This is a draft cheat sheet. It is a work in progress and is not finished yet.
Tooth Alteration Procedures
1.Rest Seat |
2.Guide Plane |
3. Tooth Recontouring |
4. Dimpling |
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Rest and Rest Seat
REST |
A rigid component of a removable partial denture which rests in a recessed preparation on the occlusal, lingual or incisal surface of a tooth to provide vertical support for the denture. |
REST SEAT |
A portion of a tooth selected and prepared to receive an occlusal, incisal or lingual rest |
Functions of Rest
- To direct forces along the long axis of the abutment tooth. |
- To prevent the denture base from moving cervically and impinging gingival tissue |
- To maintain a planned clasp-tooth relationship |
- To prevent extrusion of abutment teeth |
- To serve as an indirect retainer by preventing rotation of the partial denture (Class I or II RPD’s only). |
- To close small space between teeth |
Rest and stress control
In a tooth supported RPD all the stresses are transferred to the abutment tooth. |
In a tooth tissue supported RPD, only a portion of the stresses are transferred to the teeth, while the edentulous ridge must absorb the remainder of the load. |
Rest serves as a vertical stop for the prosthesis |
Firm, positive contact between a rest and rest seat minimizes vertical displacement of the prosthesis and prevents injury to the soft tissues. |
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