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Dental Rests and Rest Seats

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Questions and Answers

What is the function of an occlusal rest?

Creating a recess in a tooth to receive the rest

Supporting the denture base against vertical forces (correct)

Elevating the vertical dimension of occlusion

Preserving the location of the tooth in relation to the rest

What is a rest seat?

A part of a clasp assembly rest or an auxiliary rest

A rigid extension of a partial removable dental prosthesis

A projection or attachment on the side of an object

A recess in a tooth or restoration created to receive an occlusal, incisal, cingulum, or lingual rest (correct)

What are the requirements for rests and rest seats?

To elevate the vertical dimension of occlusion

To fit the tooth accurately and preserve its location in relation to the tooth (correct)

To transmit stress at an angle to the long axis of the tooth

To be weak enough to deform under loads

What happens if rests do not transmit stress along the long axis of the tooth?

The vertical dimension of occlusion is elevated Signup and view all the answers

What is a partial denture without occlusal rests called?

"Gum stripper" Signup and view all the answers

What is the function of an occlusal rest?

To minimize food collection beneath it Signup and view all the answers

What is the purpose of a rest seat?

To receive occlusal, incisal, cingulum, or lingual rest Signup and view all the answers

What happens if rests do not transmit stress along the long axis of the tooth?

They act as a gum stripper Signup and view all the answers

Why must rests fit the tooth accurately?

To minimize food collection beneath it Signup and view all the answers

What is the consequence of a partial denture without occlusal rests?

It is referred to as a 'gum stripper' Signup and view all the answers

Study Notes

Occlusal Rests and Rest Seats

The function of an occlusal rest is to transmit vertical forces to the abutment tooth, preventing movement of the partial denture.
A rest seat is a preparation on the tooth surface that receives the occlusal rest.

Requirements for Rests and Rest Seats

Rests and rest seats must be accurately fitted to prevent movement and ensure proper transmission of forces.
Rests must transmit stress along the long axis of the tooth to prevent tooth damage.

Consequences of Improper Rests

If rests do not transmit stress along the long axis of the tooth, it can lead to tooth damage or root fracture.
A partial denture without occlusal rests is called a "claspedenture", which can lead to tooth movement and instability.

Importance of Accurate Fit

Rests must fit the tooth accurately to prevent movement and ensure proper transmission of forces.
Accurate fit prevents tooth damage and ensures the success of the partial denture.

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Description

Test your knowledge of dental prosthetics with a quiz on rests and rest seats. Learn about projections, attachments, and rigid extensions used in partial removable dental prosthesis.