10 Questions
What is the function of an occlusal rest?
Supporting the denture base against vertical forces
What is a rest seat?
A recess in a tooth or restoration created to receive an occlusal, incisal, cingulum, or lingual rest
What are the requirements for rests and rest seats?
To fit the tooth accurately and preserve its location in relation to the tooth
What happens if rests do not transmit stress along the long axis of the tooth?
The vertical dimension of occlusion is elevated
What is a partial denture without occlusal rests called?
"Gum stripper"
What is the function of an occlusal rest?
To minimize food collection beneath it
What is the purpose of a rest seat?
To receive occlusal, incisal, cingulum, or lingual rest
What happens if rests do not transmit stress along the long axis of the tooth?
They act as a gum stripper
Why must rests fit the tooth accurately?
To minimize food collection beneath it
What is the consequence of a partial denture without occlusal rests?
It is referred to as a 'gum stripper'
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.
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.
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