Clinical fit of Procera AllCeram crowns

Statement of problem. Color stability, strength, and accuracy of fit are th e main requirements for complete-ceramic crowns. The Proccra AllCeram crown system is a CAD/CAM system used to fabricate individual complete ceramic c rowns that have a dry sintered, aluminum oxide core and appear to match cli nical requirements. However, there are few articles about the clinical fit of all-ceramic crowns. Purpose. This in vivo study measured the accuracy of fit of Procera AllCera m crowns in anterior and posterior teeth. Material and methods. The clinical fit of 80 anterior and posterior Procera AllCeram crowns was evaluated by a replica technique with a light body sil icone to fill space between crown and tooth and a heavy body silicone to st abilize the light body film. After removal from the artificial crowns, the replicas were segmented, and measurements of the film thickness were perfor med with a light microscope. Results. Medians of mean marginal gap widths were between 80 and 95 mum in anterior teeth and between 90 and 145 mum in posterior teeth. Medians of ma ximal marginal gap widths ranged from 80 to 180 mum in anterior teeth and f rom 115 to 245 mum in posterior teeth. Conclusion. The accuracy of fit achieved by Procera AllCeram was comparable to other conventional and innovative systems.