[牙体预备设计对CAD/CAM全瓷基底冠适合性的影响]
[The effect of tooth preparation design on the CAD/CAM all-ceramic coping crown's fitness].
作者信息
Zhao Yun-feng, Wang Hua-rong, Li Yong
机构信息
Department of Prosthodontics, West China School of Stomatology, Sichuan University, Chengdu 610041, China.
出版信息
Zhonghua Kou Qiang Yi Xue Za Zhi. 2003 Sep;38(5):330-2.
OBJECTIVE
To study the effect of tooth preparation design on fitness of CAD/CAM all-ceramic coping crown.
METHODS
The tooth preparation comprised 2 types of occlusal convergence (10 degrees, 20 degrees), 2 margin forms (shoulder, chamfer). The MC coping were milled by Cerec 2 CAD/CAM system, cemented, embedded, sectioned, and measured at 10 sites to obtain the data of margin, shoulder, axial surface, occlusal surface fitness.
RESULTS
The coping's fitness was influenced by convergence angle and margin form. The coping's fitness was very nice (101.7 approximately 127.9) microm when the coping with 20 degrees occlusal convergence angle. Those coping with 20 degrees occlusal convergence and chamfer margin in tooth preparation provided the best fitness, its cement film thickness in margin was (40.1 +/- 11.8) microm.
CONCLUSIONS
The 20 degrees occlusal convergence and chamfer margin can be used for CAD/CAM all-ceramic crown in clinical application.
目的
研究牙体预备设计对CAD/CAM全瓷基底冠适合性的影响。
方法
牙体预备包括两种咬合聚合度（10度、20度）、两种边缘形式（肩台、斜面）。采用Cerec 2 CAD/CAM系统制作MC基底冠，进行粘结、包埋、切片，在10个部位测量，获取边缘、肩台、轴面、咬合面适合性数据。
结果
基底冠适合性受聚合角度和边缘形式影响。咬合聚合度为20度时基底冠适合性很好（101.7～127.9）微米。牙体预备中采用20度咬合聚合度和斜面边缘的基底冠适合性最佳，其边缘粘结剂膜厚度为（40.1±11.8）微米。
结论
20度咬合聚合度和斜面边缘可用于临床CAD/CAM全瓷冠修复。
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