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
Direct retainers2 / dental implant courses by Indian dental academy 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 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
Direct retainer. /certified fixed orthodontic courses by Indian dental academy Indian dental academy
The document discusses direct retainers for removable partial dentures. It defines direct retainers and describes their classification into intracoronal and extracoronal retainers. Intracoronal retainers include precision attachments within tooth structure, while extracoronal retainers are clasp assemblies outside tooth contours. Circumferential and bar clasps are described as common extracoronal retainers. Requirements for an effective clasp like retention, support, stability and reciprocation are also summarized. Specific clasp designs like simple circlet, reverse circlet, and ring clasps are outlined.
The document discusses the concept of height of contour and how it relates to areas available for retention versus support on teeth. It then discusses survey lines and classifications proposed by Kennedy, Cummer, DeVan, Blatterfein and Ney for determining ideal clasp design based on the survey line. The document outlines the basic parts of a clasp assembly and factors that determine the amount of retention such as undercut size and depth, flexibility of the clasp arm based on its length, diameter, cross-sectional form and material. Ideal clasp design and flexibility varies depending on these factors and the classification of survey line.
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
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.
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.
1. The document discusses different types of direct retainers for removable partial dentures, including intracoronal and extracoronal retainers.
2. Intracoronal retainers are internal attachments inside crowns that provide friction retention, while extracoronal retainers include various clasps that engage external tooth surfaces.
3. Common clasp types are discussed such as circumferential clasps, bar clasps, and modifications like Aker's clasps, embrasure clasps, and RPA clasps that are used in different clinical situations. Design considerations for retention, stability, support, and passivity are covered.
Direct retainers2 / dental implant courses by Indian dental academy 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 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
Direct retainer. /certified fixed orthodontic courses by Indian dental academy Indian dental academy
The document discusses direct retainers for removable partial dentures. It defines direct retainers and describes their classification into intracoronal and extracoronal retainers. Intracoronal retainers include precision attachments within tooth structure, while extracoronal retainers are clasp assemblies outside tooth contours. Circumferential and bar clasps are described as common extracoronal retainers. Requirements for an effective clasp like retention, support, stability and reciprocation are also summarized. Specific clasp designs like simple circlet, reverse circlet, and ring clasps are outlined.
The document discusses the concept of height of contour and how it relates to areas available for retention versus support on teeth. It then discusses survey lines and classifications proposed by Kennedy, Cummer, DeVan, Blatterfein and Ney for determining ideal clasp design based on the survey line. The document outlines the basic parts of a clasp assembly and factors that determine the amount of retention such as undercut size and depth, flexibility of the clasp arm based on its length, diameter, cross-sectional form and material. Ideal clasp design and flexibility varies depending on these factors and the classification of survey line.
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
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.
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.
1. The document discusses different types of direct retainers for removable partial dentures, including intracoronal and extracoronal retainers.
2. Intracoronal retainers are internal attachments inside crowns that provide friction retention, while extracoronal retainers include various clasps that engage external tooth surfaces.
3. Common clasp types are discussed such as circumferential clasps, bar clasps, and modifications like Aker's clasps, embrasure clasps, and RPA clasps that are used in different clinical situations. Design considerations for retention, stability, support, and passivity are covered.
The document discusses various types of clasps used for retention in removable partial dentures, including their design, parts, placement and advantages. It describes circumferential, bar, and combination clasps, noting factors like flexibility, coverage of tooth structure, and ability to engage undercuts that determine appropriate use. Proper clasp design and placement is important to resist forces while minimizing risks to abutment teeth and surrounding tissue.
Direct retainers in prosthodontics /certified fixed orthodontic courses by In...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.
Dental Clasp designs 1 /certified fixed orthodontic courses by Indian dental ...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.
Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
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
This document discusses different types of direct retainers for removable partial dentures, including intracoronal and extracoronal retainers. It describes various extracoronal clasp designs such as circlet, half and half, fish hook, reverse circlet, and embrasure clasps. Key factors that determine clasp retention like flexibility, diameter, and metal composition are also summarized. Guidelines for proper clasp design and factors influencing selection are provided.
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
This document discusses direct retainers for removable partial dentures. It describes the two basic types of direct retainers: intracoronal and extracoronal retainers. Intracoronal retainers are cast entirely within the contours of an abutment tooth while extracoronal retainers use components placed on or attached to the external surfaces of abutment teeth, such as circumferential clasps or bars. The document also covers principles of clasp design and the use of a dental cast surveyor to identify areas of a tooth that can provide retention and stabilization.
Direct retainer/ course in dentistry/ cosmetic dentistry trainingIndian dental academy
This document discusses direct retainers for removable partial dentures. It describes different types of direct retainers including intracoronal and extracoronal retainers. Intracoronal retainers include precision attachments and semi-precision attachments that reside inside the tooth. Extracoronal retainers include clasp assemblies and attachments that reside outside the tooth. Circumferential and bar clasps are described as common types of clasp assemblies. The document outlines the key parts and functions of clasps, including requirements for an effective clasp design.
This document discusses different types of direct retainers used in removable dental prostheses. It describes primary retainers as mechanical components that directly engage abutment teeth, such as clasp assemblies. Clasp assemblies provide retention through encirclement of teeth and contacting in three areas - the occlusal rest, retentive clasp terminal, and reciprocal clasp terminal. The document also discusses factors that influence clasp retention such as flexibility, taper, length and diameter.
