Analysis of residual stress between core and veneer ceramics by finite element method
10.3969/j.issn.1001-3733.2010.02.08
- VernacularTitle:全瓷修复体残余应力的有限元分析
- Author:
Haitao XIN
;
Xinyang MA
;
Yulu WU
- Publication Type:Journal Article
- Keywords:
Finite element analysis;
Residual stress;
Dental ceramics;
Viscoelasticity
- From:
Journal of Practical Stomatology
2010;26(2):173-176
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To study the residual stress distribution through the thickness of bilayered dental ceramic subjected to thermal stress, in order to improve the restoration. Methods: The finite element model of bilayered dental ceramic was set up based on International Organization for Standardization(ISO) 96936:1999. The residual stresses were calculated in viscoelastic and elastic phases during cooling of dental ceramic to analyze the residual stress distribution. Results: The deformation of core was greater than the veneer ceramics during the cooling period of dental ceramic. The residual stress increased with the decreasing of the temperature approaching the interface of core and veneer ceramics. But it decreased with the increasing of the thickness of veneer ceramics.Conclusion: Thermal compatibility of core and veneer ceramics is very important to the residual stress distribution in the bilayered dental ceramic, which may benefit to All-ceramic restorations. The viscoelastic behavior of ceramic should be taken into account in the thermal compatibility.
