The influence of ferrule effect on post-restored restoration using extended finite element method
10.3760/cma.j.issn.1002-0098.2014.06.009
- VernacularTitle:桩核冠修复体牙本质肩领效应的扩展有限元分析
- Author:
Yiyi ZHANG
1
;
Ayiguli ABUDUSIMU
;
Qing LI
;
Yining WANG
Author Information
1. 430079,武汉大学口腔医学院口腔基础医学省部共建国家重点实验室培育基地和口腔生物医学教育部重点实验室
- Keywords:
Post and core technique;
Finite element analysis;
Dental restoration failure;
Ferrule
- From:
Chinese Journal of Stomatology
2014;49(6):357-361
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the stress distributions and cracks initiation and propagation within the cementation of post and core restored teeth with various ferrule heights.Methods Threedimentional finite element(FE) models of post and core restored teeth with different ferrule heights(0,1,2,3 mm) were created by using the data of a three-dimentional non-contact digital scanning.Vertical oblique forces of 350 N (45 ° to the long axis of the root) were applied on the lingual surface of the teeth (4 mm below the incisal edge).Both linear analysis and extended finite element methods (XFEM) were used to investigate stress distributions,especially those in the adhesive interfaces.Results Linear analysis results showed that the stress distributions within the root were quite similar among the groups.However,obvious stress concentrations were detected on palatal glass ionomer cement layer in the groups with 0 mm and 1 mm ferrule.According to the XFEM results,cracks were firstly initiated within the glass ionomer cement layer,and then propagated towards the adhesive resin cement layer.The ultimate loads that induced the damage within glass ionomer cement layer and adhesive resin cement layer in 0 mm ferrule group (50.4 and 94.7 N)were less than those in 3 mm ferrule group(65.9 and 228.2 N).Conclusions Adhesive interface was the susceptible structure of post and core restored teeth.Increasing ferrule height can significantly reduced the stress concentration within the palatal adhesive interface.
