The effect of tooth preparation design on the CAD/CAM all-ceramic coping crown's fitness.
- Author:
Yun-feng ZHAO
1
;
Hua-rong WANG
;
Yong LI
Author Information
- Publication Type:Journal Article
- MeSH: Computer-Aided Design; Crowns; Dental Porcelain; Dental Prosthesis Design; Humans; Tooth Preparation, Prosthodontic
- From: Chinese Journal of Stomatology 2003;38(5):330-332
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo study the effect of tooth preparation design on fitness of CAD/CAM all-ceramic coping crown.
METHODSThe 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.
RESULTSThe 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.
CONCLUSIONSThe 20 degrees occlusal convergence and chamfer margin can be used for CAD/CAM all-ceramic crown in clinical application.
