Influence of veneering porcelain thickness on the compressive strength of zirconia all-ceramic crown
10.3969/j.issn.1001-3733.2016.02.005
- VernacularTitle:饰面瓷厚度对氧化锆全瓷冠抗压缩破坏力的影响
- Author:
Xiaoxue WANG
;
Yafei QIU
;
Shuo YUAN
;
Zhao ZHANG
;
Changjun GUO
- Publication Type:Journal Article
- Keywords:
Zirconia;
All-ceramic crown;
Veneering porcelain thickness;
Compressive strength
- From:
Journal of Practical Stomatology
2016;32(2):178-181
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To explore the influence of the veneering porcelain thickness on the compressive strength of zirconia all-ceramic crown.Methods:25 zirconia basement crowns with the thickness of 0.5 mm were made by CAD-CAMsystem,and then were divided into 5 groups randomly with the veneering porcelain thickness of 0.5(A),1.0(B),1.5(C),2.0(D)and 2.5 mm(E)respectively. The compressive strength of the samples was measured by a testing machine.Statistical analysis was conducted by SPSS13.0 software. The microstructure of the fractured bonding interface of the specimens was observed by scanning electron microscope(SEM).Results:The compressive strength in group A,B,C,D and E were:(1 279.96 ±42.85)N,(2 235.44 ±50.14)N,(2 216.38 ±48.97)N, (2 169.22 ±60.40)N and (2 028.70 ±47.37)N respectively(A or E vs B,C or D,P <0.01;A vs E,P <0.01;B vs C or D,P >0.05;C vs D,P >0.05).SEMobservation found that in group A and E the bonding interface was uneven and loose,the cracks and spores in veneering porcelain appeared more and larger,and had a more intensive distribution.Conclusion:When the veneering porce-lain is too thick or too thin,the compressive strength of zirconia all-ceramic crown decreases,the thickness of the veneering porcelain should be controled in an appropriate range.