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
This document discusses various types of clasps used for removable partial dentures and their design considerations. It describes intracoronal and extracoronal attachments as well as different clasp designs like Akers clasps, circumferential clasps, and back action clasps. Factors that influence clasp retention like undercut depth and shape are covered. Design principles for survey lines and preventing torquing forces on teeth with free-end saddles are also summarized.
Direct retainer, designing consideration, requirements, indications
part 1 deals with designig principles and requirements of retainers.
part 2 deals with types of retainers and their specific condition
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.
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.
This document provides an overview of direct retainers used in removable partial dentures. It begins with an introduction to direct retention and defines direct retainers. It then classifies direct retainers as either intracoronal or extracoronal. Intracoronal retainers are further divided into precision and semi-precision attachments, while extracoronal retainers include retentive clasp assemblies. The document discusses the requirements of clasp assemblies including retention, support, stability, reciprocation, encirclement, and passivity. It describes the components of clasp assemblies including rests, bodies, retentive arms, shoulders, and reciprocal arms. In closing, the document emphasizes that clasp assembly selection must consider multiple factors to provide adequate
Direct retainers in removable partial denturesShebin Abraham
This document discusses direct retainers used in removable partial dentures. It defines direct retainers as components that retain and prevent dislodgment of the prosthesis. Direct retainers are classified as either intracoronal or extracoronal and include precision attachments, semi-precision attachments, and retentive clasp assemblies. Extracoronal attachments include circumferential clasps and bar clasps. The basic parts of clasp assemblies are described, and principles of clasp design such as retention, stability, support, reciprocation, and encirclement are explained. Factors that influence the amount of retention provided by clasps are also outlined.
Terminologies in rpd/certified fixed orthodontic courses by Indian dental aca...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 various types of clasps used for retention in removable partial dentures, including their design, parts, placement and advantages. It describes circumferential, bar, and combination clasps, noting factors like flexibility, coverage of tooth structure, and ability to engage undercuts that determine appropriate use. Proper clasp design and placement is important to resist forces while minimizing risks to abutment teeth and surrounding tissue.
Direct retainers in prosthodontics /certified fixed orthodontic courses by In...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.
Dental Clasp designs 1 /certified fixed orthodontic courses by Indian dental ...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.
Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
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
This document discusses different types of direct retainers for removable partial dentures, including intracoronal and extracoronal retainers. It describes various extracoronal clasp designs such as circlet, half and half, fish hook, reverse circlet, and embrasure clasps. Key factors that determine clasp retention like flexibility, diameter, and metal composition are also summarized. Guidelines for proper clasp design and factors influencing selection are provided.
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
This document discusses direct retainers for removable partial dentures. It describes the two basic types of direct retainers: intracoronal and extracoronal retainers. Intracoronal retainers are cast entirely within the contours of an abutment tooth while extracoronal retainers use components placed on or attached to the external surfaces of abutment teeth, such as circumferential clasps or bars. The document also covers principles of clasp design and the use of a dental cast surveyor to identify areas of a tooth that can provide retention and stabilization.
Direct retainer/ course in dentistry/ cosmetic dentistry trainingIndian dental academy
This document discusses direct retainers for removable partial dentures. It describes different types of direct retainers including intracoronal and extracoronal retainers. Intracoronal retainers include precision attachments and semi-precision attachments that reside inside the tooth. Extracoronal retainers include clasp assemblies and attachments that reside outside the tooth. Circumferential and bar clasps are described as common types of clasp assemblies. The document outlines the key parts and functions of clasps, including requirements for an effective clasp design.
This document discusses different types of direct retainers used in removable dental prostheses. It describes primary retainers as mechanical components that directly engage abutment teeth, such as clasp assemblies. Clasp assemblies provide retention through encirclement of teeth and contacting in three areas - the occlusal rest, retentive clasp terminal, and reciprocal clasp terminal. The document also discusses factors that influence clasp retention such as flexibility, taper, length and diameter.
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
This document discusses various types of clasps used for removable partial dentures and their design considerations. It describes intracoronal and extracoronal attachments as well as different clasp designs like Akers clasps, circumferential clasps, and back action clasps. Factors that influence clasp retention like undercut depth and shape are covered. Design principles for survey lines and preventing torquing forces on teeth with free-end saddles are also summarized.
Direct retainer, designing consideration, requirements, indications
part 1 deals with designig principles and requirements of retainers.
part 2 deals with types of retainers and their specific condition
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.
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.
This document provides an overview of direct retainers used in removable partial dentures. It begins with an introduction to direct retention and defines direct retainers. It then classifies direct retainers as either intracoronal or extracoronal. Intracoronal retainers are further divided into precision and semi-precision attachments, while extracoronal retainers include retentive clasp assemblies. The document discusses the requirements of clasp assemblies including retention, support, stability, reciprocation, encirclement, and passivity. It describes the components of clasp assemblies including rests, bodies, retentive arms, shoulders, and reciprocal arms. In closing, the document emphasizes that clasp assembly selection must consider multiple factors to provide adequate
Direct retainers in removable partial denturesShebin Abraham
This document discusses direct retainers used in removable partial dentures. It defines direct retainers as components that retain and prevent dislodgment of the prosthesis. Direct retainers are classified as either intracoronal or extracoronal and include precision attachments, semi-precision attachments, and retentive clasp assemblies. Extracoronal attachments include circumferential clasps and bar clasps. The basic parts of clasp assemblies are described, and principles of clasp design such as retention, stability, support, reciprocation, and encirclement are explained. Factors that influence the amount of retention provided by clasps are also outlined.
