REST AND REST SEATS in prosthodontics ppt

Rest and rest seats in prosthodontic

1. REST AND REST SEATS

2. DEFINITION REST- a component of a partial denture on a tooth surface that provides vertical support is called rest. REST SEAT-Prepared surface of an abutment to receive the rest is called rest seat

3. uses Prevent settling of the denture Prevents impingement Distributes occlusal force

4. Occlusal rest and rest seats Outine form- triangular with apex towards centre base-2.5mm Reduction of marginal ridge-1.5mm.

5. Lingual rest On canine and incisor teeth Preparation-slightly rounded v at gunction of gingival and middle third of tooth Floor of rest seat-towards cingulum

6. INTERPROXIMAL OCCLUSALREST SEATS REQUIRED IN DESIGNING OF DIRECT RETAINER Prepared as individual occlusal rest seats Used to prevent interproximal wedging.

7. INTERNAL OCCLUSAL RESTS Supported by cast retainers Occlusal support –floor of the rest seat Horizontal stabilisation – from vertical walls of rest seat

8. INCISAL REST AND REST SEATS Placed on incisal angles of anterior teeth Less desirable to use as an abutment Predominantly used as auxillary restsor indirect retainer Preparation-2.5mm wide and 1.5 mm deep

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