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 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.
This document discusses concepts of complete denture occlusion including the differences between natural dentition and dentures, goals of denture occlusion, types of occlusion including bilateral balance and neutrocentric, and factors affecting occlusal balance. It also covers posterior tooth forms, balancing occlusion, and lingualized occlusion.
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 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.
This document discusses concepts of complete denture occlusion including the differences between natural dentition and dentures, goals of denture occlusion, types of occlusion including bilateral balance and neutrocentric, and factors affecting occlusal balance. It also covers posterior tooth forms, balancing occlusion, and lingualized occlusion.
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
The document discusses setting up teeth for a balanced occlusion in a complete denture. It describes placing an anterior-posterior curve in the maxillary arch and a slight curve from side to side in the mandibular arch. It provides details on positioning each individual tooth, including landmarks to use and desired angulations, overlaps, and relationships between opposing teeth. The goal is to create a balanced occlusion that provides stability and proper function during speech and jaw movements.
This document provides instructions for fabricating custom impression trays using either light cure resin or tray resin. It describes how to mark registration lines on casts, block out undercut areas, adapt the resin materials, and trim the trays. Completed trays should have rounded, smooth edges of proper thickness and extension, with finger rests and handles as needed.
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.
The document discusses five factors that affect occlusal balance: condylar inclination, occlusal plane inclination, incisal guidance, cuspal inclination, and compensating curve. It explains that maintaining a balanced occlusion requires balancing these factors using Theilman's formula. If one factor such as incisal guidance is increased, another such as the compensating curve must also be increased to prevent posterior disclusion. Minimizing incisal guidance in complete dentures can help minimize imbalanced tipping forces.
This document provides instructions for making final impressions for complete dentures. It discusses:
- The objectives of final impressions including preservation of tissue and bone, support, stability, and retention.
- Techniques for recording tissues at rest to avoid displacement and damage, including selective pressure and border molding.
- Steps for making custom trays including design, tray materials, and border molding sequences.
- Considerations for final maxillary impressions including mobile tissues, tori, and seal areas.
- Selection and application of impression materials to achieve an accurate final impression.
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.
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 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 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.
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.
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.
This document contains a lecture by Dr. Charles Goodacre on the importance of cervical contour, marginal fit, and surface smoothness of dental restorations for optimal gingival health. Over several decades of practice, Dr. Goodacre observed many cases where poor contours, fit or smoothness led to gingival inflammation and tissue loss. The lecture reviews key principles for contouring provisional and definitive restorations, and highlights cases with favorable as well as unfavorable outcomes related to restoration design. Dr. Goodacre emphasizes the importance of biologic principles and attention to detail for achieving and maintaining healthy peri-implant and periodontal tissues.
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. Digital impressions involve directly scanning teeth or an indirect scan of a dental cast. Custom trays are often used to carry and confine impression materials. Trays should be rigid, dimensionally stable, and provide adequate space for materials. The document outlines techniques for fabricating custom trays using autopolymerizing or light-cured resin. Good impressions accurately record all prepared surfaces
This document discusses techniques for fluid control and tissue management during fixed prosthodontic impressions. It begins by explaining the importance of fluid control to obtain an accurate impression and lists various methods for fluid control like retraction cords, cotton rolls, and suction. Next, it describes different types of retraction cords and instruments used to displace tissues and examines their purposes. It then provides details on the speaker's preferred technique using two different sized cords and hemostatic agents to minimize trauma during impression making. In summary, this document outlines best practices for fluid control and tissue retraction to obtain high quality fixed prosthodontic impressions.
This document provides guidelines for tooth preparation for complete metal crowns. It discusses advantages like maximum retention and resistance form, as well as disadvantages like requiring more tooth reduction. Ideal preparation includes a 0.3-0.5mm chamfer finish line and 10-20 degrees of axial wall convergence. Occlusal reduction should be 1.0-1.5mm. Additional grooves may enhance resistance for teeth with limited dimensions. Line angles should be rounded to prevent casting defects. Examples demonstrate preparation steps and required modifications for fixed partial dentures.
This document discusses guidelines for clinical shade selection, including recommendations for lighting, selection time, patient positioning, tooth condition, selection distance, and use of digital images. It provides details on:
- Using daylight-balanced lighting with a CRI over 90 for optimal color matching
- Allowing sufficient time for multiple shade selections to avoid eye fatigue
- Positioning the patient upright at eye level for natural viewing of teeth
- Ensuring clean, dry tooth surfaces isolated with a rubber dam
- Comparing shades at a distance of 1-2 feet to evaluate value more easily
- Using digital images and diagrams to document shade zones and characteristics for the technician.
More from www.ffofr.org - Foundation for Oral Facial Rehabilitiation (20)
31. 观测主模型,决定RPD
就位道(MAP),三点
标记模型
依照MAP,完成全轮廓的蜡型。确定咬合(排列临牙和对牙合牙)
导平面和支托应当设计在金属上
Maximize guide plane
height and width to Survey for tissue undercuts on Positive cingulum
optimize stability a solid model to aid in retainer rest
design
完成PEM修复体的蜡型回切。尽量扩大导平面的高度和宽度从而增进
RPD的稳定性,确保支托是正性的。
63. 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.
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Prosthodontics