Effect of Margin Designs on the Marginal Adaptation of Zirconia Copings.

Objective: The aim of this study was to investigate the effect of Shoulder versus Chamfer margin design on the marginal adaptation of zirconia (Zr) copings.

Materials And Methods: 40 extracted molar teeth were mounted in resin and prepared for zirconia crowns with two margin preparation designs (20=Shoulder and 20=Chamfer). The copings were manufactured by Cercon® (DeguDent GmbH, Germany) using the CAD/CAM system for each tooth.

Color management of the cervical region using different framework materials.

Background:   Color-matching of the cervical area between natural teeth and different crown prostheses is a common clinical problem.

Purpose:   The purpose of this study was to compare the color of the cervical region of five commercially available crown systems to an extracted natural tooth and to each other.

Materials And Methods:   The color of the cervical region of an extracted maxillary incisor was measured by means of a colorimeter (ShadeVision, X-Rite).