The influence of cervical collar height on the compressive strength of CAD/CAM zirconia-ceramic restora-tion
10.3969/j.issn.1001-3733.2014.02.03
- VernacularTitle:颈环高度对 CAD/CAM氧化锆全瓷冠抗压碎性能的影响
- Author:
Xinwen ZHOU
;
Xiyun LIU
- Publication Type:Journal Article
- Keywords:
Cervical collar;
Zirconia;
All-ceramic restoration;
Compressive strength
- From:
Journal of Practical Stomatology
2014;(2):161-164
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To evaluate the influence of cervical collar height on the compressive strength of CAD/CAMzirconia-ceramic restoration.Methods:Zirconia cores were manufactured and divided into 5 groups (n =1 0)based on the cervical collar height(mm):0.0(A),1 .0(B),1 .5(C),2.0(D)and 2.5(E).After veneered with porcelain,all the samples were cemented on the metal tooth analog and then mounted in an universal test machine.The force was applied at a crosshead speed of 1 mm/min until catastrophic fail-ure occurred.Fracture loads and failure modes were recorded.Results:Mean of the fracture strength values(kN)in group A,B,C, D and E were 0.95 ±0.39,1 .29 ±0.50,1 .54 ±0.28,2.04 ±0.1 9 and 2.27 ±0.53 respectively(among groups,P <0.05).Two types of fracture modes were observed:chipping of the veneering porcelain and fracture of the veneering porcelain together with the framework.Conclusion:Zirconia coping design with 1 .5 mm cervical collar height may increase the compressive strength of CAD/CAMzirconia-ceramic restoration.
