Micromechanical analysis of dentin/adhesive interface by the finite element method
Micromechanical analysis of dentin/adhesive interface by the finite element method
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DOI：
10.1002/jbm.b.30012
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发表时间：
2004-07-15
影响因子：
3.4
通讯作者：
Katz, JL
中科院分区：
文献类型：
--
作者：
Misra, A;Spencer, P;Katz, JL
界面微观结构和弹性模量的空间分布对牙本质/粘接剂（d/a）界面的载荷传递有着深远的影响。微结构的影响，不同程度的脱矿的管间和管周牙本质在蚀刻过程中，以及粘合剂渗透到混合层的深度。这些因素不仅导致牙本质小管附近的独特微观结构，而且导致机械分级的混合层。本文采用有限元分析方法研究了d/a界面处的微观应力分布。这种分析现在是可行的，因为新测量的弹性模量在微米和纳米尺度。结果表明，d/a界面的形态学和微观力学性质影响应力场，使得断裂/失效可能在邻近混合/暴露胶原层的管周牙本质的应力集中区开始。结果表明，设计一个全深度的高模量混合层可以大大减少应力集中区和应力集中的大小在管周牙本质旁边的混合/暴露的胶原层。(C)2004 Wiley Periodicals，Inc.
The interfacial microstructure and spatial distribution of the modulus of elasticity have a profound effect on load transfer at the dentin/adhesive (d/a) interface. The microstructure is influenced by the varying degree of demineralization of intertubular and peritubular dentin during etching as well as the depth of adhesive penetration into the hybrid layer. These factors lead not only to a unique microstructure in the vicinity of the dentinal tubules, but also to a mechanically graded hybrid layer. This article investigates the micromechanical stress distribution at a d/a interface with the use of finite element analysis (FEA). Such analysis is now feasible given the newly measured moduli of elasticity at micro- and nanoscales. The results indicate that the morphological and micromechanical properties of the d/a interface affects the stress field such that the fracture/failure is likely to initiate in the stress-concentration zone of peritubular dentin next to the hybrid/exposed-collagen layer. The results suggest that devising a full-depth high modulus hybrid layer may considerably reduce the stress concentration zone and the magnitude of stress concentration in the peritubular dentin next to the hybrid/exposed-collagen layer. (C) 2004 Wiley Periodicals, Inc.