3D full-field strain in bone-implant and bone-tooth constructs and their morphological influential factors
3D full-field strain in bone-implant and bone-tooth constructs and their morphological influential factors
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DOI：
10.1016/j.jmbbm.2020.103858
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发表时间：
2020-10-01
影响因子：
3.9
通讯作者：
Du, Jing
中科院分区：
文献类型：
--
作者：
Zhou, Yuxiao;Gong, Chujie;Du, Jing
骨-牙和骨-种植体界面的生物力学影响许多牙科治疗的结果，例如种植体的放置，因为骨、牙齿和牙周韧带是适应机械刺激变化的活组织。在这项工作中，结合micro-CT对人尸体下颌骨骨-牙和骨-种植体结构进行了力学测试。采用数字体积相关技术，测量种植体和牙体载荷下骨的三维全场应变。同时，通过显微ct图像分析，测量骨形态、骨-种植体、骨-牙接触情况。结果表明，当牙齿被植牙取代时，骨骼的张力增加了。在笔形种植体骨中观察到应变浓度，在颊骨板中也观察到应变浓度，颊骨板也是种植体放置后临床观察到的骨吸收区。减少种植体稳定性测量（共振频率分析和扭矩测试）表明种植体周围应变增加，但它们的关系可能不是线性的。种植体周围骨应变随骨与种植体接触比（BIC）的减小而线性增加。它也随骨-牙/骨-种植体接触比的增加而线性下降。随着颊骨板厚度的减小，颊骨板的高应变呈线性增加。本研究结果揭示了骨-牙和骨-种植体结构的三维全场应变，以及它们的几个形态学影响因素。
The biomechanics of bone-tooth and bone-implant interfaces affects the outcomes of several dental treatments, such as implant placement, because bone, tooth and periodontal ligament are living tissues that adapt to the changes in mechanical stimulations. In this work, mechanical testing coupled with micro-CT was performed on human cadaveric mandibular bone-tooth and bone-implant constructs. Using digital volume correlation, the 3D full-field strain in bone under implant loading and tooth loading was measured. Concurrently, bone morphology and bone-implant and bone-tooth contact were also measured through the analysis of micro-CT images. The results show that strain in bone increased when a tooth was replaced by a dental implant. Strain concentration was observed in pen-implant bone, as well as in the buccal bone plate, which is also the clinically-observed bone resorption area after implant placement. Decreasing implant stability measurements (resonance frequency analysis and torque test) indicated increased peri-implant strain, but their relationships may not be linear. Peri-implant bone strain linearly increased with decreasing bone-implant contact (BIC) ratio. It also linearly decreased with increasing bone-tooth/bone-implant contact ratio. The high strain in the buccal bone plate linearly increased with decreasing buccal bone plate thickness. The results of this study revealed 3D full-field strain in bone-tooth and bone-implant constructs, as well as their several morphological influential factors.