Terminologies in rpd/certified fixed orthodontic courses by Indian dental aca...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
Removable partial denture design clasp selection according to the position ...Mohammad Ayham Hakkoum
This presentation is about important topic in dentistry/removable prosthodontics.
It talk about removable partial denture design related to clasp selection in distal extension cases according to the position of retentive undercut.
Retainers are agreements that establish ongoing website maintenance and support for a set fee over a certain period of time, usually monthly. They provide value through regular communication and a clear scope of work that prioritizes tasks within the agreed upon time period. To be successful, retainers require building relationships, negotiating as partners, invoicing on time, and controlling conversations to ensure all client and contractor needs and expectations are met.
Description :
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
Retention of maxillofacial prosthesis/cosmetic dentistry coursesIndian 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
This document provides an overview of prosthodontic procedures including removable partial dentures, removable complete dentures, and fixed partial dentures. It lists the main materials used in these procedures such as plastic, porcelain, and metal, and provides examples of single tooth crowns and bridges that are fixed or cemented.
An immediate denture is a removable denture that is fabricated and inserted on the same day as tooth extractions. There are two types: a conventional immediate denture, where posterior teeth are extracted first to allow healing before removing anterior teeth and relining the denture; and an interim immediate denture, where all teeth are extracted at once and a second new denture is fabricated after healing. Immediate dentures can help maintain appearance and jaw function after tooth loss but may be less retentive initially than traditional dentures due to ridge changes during healing.
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 outlines the process for diagnosing and creating a treatment plan for a patient requiring a complete or removable partial denture. It details the steps involved in examining the patient which includes reviewing their medical and dental history, examining the mouth externally and internally, and taking radiographs. The treatment plan phase involves addressing issues like pain, extractions, and surgery before finalizing and delivering the denture.
This 3 slide presentation provides information on examination, diagnosis and treatment planning for removable partial dentures. It is part of a 4th year dental course on prosthodontics and refers to a color atlas textbook as a reference. The presentation was given by Dr. Ali Hmud at the College of Dentistry in Dammam, Saudi Arabia on Sunday, April 8, 2008.
The document discusses complete denture impressions. It begins with an introduction stating there has been disagreement over impression procedures since 1850 due to many being developed empirically. It then defines key terms like impression, preliminary impression, final impression, and impression material.
The document reviews the literature on impression techniques dating back to the 18th century. It discusses early methods and materials used like beeswax, gutta percha, plaster of paris, and zinc oxide eugenol. The mucous membrane anatomy is explained. Biological considerations for maxillary and mandibular impressions are provided, highlighting important anatomical landmarks and structures.
this ppt will give you complete in depth information about how establish occlusion removable partial dentures. we have got residentila courses for prosthodontics where in complete training will be provided on patient
An immediate denture is a complete or partial denture fabricated at the time of tooth extraction. Immediate dentures can help maintain appearance, jaw relationships, and nutrition after tooth loss. However, they are more challenging to fabricate than conventional dentures due to less space and potential instability from recent extractions. There are two main types: conventional immediate dentures are intended for long-term use after relining, while interim immediate dentures act as a short-term prosthesis until a second denture can be fabricated once healing is complete. Immediate dentures require follow-up relines and adjustments as the post-extraction site heals.
Removable appliances in orthodontics /certified fixed orthodontic courses by...Indian dental academy
Welcome to 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.
DIAGNOSTIC SETUP FOR REMOVABLE PARTIAL DENTURE /prosthodontic coursesIndian 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 common complaints of complete denture wearers, including discomfort/pain, looseness, difficulty adapting, altered speech, inability to eat, and issues with appearance. It provides detailed explanations of potential causes for each complaint and recommends treatments such as adjusting the occlusion, relieving pressure areas, improving border extensions, and remaking dentures if needed. The most common problems are reported as pain, looseness due to poor retention, and inability to adapt.
1. There are several materials used for replacing teeth in dentures including acrylic resin, porcelain, metals, and combinations. Acrylic resin teeth are lighter and can be modified more easily but wear down faster. Porcelain teeth have better aesthetics but are more difficult to modify.
2. Teeth can be attached to denture bases using an intermediate layer of acrylic resin, or facings can be cemented to metal backings. New developments allow for direct chemical bonding of acrylic resin teeth to metal frameworks.
3. Tube teeth and metal posts can be used for single tooth replacements when space is limited, though they are not as strong. Reinforced acrylic pontics are a better option
Mouth preparation for removable partial denture/ dental education in indiaIndian 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.
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.
Description :
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
Retention of maxillofacial prosthesis./cosmetic dentistry courseIndian 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.
Direct retrainers /orthodontic courses by Indian dental academy 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
Removable orthodontic appliances can be inserted and removed by the patient. They were first developed in the 1830s using plaster models. Key advantages are that they allow for oral hygiene and are less expensive than fixed appliances. However, they have less control over tooth movement and require patient cooperation. Removable appliances use components like clasps for retention and bows or springs for applying forces. Common clasps include Adams, Jackson's, and circumferential clasps which engage tooth undercuts. Guidelines for appliance activation include providing paths for tooth movement and minimizing tipping.
