* CLASSIFICATION OF ABUTMENTTEETH:
1. Abutment teeth that require only minor modifications to their coronal portions;
2. Those that are to have restorations other than crown:
3. Those that are to have crowns.
A. Abutment teeth that require only minor modifications to their coronal portions:
* THIS GROUP INCLUDE:
* SEQUENCE AND PRINCIPLES OF PREPARATIONS ON SOUND ENAMEL OR EXISTING RESTORATIONS:
1. Developing of guiding planes:
2. Changing the height of contour and modifying retentive undercuts:
3. Rest seat preparation:
i. Occlusal rest seat preparation
ii. Cingulum rest seat preparation:
iii. Incisal rest seat preparation:
iv. Preparation for embrasure clasp:
B. ABUTMENT PREPARATIONS USING CONSERVATIVE RESTORATIONS:
Silver amalgam alloy
Composite resin restorations
Inlay preparations:
C. ABUTMENT PREPARATIONS USING CROWNS:
* These may be in the form of three quarter or full cast crowns or porcelain veneer crowns.
∙ Advantages of crown restora¬tions on teeth used as partial denture abutments:
* SPLINTING OF ABUTMENT TEETH:
* MISSING ANTERIOR TEETH:
* TEMPORARY CROWNS WHEN A PARTIAL DENTURE IS BEING WORN:
* FABRICATING RESTORATIONS TO FIT EXISTING DENTURE RETAINERS:
The technique for making a crown to fit the inside of a clasp.

Download the complete lecture

Doc format - 52 kb

http://4dent.net/url/1064