Onlay preparation design for porcelain includes all but which of the following?
Cuspal onlay preparations should have a 2.5 to 3.0 mm reduction in vertical height of the cusps and all occluding areas.
Preparation should have finish lines on any supporting cusps that are hollow ground chamfers, generally with no bevel.
Well-rounded angles on the cuspal preparation.
The typical well-defined internal line and point angles of cast-metal restorations are rounded for porcelain and the pulpal floor should be indented.
Slightly more divergent axial walls than for conventional cast metal inlay.
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