Marginal Adaptation, Gap Width, and Fracture Strength of Teeth Restored With Different All-Ceramic Vs Metal Ceramic Crown Systems: An in Vitro Study

摘要

This study evaluated marginal adaptation before and after thermomechanical CfCMU loading, gap width and fracture strength of all-ceramic single crowns, as compared to porceiain-fused-to-meial (PBS. Thirty extracted premolars were prepared with a round shoulder of 10 mm depth. Specimens were restored with zirconia-ceramic (Group I), lithium disilicate (Group 2) and metal-ceramic single crowns (Group 31 The replica of each sample was observed with a scanning electron microscope (SEM) to evaluate the crown-cement (c-c) and tooth-cement interface (t-c).