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Thursday, January 31, 2008

Operative Dentistry MCQ 19

Thursday, January 31, 2008

Onlay preparation design for porcelain includes all but which of the following?

    1. Cuspal onlay preparations should have a 2.5 to 3.0 mm reduction in vertical height of the cusps and all occluding areas.

    2. Preparation should have finish lines on any supporting cusps that are hollow ground chamfers, generally with no bevel.

    3. Well-rounded angles on the cuspal preparation.

    4. The typical well-defined internal line and point angles of cast-metal restorations are rounded for porcelain and the pulpal floor should be indented.

    5. Slightly more divergent axial walls than for conventional cast metal inlay.


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