Effect of core ceramic surface treatment on the failure behavior of two bilayered all-ceramic structures
10.3760/cma.j.issn.1002-0098.2015.08.007
- VernacularTitle:核瓷表面处理对二硅酸锂、氧化锆双层瓷失效行为的影响
- Author:
Tianyu TANG
1
;
Xiaodong WANG
;
Yutao JIAN
;
Ke ZHAO
Author Information
1. 中山大学光华口腔医学院·附属口腔医院修复科·广东省口腔医学重点实验室
- Keywords:
Dental porcelain;
Dental restoration failure;
Crowns;
Surface treatment
- From:
Chinese Journal of Stomatology
2015;50(8):474-477
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the effect of core ceramic surface treatment on the failure behaviors of two bilayered all-ceramic structures.Methods Lithium disilicate glass-ceramic(LDG,IPS e.max Press) and Zirconia(Cercon) specimens were divided into 4 groups(n=12) according to the following surface treatment methods:ground successively to 1 000(group A),600(group B) and 320(group C)grit silicon carbide(SiC) papers and sandblasted with 110 μm aluminum oxide particle(group D,as control).Surface roughness was measured using a profilometer.After veneer sintering,the flexural strength σ was measured with biaxial flexure test and the reliability of strength was analyzed with Weibull distribution.Failure modes and fractographic patterns were analyzed by optical stereo and scanning electron microscopy (SEM).Results For LDG,no significant difference was found for the flexural strength values among groups (F=0.406,P=0.750).No significant difference was found in Weibull modulus among groups(the confidence bounds overlapped with each other).SEM and optical stereo observation results showed that all the bilayered LDG specimens failed cohesively.For zirconia,Mean flexural strength values were (541 ± 75),(533± 73),(529 ± 78) and (640 ± 95) MPa for groups A,B,C and D,respectively,and group D demonstrated a significantly higher flexural strength compared to the other three groups(P ＜ 0.05).No significant difference were found among groups(the confidence bounds overlapped with each other).Specimens in all groups failed mainly adhesively,while those in group D presented lower percentage of adhesive failure.Conclusions Core ceramic surface treatment has no influence on the failure behaviors of LDG based bilayered structures.Sandblasting can increase the flexural strength of bilayered zirconia structures by reducing the incidence of delamination.
