Micromechanics of implant/tissue interfaces.
Micromechanics of implant/tissue interfaces.
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发表时间：
1992
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通讯作者：
C. Ko;D. Kohn;S. Hollister
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作者：
C. Ko;D. Kohn;S. Hollister
建立了一系列有限元模型，用于评价种植体/组织界面的微观力学性能。传统的有限元整体模型的牙种植体，假设一个连续的种植体/骨界面，开发，以便在种植体和周围组织的一般应力模式可以得到。对于所有具有直接骨/种植体接触的整体模型，骨中的应力集中在牙槽嵴和牙尖区域。在骨/植入物界面中添加100微米厚的纤维组织层，使应力集中在植入物表面附近的骨的中间三分之一处。中间三分之一的应力比没有纤维组织的情况高十倍。骨组织和金属的体积加权平均材料刚度假设下建模的界面证实了这些一般的应力模式，但没有提供界面区的应力细节。最后，利用均匀化理论计算了界面区的等效材料常数。从这些等效常数，单线程周围的局部应变计算。这些等效材料特性对微观结构敏感。因此，现在可以量化界面区内的应力模式，并考虑整个植入物的单个表面结构周围的局部微观力学行为。
A series of finite element models was developed for evaluation of the micromechanics of implant/tissue interfaces. Conventional finite element global models of a dental implant, assuming a continuum implant/bone interface, were developed so that general stress patterns in the implant and surrounding tissue could be obtained. Stresses in bone were concentrated on the alveolar crest and apex region for all global models having a direct bone/implant contact. The addition of a 100-microns-thick layer of fibrous tissue into the bone/implant interface concentrated the stresses in the middle third of the bone adjacent to the implant surface. Stresses in the middle third were ten times higher than in the cases without fibrous tissue. Interfaces modeled under the assumption of a volume-weighted average material stiffness of bone tissue and metal confirmed these general stress patterns, but provided no stress details of the interfacial zone. Finally, the equivalent material constants of the interfacial zone with and without fibrous tissue were calculated by homogenization theory. From these equivalent constants, local strains around single threads were calculated. These equivalent material properties are sensitive to the microstructure. Therefore, it is now possible for stress patterns within the interfacial zone to be quantified and the local micromechanical behavior around individual surface structures for whole implants accounted for.