Factors that affect the fit of CAD/CAM inlay fabricated from a hybrid resin block

Abstract

 The present in vitro study was conducted to verify the clinical applicability of a computer-aided design and computer-aided manufacturing (CAD/CAM) inlay restoration. The purpose of the study was to examine the effects of the cavity form, the cement space setting, the resin block type, and the presence of an undercut near the margin on the fit of CAD/CAM inlays fabricated from commercially available hybrid resin blocks. The fit of the CAD/CAM inlay was affected by the cavity form and the cement space values. CAD/CAM inlays with metal inlay cavity forms did not fit as well as modified cavity forms without sharp edges. There was no significant difference in fit among the hybrid resin block products. The results suggest that a cavity that eliminates sharp edges and an undercut, has a rounded open cavity shape, and provides an appropriate cement space is preferable.