Removable orthodontic appliances can be inserted and removed by the patient. They were first developed in the 1830s using plaster models. Key advantages are that they allow for oral hygiene and are less expensive than fixed appliances. However, they have less control over tooth movement and require patient cooperation. Removable appliances use components like clasps for retention and bows or springs for applying forces. Common clasps include Adams, Jackson's, and circumferential clasps which engage tooth undercuts. Guidelines for appliance activation include allowing space for tooth movement and preventing anchorage loss.
Design consideration in reducing stress in rpd/ oral surgery courses 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
Direct retainers /certified fixed orthodontic courses by Indian dental acad...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.
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
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.
This document discusses different types of direct retainers used in removable partial dentures. It defines direct retention as retention obtained through clasps or attachments contacting the abutment teeth. Intracoronal and extracoronal direct retainers are described. Intracoronal retainers are placed within the normal contours of teeth while extracoronal retainers are placed outside. The most commonly used extracoronal retainer is the clasp, which partially encircles teeth and engages undercuts for retention. Circumferential or Akers clasps completely encircle teeth and engage undercuts. Advantages include excellent support and retention while disadvantages include increased tooth coverage.
Orthodontic brackets are devices that are bonded to teeth to apply corrective forces during orthodontic treatment. Brackets have evolved over time from early crude metal plates to modern pre-adjusted brackets. Key developments include:
- Edward Angle's introduction of the ribbon arch appliance in 1915, which was the first bracket devised.
- His later edgewise appliance in 1925, which featured a rectangular slot and allowed for three planes of tooth movement.
- Modern pre-adjusted brackets like the Roth prescription in 1975 aim to reduce chair time by eliminating complex wire bending through built-in overcorrection values.
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 different types of extracoronal retainers used in removable partial dentures. It defines extracoronal retainers as components that reside entirely outside the normal contours of abutment crowns and derive retention from closely fitting parts. It then describes 10 common types of extracoronal retainers, including their components, advantages, disadvantages, and indications for use.
This document discusses various methods of retention for maxillofacial prosthetics. It begins with a brief history of maxillofacial prosthetics from ancient Egypt to modern times. It then covers different types of anatomic retention including intraoral considerations like support from residual structures and extraoral considerations. The document also discusses various methods of mechanical retention such as cast clasps, attachments, adhesives, and implants that can be used to improve retention of maxillofacial prosthetics.
Self ligating brackets /certified fixed orthodontic courses by Indian dental ...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.
Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
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 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
Similar to Direct retainer/ oral surgery courses (19)
Opportunity for Dentists (BDS/MDS )to relocate to United kingdom -Register as a DENTAL HYGIENIST/ DENTAL THERAPIST without Board exams and after approval you can register in GDC as a DH/DT and start working as a DH/DT Immediately and get paid.
You can complete the whole process in 3-4 months.Salary range for DH/DT is around 2500-3500 Pounds per month.
Eligibility / requirements-
1. An International English Language Testing System (IELTS) certificate
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1ST, 2ND AND 3RD ORDER BENDS IN STANDARD EDGEWISE APPLIANCE SYSTEM /Fixed ort...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
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Dear Doctor,
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Thanks & Regards
Indian Dental Academy
--
Indian Dental Academy
Leader in continuing dental education
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skype:indiandentalacademy
+919248678078
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
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This document discusses dental occlusion concepts and philosophies for complete dentures. It introduces key terms like physiologic occlusion and defines different occlusion schemes like balanced articulation and monoplane articulation. The document discusses advantages and disadvantages of using anatomic versus non-anatomic teeth for complete dentures. It also outlines requirements for maintaining denture stability, such as balanced occlusal contacts and control of horizontal forces. The goal of occlusion for complete dentures is to re-establish the homeostasis of the masticatory system disrupted by edentulism.
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This document discusses dental casting investment materials. It describes the three main types of investments - gypsum bonded, phosphate bonded, and ethyl silicate bonded investments. For gypsum bonded investments specifically, it details their classification, composition including the roles of gypsum, silica, and modifiers, setting time, normal and hygroscopic setting expansion, and thermal expansion. It provides information on how the properties of gypsum bonded investments are affected by their composition. The document serves as a comprehensive overview of dental casting investment materials.
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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
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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
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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
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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
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This document provides an overview of wound healing, its functions, stages, mechanisms, factors affecting it, and complications.
A wound is a break in the integrity of the skin or tissues, which may be associated with disruption of the structure and function.
Healing is the body’s response to injury in an attempt to restore normal structure and functions.
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There are 4 phases of wound healing: hemostasis, inflammation, proliferation, and remodeling. This document also describes the mechanism of wound healing. Factors that affect healing include infection, uncontrolled diabetes, poor nutrition, age, anemia, the presence of foreign bodies, etc.
Complications of wound healing like infection, hyperpigmentation of scar, contractures, and keloid formation.
Level 3 NCEA - NZ: A Nation In the Making 1872 - 1900 SML.pptHenry Hollis
The History of NZ 1870-1900.
Making of a Nation.
