Effect of Crystallization Firing on Marginal Gap of CAD/CAM Fabricated Lithium Disilicate Crowns.

Purpose: To evaluate the marginal gaps of CAD/CAM (CEREC 3) produced crowns made from leucite-reinforced glass-ceramic (IPS Empress CAD) blocks (LG), and lithium-disilicate (IPS e.max CAD) blocks before (LD-B), and after (LD-A) crystallization firing.

Materials And Methods: A human molar tooth (#19) was mounted with adjacent teeth on a typodont and prepared for a full-coverage ceramic crown.

A dear teacher.

We learn much of our professional expectations from colleagues, especially those we admire. This report describes one dentist's disappointment in extending the same professional relationship to an associate that he had experienced when he first associated. In the absence of a written employment agreement, the new associate set up practice a few minutes away, stealing staff and patients.