Influence of interfacial surface roughness on flexural strength of bilayered lithium-disilicate glass ceramics
10.3760/cma.j.issn.1671-0290.2013.06.015
- VernacularTitle:界面粗糙度对双层硅酸锂玻璃陶瓷材料断裂强度的影响
- Author:
Xiaodong WANG
;
Xinping ZHANG
;
Ke ZHAO
- Publication Type:Journal Article
- Keywords:
Interfacial surface roughness;
Dental porcelain;
Flexural strength;
Failure mode
- From:
Chinese Journal of Medical Aesthetics and Cosmetology
2013;19(6):449-452
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the influence of the core-veneer interfacial surface roughness on the flexural strength and failure mode of bilayered lithium-disilicate ceramic structure.Methods Forty IPS e.max Press bar-shaped specimens were fabricated and divided randomly into 4 groups.The core-veneer interfacial surfaces of the core materials were ground to specific surface roughness with silicon carbide papers of various grits.Specimens of the groups A,B and C were ground by silicon carbide papers of 1000 grits,600 grits and 320 grits,respectively.While specimens in group D were sandblasted without any grinding as recommended by the manufacturer's instruction.After veneer application and sintering,the flexural strength of bilayered specimens were measured utilizing three-point bending test,and the failure mode was observed using stereomicroscopy.Results The mean flexural strength value of bilayered specimens for groups A,B,C and D were (164.27±15.02),(159.21± 15.72),(156.14±17.10) and (152.97±15.61) MPa,respectively.However,there was no significant differences in fracture strength between groups (P＞0.05).All specimens demonstrated cohesive failure of veneer porcelain right underneath the indenter,without any core-veneer delamination.Conclusions The influence of core-veneer interfacial surface roughness on flexural strength of bilayer lithium-disilicate-based ceramics is not significant.The superior bond between core and veneer provides a reliable interface.