From the NZ Wars to Liberals,
Richard Seddon, George Grey,
Social Laboratory, New Zealand,
Confiscations, Kotahitanga, Kingitanga, Parliament, Suffrage, Repudiation, Economic Change, Agriculture, Gold Mining, Timber, Flax, Sheep, Dairying,
Chapter wise All Notes of First year Basic Civil Engineering.pptxDenish Jangid
Chapter wise All Notes of First year Basic Civil Engineering
Syllabus
Chapter-1
Introduction to objective, scope and outcome the subject
Chapter 2
Introduction: Scope and Specialization of Civil Engineering, Role of civil Engineer in Society, Impact of infrastructural development on economy of country.
Chapter 3
Surveying: Object Principles & Types of Surveying; Site Plans, Plans & Maps; Scales & Unit of different Measurements.
Linear Measurements: Instruments used. Linear Measurement by Tape, Ranging out Survey Lines and overcoming Obstructions; Measurements on sloping ground; Tape corrections, conventional symbols. Angular Measurements: Instruments used; Introduction to Compass Surveying, Bearings and Longitude & Latitude of a Line, Introduction to total station.
Levelling: Instrument used Object of levelling, Methods of levelling in brief, and Contour maps.
Chapter 4
Buildings: Selection of site for Buildings, Layout of Building Plan, Types of buildings, Plinth area, carpet area, floor space index, Introduction to building byelaws, concept of sun light & ventilation. Components of Buildings & their functions, Basic concept of R.C.C., Introduction to types of foundation
Chapter 5
Transportation: Introduction to Transportation Engineering; Traffic and Road Safety: Types and Characteristics of Various Modes of Transportation; Various Road Traffic Signs, Causes of Accidents and Road Safety Measures.
Chapter 6
Environmental Engineering: Environmental Pollution, Environmental Acts and Regulations, Functional Concepts of Ecology, Basics of Species, Biodiversity, Ecosystem, Hydrological Cycle; Chemical Cycles: Carbon, Nitrogen & Phosphorus; Energy Flow in Ecosystems.
Water Pollution: Water Quality standards, Introduction to Treatment & Disposal of Waste Water. Reuse and Saving of Water, Rain Water Harvesting. Solid Waste Management: Classification of Solid Waste, Collection, Transportation and Disposal of Solid. Recycling of Solid Waste: Energy Recovery, Sanitary Landfill, On-Site Sanitation. Air & Noise Pollution: Primary and Secondary air pollutants, Harmful effects of Air Pollution, Control of Air Pollution. . Noise Pollution Harmful Effects of noise pollution, control of noise pollution, Global warming & Climate Change, Ozone depletion, Greenhouse effect
Text Books:
1. Palancharmy, Basic Civil Engineering, McGraw Hill publishers.
2. Satheesh Gopi, Basic Civil Engineering, Pearson Publishers.
3. Ketki Rangwala Dalal, Essentials of Civil Engineering, Charotar Publishing House.
4. BCP, Surveying volume 1
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In this webinar, participants learned how to utilize Generative AI to streamline operations and elevate member engagement. Amazon Web Service experts provided a customer specific use cases and dived into low/no-code tools that are quick and easy to deploy through Amazon Web Service (AWS.)
2. DIRECT RETAINERS
Introduction
The removable partial denture must have
sufficient retention to resist reasonable dislodging
forces.
Primary Retention: for the removable partial denture
is accomplished mechanically by placing retaining
elements on the abutment teeth.
Secondary Retention: is provided by the intimate
relationship of minor connector contact with the guiding
planes, denture bases, and major connectors
(maxillary) with underlying tissues.
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3. Definition: A direct retainer is any unit of removable
dental prosthesis that engages an abutment tooth in
such a manner as to resist displacement of the
prosthesis away from basal seat tissues.
The two basic types of direct retainers:
Intracoronal retainer
Direct Retainers (precision attachment)
Extracoronal Retainer
(clasp)
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4. Intracoronal Retainers: which is cast or attached
totally within the restored natural contours of an
abutment tooth. This type of retainer is composed of
a prefabricated machined key and keyway, with
opposing vertical parallel walls that serve to limit
movement and resist removal of the partial denture
through frictional resistance.
Extracoronal Retainers: which uses mechanical
resistance to displacement by components placed on
or attached to the external surfaces of an abutment
tooth
Extracoronal D.R. Circumferential clasp
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5. Components of clasp Assembly
1. Rest – Provides support for prosthesis
2. Body – Connects rest and clasp arms to
minor connector
3. Reciprocal arm – must be rigid above the
height of contour
4. Retentive arm – Provides direct retention
below the height of the contour
5. Shoulder
6. Approach arm
7. Terminal
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6. a. The occlusal
rest
b. The body
c. The shoulders
d. The terminals
e. The clasp arms
f. The strut
g. the approach
arm
h. the terminal
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7. Clasps can be classified on the basis of
construction
1. Cast clasp
2. Wrought wire clasp
3. Combination clasp
Clasps classified on a basis of design
1. Circumferential clasp (Akers –
suprabulge)
2. Bar clasp (vertical projection – Roach
infrabulge)
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8. Circumferential clasp: It approaches the
undercut from occlusal direction – “pull” type of
retention
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9. Bar clasp: Retentive terminal approaches the
undercut from gingival direction – below the
surveyline – “push” type of retention.
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11. ATTRIBUTES OF PROPERLY
DESIGNED CLASP
The clasp should possess the attributes
of
Retention
Stabilization
Support
Encirclement
Reciprocity
Passivity
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12. RETENTION
Retention is the property which enables the clasp to
resist dislodgement from the tooth in an occlusal
direction. A dislodging force may be activated by
speech, muscle action, mastication, deglutition,
sticky foods, or gravity.
