Diametral compression test with composite disk for dentin bond strength measurement - Finite element analysis
Diametral compression test with composite disk for dentin bond strength measurement - Finite element analysis
复制标题
DOI：
10.1016/j.dental.2012.07.004
复制
发表时间：
2012-10-01
期刊：
影响因子：
5
通讯作者：
Lin, Chun-Pin
中科院分区：
文献类型：
--
作者：
Huang, Shih-Hao;Lin, Lian-Shan;Lin, Chun-Pin
Objective.在先前的研究中提出了一种使用复合材料盘在径向压缩下测量根管内桩与牙本质之间的粘结强度的新技术。本研究涉及的应力分布内的复合光盘，使粘结强度计算准确。改变几何参数和材料参数对后牙本质界面应力的影响也进行了评估。采用三维有限元法分析了应力分布，并进行了敏感性分析。为了更好地理解实验中观察到的破坏过程，还模拟了牙本质界面进行性脱粘。材料失配导致界面处的应力集中。结果作为校正因子与均匀圆盘的解析解一起使用。牙本质界面应力与牙本质应力的比较表明，牙本质界面脱粘发生在牙本质断裂之前。本文给出的数值解将有助于采用径向压缩的复合材料圆盘进行粘结强度的测量。(C)2012年牙科材料学院。由Elsevier Ltd.出版。保留所有权利。
Objective. A novel technique using a composite disk under diametral compression was presented in a previous study for measuring the bond strength between intracanal posts and dentin. This study deals with the stress distribution within the composite disk to allow the bond strength to be calculated accurately. The effects of changing geometrical and material parameters on the post-dentin interfacial stress are also evaluated.Methods. The finite element method with 3D models is used to analyze the stress distribution and to carry out the sensitivity analysis. Progressive post-dentin interfacial debonding is also simulated to better understand the failure process observed in experiments.Results. Material mismatch causes stress concentrations at the interfaces. The results are presented as correction factors to be used in conjunction with the analytical solution for a homogeneous disk. Comparison between the stresses at the post-dentin interface and those in dentin confirms that interfacial debonding will take place prior to fracture in the dentin.Significance. The numerical solutions presented here will facilitate the adoption of the composite disk in diametral compression for bond strength measurement. (C) 2012 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.