Distortion of occlusal porcelain during glazing.

The amount of vertical height distortion of porcelain cusps and fossae during glazing was investigated, and the following conclusions can be drawn. 1. Vertical height loss was minimized by using opaque cones to support cuspal porcelain. 2. The amount of vertical distortion was less after the second glaze than the first. 3. Adjustment of the occlusal surface after the first glaze followed by reglazing minimized distortion. Glazing distortion can, in fact, be minimized to an acceptable level.