Decorative porcelain temperature firing affects the shear bond strength between zirconia ceramics and resin binder

doi:10.3969/j.issn.2095-4344.2013.51.005

Abstract

Abstract:

BACKGROUND: Studies have confirmed that the surface treatment methods such as silane coupling agent and sand blasting could improve bonding strength of zirconia ceramics and resin binder. In addition, the increase of micro cracks on the surface of zirconia ceramics can also improve the bonding strength of zirconia ceramics and resin binder. But there is a lack of related studies addressing whether repeatedly sintering would have an impact on shear bond strength of zirconia ceramics.
OBJECTIVE: To determine the effect of decorative porcelain temperature firing on the shear bond strength between dental zirconia ceramics and resin binder.
METHODS: Twenty pieces of zirconia ceramics specimens were selected from 40 tablets, and then randomly divided into five groups according to the number of sintered times: control group (without sintering), sintering groups for 2, 4, 6, 8 times. Heat starting temperature was 500 ℃, and final temperature was 1 000 ℃ with a heating rate of 55 ℃/min. The vacuum time was 7 minutes. During the sintering, the final temperature was constant. Unsintered ceramic pieces were bonded using resin binder. Universal testing machine was used to test the shear strength of the interface between the two pieces of zirconia ceramics. The interface after shearing was characterized by scanning electron microscope.
RESULTS AND CONCLUSION: The shear strength of sintering groups for 4, 6, 8 times was significantly higher than that of the control group (P < 0.05). Shear strength of specimens sintered twice was slightly higher than that of specimens without sintering, but the difference was not significant (P > 0.05). Shear strength of specimens sintered 8 times was slightly higher than that sintered 4 and 6 times (P < 0.05). Under the scanning electron microscope, there was no crack on the surface of non-sintered zirconia ceramics. After 2 times sintering, the surface appeared to have fine cracks. After sintering 4 times, visible cracks were increased. After six rounds of sintering, the surface began to have significant changes; cracks rose along with slight gaps and a small amount of adhesive residues were found. After sintering for 8 times, cracks and voids were obviously increased on the sintered surface and adhesive residues were found. It indicated that after sintering for 4, 6 and 8 times, zirconia ceramics could have a good shear strength binding to resin adhesives; with the increasing of sintering times, the shear bond strength could be increased.

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

全文链接：

Key words: biocompatible materials, dental porcelain, resin cements, shear strength

CLC Number:

R318

Gao Shi-jun, Pei Peng-fei, Lu Wei, Wang Dong-xia, Jiang Jia-zhen. Decorative porcelain temperature firing affects the shear bond strength between zirconia ceramics and resin binder [J]. Chinese Journal of Tissue Engineering Research, 2013, 17(51): 8809-8814.

Figures/Tables 3

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