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Questions and Answers
What is the function of a rest in a removable partial denture?
What is the function of a rest in a removable partial denture?
What is the outline form of an occlusal rest seat?
What is the outline form of an occlusal rest seat?
How should the marginal ridge be lowered for an occlusal rest seat?
How should the marginal ridge be lowered for an occlusal rest seat?
What is the recommended width of an occlusal rest seat for molars and premolars?
What is the recommended width of an occlusal rest seat for molars and premolars?
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Which type of rest is prepared on the lingual surface of a tooth?
Which type of rest is prepared on the lingual surface of a tooth?
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What is the primary function of interproximal occlusal rests in a direct retainer assembly?
What is the primary function of interproximal occlusal rests in a direct retainer assembly?
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What is the advantage of using two adjacent rests rather than a single rest in a direct retainer assembly?
What is the advantage of using two adjacent rests rather than a single rest in a direct retainer assembly?
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What is the purpose of lowering the marginal ridge when preparing an occlusal rest seat?
What is the purpose of lowering the marginal ridge when preparing an occlusal rest seat?
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Why should the form of an internal rest be slightly tapered occlusally and slightly dovetailed?
Why should the form of an internal rest be slightly tapered occlusally and slightly dovetailed?
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What is the purpose of an internal rest in a partial denture?
What is the purpose of an internal rest in a partial denture?
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When preparing an occlusal rest seat, what should be used first to lower the marginal ridge and establish the outline form of the rest seat?
When preparing an occlusal rest seat, what should be used first to lower the marginal ridge and establish the outline form of the rest seat?
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What is the primary requirement for placing rests on sound enamel or on any restoration material?
What is the primary requirement for placing rests on sound enamel or on any restoration material?
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Where are proximal tooth surfaces more vulnerable to caries attack compared to occlusal surfaces?
Where are proximal tooth surfaces more vulnerable to caries attack compared to occlusal surfaces?
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In what restoration material should rest seat preparations be avoided to prevent fracture?
In what restoration material should rest seat preparations be avoided to prevent fracture?
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What should be applied to abutment teeth to reduce the risk of tooth sensitivity and caries formation during rest seat preparation?
What should be applied to abutment teeth to reduce the risk of tooth sensitivity and caries formation during rest seat preparation?
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Study Notes
Function of Rests in Removable Partial Dentures
- Rests provide support for the partial denture framework and help distribute occlusal forces.
- They prevent the denture from moving away from the abutment teeth, maintaining stability.
Outline Form of an Occlusal Rest Seat
- The occlusal rest seat outline is typically round or oval-shaped to conform with the occlusal surface of the tooth.
- It should be designed to accommodate the shape of the opposing dentition.
Lowering the Marginal Ridge for an Occlusal Rest Seat
- The marginal ridge should be lowered by approximately 1.5 to 2 mm to create adequate space for the rest seat.
- This adjustment is crucial for proper seating and function of the denture.
Recommended Width of an Occlusal Rest Seat
- For molars, the recommended width is approximately 2.5 to 3 mm.
- For premolars, the rest seat should be narrower, approximately 2 mm.
Type of Rest on the Lingual Surface of a Tooth
- A lingual rest is prepared on the lingual surface of anterior teeth, often used in partial dentures for better aesthetics and support.
Interproximal Occlusal Rests in Direct Retainer Assemblies
- The primary function is to provide stability and retention to the partial denture, preventing tilting or dislodgement.
Advantage of Two Adjacent Rests
- Utilizing two adjacent rests improves the distribution of forces and enhances the stability and retention of the prosthetic appliance.
Purpose of Lowering the Marginal Ridge
- Lowering the marginal ridge creates adequate space for the rest conforming to physiological requirements and maximizes strength.
Form of an Internal Rest
- The internal rest should be slightly tapered occlusally and have a dovetailed shape to help resist dislodgment and enhance retention.
Purpose of an Internal Rest
- Internal rests reinforce the framework of a partial denture, enhancing support and stability by distributing occlusal forces effectively.
Initial Steps in Preparing an Occlusal Rest Seat
- Use a handpiece with a round bur first to lower the marginal ridge and establish the initial outline of the rest seat.
Requirement for Placing Rests
- Rests must be placed on sound enamel or stable restoration material to ensure longevity and prevent damage during function.
Vulnerability to Caries Attack
- Proximal tooth surfaces are more susceptible to caries compared to the occlusal surfaces due to plaque accumulation in tight interproximal spaces.
Restoration Material for Avoiding Rest Seat Preparations
- Avoid preparing rest seat preparations on brittle materials, such as porcelain or composite, to prevent potential fracture during loading.
Application to Abutment Teeth
- A desensitizing agent should be applied to abutment teeth to minimize the risk of tooth sensitivity and caries during the preparation of rest seats.
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Description
Test your knowledge of removable partial denture rests with this quiz. Learn about the types of rests and their functions in providing support for RPDs.
