an all ceramic restoration from
the implant to the incisal edge. Is there an esthetic
advantage? Probably not.
v The main issue is positioning of the cement margin
v Incidence of fracture has yet to be determined.
40. Fit isn’t as critical ?
Really? The assumption is that a misfit is just a passive
cement gap with no negative consequences
The restoration appears
to precisely fit the
master cast. However,
will it fit the patient?
41. Fit isn’t as critical ?
Really? The assumption is that a misfit is just a
passive cement gap with no negative consequences
Unfortunately, this was not the case. If you cement this case
there will be a sizable cement margin and you may overload the
implants.
42. Fit isn’t as critical ?
Really? The assumption is that a misfit is just a passive cement
gap with no negative consequences
When the impression is made
with linked open tray
impression copings and the
original restoration placed on
the master cast the misfit is
profound.
43. Fit isn’t as critical ?
Really? The assumption is that a misfit is just a passive
cement gap with no negative consequences
New Bridge on accurate model
44. Emergence Profile Compromises
Screw vs Cement Retained
v Cemented crown contour v Screw retained crown
begins ideally just apical to the can carry ideal contour
marginal soft tissue, which can
all the way to the head
produce the classic “pancake”
crown. of the implant (arrow)
45. Summary: Limits of Cement Retention
v Axial wall height limits the retention
v Shortest wall determines retention
v Minimum height – 4 mm.
v Restoration not easily retrieved
v Subgingival cement accumulation
v Compromised emergence profiles when interocclusal
space is lacking
46. Arguments in favor of screw retained restorations
v Carry restoration more subgingivally than we can
predictably remove cement.
v Formore ideal emergence profile and contour.
v Avoid trapping cement subgingivally
v More predictable seating of bridge pontic or even
single tooth given the gingival contour.
v Better retention particularly when a cemented
restoration would have a very short axial wall.
v Easier to restore when there is limited inter-
occlusal or restorative space
47. Next Generation of the UCLA Abutment
Shape Memory Sleeve (Seo and Wu)
❖ The treatment procedure is similar to current methods
48. The Next Generation of the UCLA
Abutment
Shape Memory Sleeve
“Nitinol”
(Nickel titanium alloy)
49. Next Generation of the UCLA Abutment
(Seo and Wu)
Issues
v Is Nitinal biocompatible?
v Will the increase in temperature during
activation be transmitted to the fixture,
abutment and underlying tissues?
v What is the quality of the retention?
v Will it stand up to repeated occlusal
loading
v Galvanic reactions?
50. Next Generation of the UCLA Abutment
Safety of Shape Memory Alloy, “Nitinol”
(Nickel titanium alloy)
‣ Nitinol is safe and bio-compatible
‣ Many devices are approved by FDA
‣ Economical to manufacture
Heart balloon
Arch bars
Heart stent
51. Release of the crown
Shape memory device is activated by heat
Activation brings the temperature up to 55
degrees Centigrade. It’s a shape change
52. Next Generation of the UCLA Abutment
Measurement of Temperature Rise in Abutment and
Implant Fixture During Heat Activation
53. Next Generation of the UCLA Abutment
Measurement of Temperature Rise in Abutment
and Implant Fixture During Heat Activation
ΔT, implant fixture (°C)
ΔT, abutment (°C)
Passive air cool
1.4
2.8
Forced air cool
0.3
2.1
54. Next Generation of the UCLA Abutment
Measurement of Retention Strength
Temperature
Chamber
55. Next Generation of the UCLA Abutment
Measurement of Retention Strength
- Set up -
Assembly: implant
Saline chamber: body temperature
fixture + abutment +
RODO sleeve
56. Measurement of Retention Strength
Results
Min - Max. (N)
Provisional cement
30 - 250
Zinc phosphate
330 - 346
RODO Device! 275 - 1,500!
Shape memory sleeve after the test
57. Measurement of Maximum Compressive
Strength
ISO 14801 Guideline
- Set up -
Assembly: implant fixture + Saline Chamber
abutment + RODO sleeve
(Body Temperature)
58. Measurement of Maximum
Compressive Strength
Results
Maximum Abutment Strength
Failed at abutment- *No failure in the RODO Device
implant fixture interface
750 N
Failure of Conventional Abutments : 800 ~ 1,000 N
Screw fractured
59. Next Generation of the UCLA Abutment
ISO 14801:2007-11-15
Dynamic Fatigue Test for Endosseous Dental
Implants
Failed at abutment- Displacement controlled fatigue performance
implant fixture interface
*No failure in the RODO Device
50 - 400
Screw failed at 6000 cycles Minimum # of cycles
60. Next Generation of the UCLA Abutment
(Seo ,Wu and Shah)
Upcoming Studies
v Galvanic testing
v Short term IRB trial at UCLA School of Dentistry
(Kumar Shah and Neil Garrett)
v Long term IRB trials at UCLA, other universities
and private clinics in the US commenced
summer 2011.
