Effect of Tooth Preparation on Adaptation of Dental CAD/CAM “Cerec2” Crowns

Abstract

The purpose of this study was to examine the effect of tooth preparation on marginal and internal fit of all ceramic crowns fabricated by dental CAD/CAM “CEREC 2” system. There were two test conditions for the margins as well as for the occlusal surfaces. Margin types were: a) horizontal and b) inclined. Occlusal surfaces were: a) flat and b) V shape. “Spacer” mode was set at 30μEm. Five specimens of each test condition type were prepared on the extracted human molars. All of the tested crowns were seated on the tooth preparations with adhesive resin cement. The specimens were cut mesiodistally at the center of tooth crown. The thickness of the adhesive resin cement layer on seven measured points on the cut surface was measured using a measuring microscope.
As a result, models with horizontal margin and flat occlusal surface presented the best conditions for crown fitting.