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13. Retentive arm of the clasp
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14. The length of the clasp arm. The greater the length,
the greater the resiliency.
The diameter of the retentive arm. The smaller the
diameter, greater the resiliency.
The cross sectional form. A round clasp arm is more
resilient than one that is half round or oval in shape.
The taper. Proper taper can increase flexibility as
much as fourfold. The retentive arm of the clasp
should taper evenly and uniformly from its origin at
the body of the clasp to its terminal extremity.
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15. The kind of alloy. The chromium Cobalt alloys have a
higher modulus of elasticity, hence are not as
resilient as gold alloys of the same diameter.
The type of alloy. An alloy is wrought form is more
resilient than the same alloy of identical diameter in
cast form, because of its internal structure.
Heat treatment of the alloy. Proper heat treatment,
gold in particular, will increase the resilience
substantially, whereas improper heat treatment may
render it brittle and with no resilience whatever.
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16. Cast Clasp Wrought clasp
Flex in
horizontal
plane
Flex in
all
planes
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17. Flexibility of a clasp arm increases
as length of clasp increases
Uniform taper in both
thickness and width
necessary
Clasp terminal should be
half as thick as origin
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18. STABILIZATION
Stabilization, or bracing is the resistance which
the clasp contributes to displacement of the
prosthesis in horizontal plane . All of the clasp
components, with the exception of the retentive
terminal, contribute this property in varying
degrees.
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19. SUPPORT
Support is the property of the clasp which
enables it to resist displacement in a gingival
direction. The occlusal rest is the prime support
unit of the clasp, although the body and the
shoulder of the clasp, positioned as they are
above the greatest diameter of the tooth, also
contribute a substantial amount of support.
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20. ENCIRCLEMENT
The clasp should be so designed that it encircles at
least 180 degrees of the crown of the tooth, to
preclude movement of the tooth out of the clasp arms
as strmsses are applied.
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21. Each clasp assembly
must encircles
more than 1800
A clasp that fails to
produce encirclement
will act as orthodontic
appliance
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22. RECIPROCITY
• Reciprocation may defined as “ the means by
which one part of the appliance is made to
counter the effect created by another part”.
• Reciprocation is needed most when the
retentive terminal flexes over the bulge of the
crown during insertion and removal of the
prosthesis.
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23. Reciprocal arm of the clasp is rigid.
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24. PASSIVITY
When the clasp is in place on the tooth, it should be
passive. Passivity is an important requirement of a
properly designed clasp. A clasp so designed will
permit a slight degree of movement of the base
without transmitting any appreciable amount of the
stress to the abutment tooth.
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25. A clasp must be completely seated to be passive
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28. SIMPLE CIRCLET CLASP
This is the most widely used clasp
It is the clasp of choice on tooth supported
removal partial dentures
This clasp approaches the undercut on the
abutment tooth from the edentulous areas and
engages the undercut from the edentulous
space.
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31. SIMPLE CIRCLET CLASP
Advantages:
• The clasp fulfills the requirement of support,
stability reciprocation, encirclement & passivity
better than any other type of clasp.
• It is easy to construct.
• It is simple to repair.
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32. SIMPLE CIRCLET CLASP
Disadvantages:
• It tends to increase the circumference of the crown.
• In anterior part of the mouth is not acceptable.
• It covers more tooth surface then the bar clasp and
prone to caries.
• Retentive undercuts on some teeth are difficult to
reach with retentive terminal of the claspwww.indiandentalacademy.comwww.indiandentalacademy.com
33. REVERSE CIRCLET CLASP
Reverse circlet clasp is used when the retentive
undercut is located on the surface of the
abutment tooth adjacent to the edentulous
space.
In distal extension edentulous ridge partial
denture the reverse approach clasp helps to
control the stresses transmitted to the terminal
abutment tooth on the edentulous side.
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35. MULTIPLE CIRCLET CLASP
It is opposing simple circlet
clasps joined at the
terminal end of the 2
reciprocal arms.
It is indicated in
periodontally weakened
teeth.
This is the form of splinting
weakened teeth by a
removable partial denture.www.indiandentalacademy.comwww.indiandentalacademy.com
36. EMBRASURE CLASP
(MODIFIED Crib Clasp)
The embrassure clasp is 2 simple circlet clasps
joined at the body.
It is most frequently used on the side of the
arch where there is no edentulous space.
Occlusal rest preparations must be made on
both teeth and tooth structure must be removed
from the buccal inclines of both teeth to provide
space for adequate thickness of metal.
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39. RING CLASP
Indicated on tipped molars.
Ring clasp engages the undercut by encircling
the entire tooth from its point of origin.
On mandibular molar the clasp encircles the
tooth beginning on the mesio-buccal surface
and eliminating in an infrabulge area on the
mesio-lingual surface.
On a maxillary molar the direct of the clasp is
reversed.
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42. The entire clasp must be placed above the left
of the contours except retentive tip.
It must be designed with additional support in
the form of an auxillary bracing arm.
An additional occlusal rest on the opposite side
of the tooth from the clasp origin provide
additional support and proved further movement
of the mesially inclined tooth.