Patients with known nickel allergies not candidates
61. Platform Reduction and Etiology of Marginal
Bone Loss around Implants
Original Branemark design lost bone down to the first
thread. Why?
v Thread design?
v Surface topography?
v Conical implant seal?
v Design of the neck?
v Platform reduction?
(switching)
62. Etiology of the initial bone loss
around implants
v Almost immediately the
original “Branemark”
design lost bone down to
the first thread.
v Other designs such as the
“Astra” design appear to
retain their bone levels
v What is the evidence?
What are the likely explanations
for this difference?
63. Etiology of initial bone loss around implants
Angulation of the neck
v An implant is torqued into position with 45 Newtons
v However, the torque values around the neck of the
implant imbedded in the cortical bone is probably
closer to 100 Newtons.
v Will these values predispose to resorption to the
cortical bone around the neck of the implant when the
angle of the implant is acute?
64. Etiology of initial bone loss around implants
v Angulation of the neck
v Whenocclusal loads are applied will the implants
with acute angles atop of the implant overload
the bone in this area precipitating a resorptive
remodeling response and bone loss?
65. Platform reduction (platform switching)
Courtesy G. Perri Courtesy C. Stanford
v Note the bone levels atop the implant.
v Is it the result of the horizontalization of the
biologic width (platform reduction)?
66. Platform reduction (platform switching)
Courtesy G. Perri Courtesy C. Stanford
The evidence is far from clear.
v In these examples the angulation of the top of the
implant may be the more important factor
v In addition in both these implant systems the micro-rough
surface was extended to the top of the implant. This also,
may contribute to the maintenance of bone levels atop
the implant.
67. Angulation of the neck
v Some authors have maintained that the angulation
atop the implant is the most important factor.
(Braun, et al, 2006; Iacono et al , 2006)
v They attribute the maintenance of bone atop of the
implant to the so-called “negative” slope (dotted
lines).
68. The presence of micro-threads
Courtesy G. Perri Courtesy C. Stanford
Is it the result of the microthreads
around the neck of the implant?
69. Internal interlocking vs external hex
system
Conical seal
v Allabutment – implant fixture interfaces demonstrate gaps
upon loading from 10-50 microns. The original external hex
systems demonstrates the largest gaps during flexure.
v Do these gaps harbor micro-organism which in turn precipitate
an inflammatory response leading to bone loss around the
neck of the implant?
70. Marginal Bone Loss
Based on a Med Line search, a review of the literature
indicated that no implant system, surface or design
was found superior with regards to marginal bone loss
(Abrahamsson and Berhlundh, 2009)
71. Platform Switching (Reduction)
Will this type of implant fixture – abutment configuration
minimize the bone loss around the neck of implants?
Based on a review by Bateli and Strub (2011) “the current
literature provides insufficient evidence about the effectiveness
of any specific modification in the implant neck area in preserving
marginal bone or preventing marginal bone loss”
72. One piece systems
Nobel direct and similar one piece systems
There are no gaps developing between an
abutment and fixture. Why the bone loss?
Most have modern surfaces.
Many were immediately provisionalized and
loaded with cement retained restorations. In
many cases the cement extended down to
the boney levels
v Aninflammatory response was initiated which was
progressive and irreversible leading to extensive
bone loss.
73. Zirconium Implant Fixtures
(Strub et al, 2010)
v Has been promoted for use in the esthetic zone
v Biocompatible
" Histology similar to titanium – about 60% bone implant contact area
" Anchorage is similar to titanium
v Microrough surfaces the best
v Success rates equivalent to titanium
v UV exposure makes the surface more bioreactive
v Fractures
" One piece system – fractures at ¼ the load compared to titanium
" Two piece systems fracture at 1/6th the load compared to titanium
" Alumina reinforced zirconium is stronger
Not ready for clinical use. Some people believe that zirconium
implants will eventually disappear from the market.
74. Zirconium abutments and frameworks
Used in the esthetic zone
Abutments
l Less plague adherence
l More esthetic
l Higher fracture rate
Frameworks
l High incidence of chipping of porcelain
off the zirconium frameworks
l Not recommended for posterior teeth
Courtesy Dr. A. Sharma
75. v Visitffofr.org for hundreds of additional lectures
on Complete Dentures, Implant Dentistry,
Removable Partial Dentures, Esthetic Dentistry
and Maxillofacial Prosthetics.
v The lectures are free.
v Our objective is to create the best and most
comprehensive online programs of instruction in
Prosthodontics