The influence of cervical collar height on the compressive strength of CAD/CAM zirconia-ceramic restora-tion / 实用口腔医学杂志
Journal of Practical Stomatology
;
(6): 161-164, 2014.
Article
in Chinese
| WPRIM
| ID: wpr-445220
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 observedchipping 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.
Full text:
Available
Index:
WPRIM (Western Pacific)
Language:
Chinese
Journal:
Journal of Practical Stomatology
Year:
2014
Type:
Article
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