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43. C clasp Fishhook, or Hairpin Clasp
The C clasp is a simple circlet clasp in which the retentive
arm crosses the facial surface of the tooth from its point of
origin, loops back in hairpin turn to engage a proximal
undercut below its point of origin.
The upper part of retentive arm must be rigid, the lower
apart of the retentive arm should be tapered. It is the only
flexible part of the clasp arm.
The crown of the abutment tooth must have sufficient
occlusogingival height to accommodate this double width
of the clasp arm.
The upper and lower arms of the retentive clasp must be
designed such that food debris will not be retained.www.indiandentalacademy.comwww.indiandentalacademy.com
44. C Clasp, Hairpin Clasp, Fishhook
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45. Indications:
When the retentive clasp must engage an
undercut adjacent to the occlusal rest or
edentulous space and a soft tissue undercut
precludes the use of of a bar clasp
The C Clasp is indicated when the reverse
circlet clasp cannot be used because of lack of
occlusal space.
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46. Disadvantages:
The clasp covers a considerable amount of
tooth structure, which may trap food debris.
It is not good choice for a young patient or one
who is prone to caries, and it is often
unacceptable esthetically, particularly on
premolar teeth.
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47. ONLAY CLASP
The onlay clasp is an extended occlusal rest with
buccal and lingual clasp arms.
The clasp may originate from any point on the onlay
that will not create occlusal interferences.
This clasp is generally indicated when the occlusal
surface of the abutment tooth is below the occlusal
plane, usually as a result of the tooth being tipped or
rotated.
The onlay is used to restore the normal occlusalwww.indiandentalacademy.comwww.indiandentalacademy.com
49. COMBINATION CLASP
The combination clasp consists of a Wrought wire
retentive clasp arm and a cast reciprocal clasp arm.
The cast reciprocal arm is normally a circumferential
clasp. But a bar clasp may be used.
The Wrought wire retentive arm is a circumferential
clasp arm.
It is used when maximum flexibility is required.
Esthetics advantage because Wrought structure in
smaller diameter than the cast clasp.www.indiandentalacademy.comwww.indiandentalacademy.com
51. Advantages:
Flexibility.
Adjustability.
Appearance of the Wrought wire retentive arm.
Minimum of tooth surface covered.
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52. Disadvantages:
It involves extra steps in fabrication.
It may be distorted by patient.
It may be less accurately adapted.
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54. Bar or Vertical Project Clasp
Bar clasps approach the undercut from a gingival
direction.
It is more effective than the “pull” retention
characteristic of circumferential clasps.
Patient in contouring less difficulty inserting and
more difficulty in removing removable partial
denture with bar clasp than with circumferential
clasp.
Flexibility of the bar clasp can be controlled by the
taper and length of the approach arm.
Because of the gingival approach of the bar clasp
it is usually esthetics than a circumferential clasp.
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56. DISADVANTAGES
Greater binding to collect and hold food debris
Because of the increased flexibility of the
retentive arm it does not contribute to
stabilization.
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57. T - BAR CLASP
T Bar clasp is frequently used on distal
extension ridge where the usual undercut
.
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59. I-bar clasp
Used on distobuccal surface of maxillary
canines for esthetic reasons.
Retentive tip is in contact with abutment teeth.
I bar is a component of a partial denture
referred to as RPI concept.
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62. Y- BAR CLASP
Y-Bar is basically a T-clasp its configuration
occurs where the it is contour on the facial
surface of the abutment tooth is high on the
medial and distal angles.
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65. REVIEW OF LITERATUREREVIEW OF LITERATURE
I. David n. Firtell, in his review article stated thatI. David n. Firtell, in his review article stated that
Applegate listed 4 factors which determines theApplegate listed 4 factors which determines the
amount retentionamount retention
Angle of infrabulge convergenceAngle of infrabulge convergence
1.1. Distance below height of contourDistance below height of contour
2.2. Accuracy of adaptation to the contacting surfaceAccuracy of adaptation to the contacting surface
3.3. Flexibility of the clasp arm.Flexibility of the clasp arm.
Stone showed experimentally that a properly adaptedStone showed experimentally that a properly adapted
infrabulge clasp could deliverinfrabulge clasp could deliver
143 % more retention than a suprabulge clasp143 % more retention than a suprabulge clasp
According to Mc Cracken the clasp with a roundAccording to Mc Cracken the clasp with a round
wought wire retentive arm to be the best.wought wire retentive arm to be the best.
JPD :VOL 20 NO-1 1968JPD :VOL 20 NO-1 1968
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66. II. Bert T.Cecconi in his review article “THEII. Bert T.Cecconi in his review article “THE
EFFECT OF PARTIAL DENTURE CLASPEFFECT OF PARTIAL DENTURE CLASP
DESIGN ON ABUTMENT TOOTH MOVEMENTDESIGN ON ABUTMENT TOOTH MOVEMENT
“ stated that Clayton measured clasp forces“ stated that Clayton measured clasp forces
exerted on the abutment teeth, he concludedexerted on the abutment teeth, he concluded
that wrought wire clasps exerted more force onthat wrought wire clasps exerted more force on
abutment teeth than the cast bar clasps of sameabutment teeth than the cast bar clasps of same
length.length.
JPD VOL 25,NO 1 1971JPD VOL 25,NO 1 1971
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67. GENE A. ZACHGENE A. ZACH stated that in constructing a distalstated that in constructing a distal
extension RPD, a system of design using mesial restsextension RPD, a system of design using mesial rests
has certain advantages over a system of design usinghas certain advantages over a system of design using
distal rests.distal rests.
