What is rest seat in RPD?
A REST is any rigid part of an RPD framework which contacts a properly prepared surface of a tooth. A REST PREPARATION or REST SEAT is any portion of a tooth or restoration properly prepared to receive a rest.
Where should rest seats be placed?
Rests should always be located on properly prepared tooth surfaces. The prepared surface of an abutment to receive the rest is called the rest seat. Rests are designated by the surface of the tooth prepared to receive them (occlusal rest, lingual rest, and incisal rest).
How deep should rest seats be?
An incisal rest seat should appear as a small, V-shaped notch located approximately 1.5 to 2.0 mm from the proximal-incisal angle of the tooth. The deepest part of the preparation should be toward the center of the tooth mesiodistally.
What is auxiliary occlusal rest?
20. AUXILIARY OCCLUSAL REST Most frequently used. Located on the occlusal surface far away from distal extension denture base. It is placed perpendicular to the midpoint of the fulcrum line. Ideal location is central incisor, which is weak, therefore bilateral rests on first premolars are effective.
What is occlusal rest?
Quick Reference. A rigid, usually metal, extension of a removable partial denture which rests on the occlusal surface of a posterior tooth for the support of a prosthesis.
What is indirect retainer in prosthodontics?
An indirect retainer consists of a minor connector and a rest, and helps to stabilize the distal extension RPD, indirectly (compared to direct retention with clasps), when the patient eats sticky foods. Most frequently, indirect retainers are placed on canines or the mesial fossa of first premolars.
Why the occlusal rest should be prepared that direct the occlusal force along the long axis of the abutment?
The relationship between a rest and a rest seat must be such that forces transmitted from the prosthesis to an abutment are directed apically down the long axis of the tooth. In this manner, stress can be absorbed by the fibers of the periodontal ligament without damaging the ligament or the supporting bone.
What are occlusal rests and similar components?
Occlusal Rests And Similar Components 3. Definition Rests are Rigid Extensions of a Partial Denture, Placed in Rest Seats, Which are Prepared on Either the Occlusal, Lingual Surfaces or Incisal Edges of the Teeth, Providing Support to the Partial Denture 4. REST 5.
What is a rest seat in dentistry?
Rest seat: The prepared recess in a tooth or restoration developed to receive the occlusal, incisal, cingulum, or lingual rest. 31 December 2017 Glossary of Prosthodontic Terms, Edition Nine, J Prosthet Dent 2016 May. 117 (5S). 7 8.
How should an occlusal rest pass through a tooth?
Such a rest should pass over the lowered marginal ridge on the side of the tooth opposite the primary rest and should, if possible, be inclined slightly apically from the marginal ridge. However, two opposing occlusal rests on diverging tooth inclines will function to prevent unfavorable forces if all related connectors are sufficiently rigid.
What is a rest seat GPT 9?
5. Rest seat According to GPT 9 The prepared recess in a tooth or restoration created to receive the occlusal, incisal, cingulum or lingual rest. According to McCracken’s The prepared surface of an abutment to receive the rest.
