Boening K W, Wolf B H, Schmidt A E, Kästner K, Walter M H
School of Dentistry, Technical University of Dresden, Germany.
J Prosthet Dent. 2000 Oct;84(4):419-24. doi: 10.1067/mpr.2000.109125.
Color stability, strength, and accuracy of fit are the main requirements for complete-ceramic crowns. The Procera AllCeram crown system is a CAD/CAM system used to fabricate individual complete-ceramic crowns that have a dry sintered, aluminum oxide core and appear to match clinical requirements. However, there are few articles about the clinical fit of all-ceramic crowns.
This in vivo study measured the accuracy of fit of Procera AllCeram crowns in anterior and posterior teeth.
The clinical fit of 80 anterior and posterior Procera AllCeram crowns was evaluated by a replica technique with a light body silicone to fill space between crown and tooth and a heavy body silicone to stabilize the light body film. After removal from the artificial crowns, the replicas were segmented, and measurements of the film thickness were performed with a light microscope.
Medians of mean marginal gap widths were between 80 and 95 microm in anterior teeth and between 90 and 145 microm in posterior teeth. Medians of maximal marginal gap widths ranged from 80 to 180 microm in anterior teeth and from 115 to 245 microm in posterior teeth.
The accuracy of fit achieved by Procera AllCeram was comparable to other conventional and innovative systems.
颜色稳定性、强度和贴合精度是全瓷冠的主要要求。Procera全瓷冠系统是一种CAD/CAM系统，用于制作具有干式烧结氧化铝内核的个性化全瓷冠，似乎符合临床要求。然而，关于全瓷冠临床贴合度的文章很少。
本体内研究测量了Procera全瓷冠在前牙和后牙的贴合精度。
采用复制技术，用轻质硅橡胶填充冠与牙之间的间隙，用重质硅橡胶稳定轻质硅橡胶膜，评估80颗Procera全瓷冠的临床贴合度。从人造冠上取下后，将复制件分割，并用光学显微镜测量膜厚度。
前牙平均边缘间隙宽度的中位数在80至95微米之间，后牙在90至145微米之间。前牙最大边缘间隙宽度的中位数在80至180微米之间，后牙在115至245微米之间。
Procera全瓷冠实现的贴合精度与其他传统和创新系统相当。
