A Comparative In Vitro Study Evaluating the Marginal Adaptation of Zirconium Computer-Aided Design/Computer-Aided Manufacture and Press-ceramic Veneers

摘要

Introduction: One method to evaluate the clinical success of cemented restorations is measuring the marginal adaptation. There is a correlation between the fitting of the restoration and problems caused by clinically undetectable passage of bacteria between the tooth structure and the veneer.Aim: To evaluate in comparison the marginal adaptation of veneers produced via CAD/CAM and press technique.Materials and methods: 32 extracted incisors are divided into two equal-number groups (n=16) according to the production technique - CAD/CAM zirconium veneers and press-ceramic veneers. Cut sections are examined under a SEM magnification. Marginal accuracy is measured as the distance between the finish line of the tooth and the margin of the veneer at eight fixed locations.Results: The mean values of marginal gap of group 1 are: external adaptation - 79.88 3.71 m; internal adaptation - 79.14 15.70 m; cervical adaptation - 82.39 28.55 m; incisal adaptation - 86.85 21.72 m. The mean values of marginal gap of group 2 are: external adaptation - 100.31 2.16 m; for internal adaptation - 101.01 12.51 m; cervical adaptation - 91.55 3.31 m; incisal adaptation - 93.76 2.54 m.Conclusions: Veneers produced via CAD/CAM technology have better fit at the external and internal marginal wall. There is no statistically significant difference between the gaps at the cervical and the incisal areas.