JPD 1975 VOL 33 NO 1JPD 1975 VOL 33 NO 1
Advantages:Advantages:
1.1. axis of rotationaxis of rotation
2.2. trauma to tissue distal to abutment teeth.trauma to tissue distal to abutment teeth.
3.3. indirect retention with mesial and distal restsindirect retention with mesial and distal rests
4.4. mesial rests in conjugation with guiding planesmesial rests in conjugation with guiding planes
5.5. assistance to distal displacementassistance to distal displacement
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68. Axis of rotation:Axis of rotation:
A mesial rest results in an axis of rotationA mesial rest results in an axis of rotation
that is more anterior with the dental archthat is more anterior with the dental arch
than is the axis of rotation resulting form athan is the axis of rotation resulting form a
distal rest. This position of the axis ofdistal rest. This position of the axis of
rotation causes the reduction of therotation causes the reduction of the
torquing force applied to the abutmenttorquing force applied to the abutment
tooth during mastication.tooth during mastication.
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69. Trauma to tissue distal to abutmentTrauma to tissue distal to abutment
teeth:teeth:
The use of a mesial rest in the distalThe use of a mesial rest in the distal
extension RPD design results in the lessextension RPD design results in the less
trauma to the soft tissue immediately distaltrauma to the soft tissue immediately distal
to the abutment tooth than results from useto the abutment tooth than results from use
of a distal rest.of a distal rest.
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70. Trauma to tissue distal to abutment teeth:Trauma to tissue distal to abutment teeth:
The use of a mesial rest in the distalThe use of a mesial rest in the distal
extension RPD design results in the lessextension RPD design results in the less
trauma to the soft tissue immediately distal totrauma to the soft tissue immediately distal to
the abutment tooth than results from use of athe abutment tooth than results from use of a
distal rest.distal rest.
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71. Mesial rest in conjugation with guidingMesial rest in conjugation with guiding
planes:planes:
A mesial rest used in conjugation with theA mesial rest used in conjugation with the
guiding plane creates a favourable fulcrumguiding plane creates a favourable fulcrum
point on the abutment tooth that does distalpoint on the abutment tooth that does distal
rest.rest.
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72. Resistance to distal displacement:Resistance to distal displacement:
A system of clasp design using a mesial restA system of clasp design using a mesial rest
with retention located distally on the abutmentwith retention located distally on the abutment
tooth offers more resistance to distaltooth offers more resistance to distal
displacement of a distal extension RPD thandisplacement of a distal extension RPD than
does a system of a clasp design using a distaldoes a system of a clasp design using a distal
rest with retention located mesially on therest with retention located mesially on the
abutment tooth.abutment tooth.
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73. Joseph E. Grasso, in his study, described a new
removable partial denture clasp assembly. A new claps
assembly is presented which incorporates a desirable
feature of both the bar and the circumferential clasp.
With this clasp assembly, the horizontal retentive arm
and the vertical reciprocal arm are designed to make
simultaneous contact with their respective tooth surface
during placement and removal of the prosthesis.
JPD 1980 VOL 43 NO 6
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74. Advantages:
•it improves esthetics
•the survey line doesnot have to be followed in
positioning the nonflexible two ends of the retentive arm
•no special instrumentation is required to make the
lingual surfaces parallel to the path of insertion.
•tooth contact is kept to a minimum
•there is no need to prepare broad parallel tooth surface
to provide reciprocal contacts
•only small contact areas on the lingual surfaces of the
abutment teeth are required for parallelism with the path
of insertion.
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75. David N. FirtellDavid N. Firtell, studied the effect of clasp, studied the effect of clasp
design upon the retention of the removabledesign upon the retention of the removable
partial dentures. He constructed a model topartial dentures. He constructed a model to
represent an ideal removable partial denturerepresent an ideal removable partial denture
situation with standardized undercut, ninesituation with standardized undercut, nine
chrome cobalt alloy test frameworks, eachchrome cobalt alloy test frameworks, each
representing a different clasp design, wererepresenting a different clasp design, were
fabricated according to manufacturersfabricated according to manufacturers
directions. The amount of force required todirections. The amount of force required to
dislodge each framework from the model wasdislodge each framework from the model was
recorded.recorded.
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76. The framework showed the followingThe framework showed the following
decreasing order of resistance to verticaldecreasing order of resistance to vertical
displacement from a 0.02” undercut.displacement from a 0.02” undercut.
1.1. U-shaped infra-bulge claspU-shaped infra-bulge clasp
2.2. Ring claspRing clasp
3.3. Akkers claspAkkers clasp
4.4. Akkers clasp with wrought gold wire retentiveAkkers clasp with wrought gold wire retentive
armarm
5.5. ““I” infra-bulge claspI” infra-bulge clasp
6.6. ““I” infra-bulge clasp with a wrought gold wireI” infra-bulge clasp with a wrought gold wire
retentive armretentive arm
Back action claspBack action claspwww.indiandentalacademy.comwww.indiandentalacademy.com
77. Disadvantages:Disadvantages:
1.1. food entrapmentfood entrapment
2.2. inability of the horizontal retentive arm toinability of the horizontal retentive arm to
provide bracingprovide bracing
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