A comparative mechanical and bone remodelling study of all-ceramic posterior inlay and onlay fixed partial dentures
A comparative mechanical and bone remodelling study of all-ceramic posterior inlay and onlay fixed partial dentures
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DOI：
10.1016/j.jdent.2011.10.003
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发表时间：
2012-01-01
影响因子：
4.4
通讯作者：
Swain, Michael
中科院分区：
文献类型：
--
作者：
Field, Clarice;Li, Qing;Swain, Michael
目的：嵌体固定义齿与高嵌体固定义齿在骨改建和应力方面的比较研究还比较有限。本文的目的是评估生物学后果在后下颌骨和这两个不同的假体configuration.Methods的力学响应：三维（3D）有限元分析（FEA）模型创建，以探讨在相同的口腔环境中的嵌体和高嵌体制剂的力学响应。模拟咀嚼状态下的应力诱导骨重建。本文采用的重塑将骨中的应变与亨氏单位（HU）值的变化相关，亨氏单位（HU）值与骨形态的表面积密度（SAD）成比例，这允许直接与临床计算机断层扫描（CT）数据相关。结果表明，两种FPD设计在骨矿物质密度（BMD）方面表现出相似的结果变化。尽管高嵌体结构导致骨密度的更均匀分布。结论：本研究为进一步临床评估和研究不同FPD设计的生物力学反应和长期修复效果提供了有效的手段。临床意义：量化与嵌体/高嵌体FPD相关的体内应力分布可以进一步补充对假体耐久性的临床研究，FPD制备技术（即，锥角、材料发展）、随之而来的应力分布和下颌骨的持续生物力学响应。(C)2011爱思唯尔有限公司保留所有权利。
Objectives: Comparative studies of bone remodelling and mechanical stresses between inlay and onlay fixed partial dentures (FPD) are rather limited. The purpose of this paper was to evaluate the biological consequence in posterior mandibular bone and the mechanical responses in these two different prosthetic configurations.Methods: Three-dimensional (3D) finite element analysis (FEA) models are created to explore the mechanical responses for the inlay and onlay preparations within the same oral environment. Strain induced bone remodelling was simulated under mastication. The remodelling adopted herein relates the strain in the bone to the change of Hounsfield Unit (HU) value in proportion to the surface area density (SAD) of bony morphology, which allows directly correlating to clinical computerised tomography (CT) data.Results: The results show that both FPD designs exhibit a similar resultant change in bone mineral density (BMD) though the onlay configuration leads to a more uniform distribution of bone density. The inlay design results in higher mechanical stresses whilst allowing preservation of healthy tooth structure.Conclusions: This study provides an effective means to further clinical assessment and investigation into biomechanical responses and long-term restorative outcome with different FPD designs.Clinical significance: Quantifying in vivo stress distributions associated with inlay/onlay FPDs can further supplement clinical investigations into prosthetic durability, FPD preparation techniques (i.e., taper angles, material development), consequent stress distributions and the ongoing biomechanical responses of mandibular bone. (C) 2011 Elsevier Ltd. All rights reserved.