植入位点及轴向对上颌中切牙即刻种植即刻负重应力影响的三维有限元分析
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新疆维吾尔自治区自然科学基金项目(2020D01C148)


Effects of Implant Sites and Axial Direction on Stress of Maxillary Central Incisors with Immediate Implantation under Immediate Weight-Bearing: A Three-Dimensional Finite Element Analysis
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    摘要:

    目的 探讨不同牙槽窝形态上颌中切牙即刻种植即刻负重时,植入位点及轴向对种植体周围骨界面应力分布的影响。 方法 参照 1 名健康成年人口腔锥体束计算机断层( cone beam computed tomography,CBCT)影像资料,建立偏唇型、中间型、偏腭型 3 种牙槽窝形态的上颌中切牙即刻种植即刻负重三维有限元模型;模拟不同植入位点(根尖位点、偏腭/ 唇侧位点)及轴向(牙长轴、牙槽骨长轴);对已建模型以 100 N 力进行不同角度(0°、30°、45°、60°、90°)的应力加载;应用 ANSYS 软件分析种植体周围牙槽骨的应力情况。 结果 成功建立 12 个不同牙槽窝形态上颌中切牙即刻种植即刻负重三维有限元模型。 偏唇型及中间型牙槽窝形态行即刻种植即刻负重时,沿牙槽骨长轴方向偏腭位点植入种植体更易获得良好的种植体骨界面生物力学特性;偏腭型牙槽窝形态行即刻种植即刻负重时,在偏唇位点植入,不论是沿牙长轴方向还是沿牙槽骨长轴方向植入种植体,种植体周牙槽骨所受等效应力远小于根尖位点植入。 结论 不同牙槽窝形态、植入位点及轴向都会对上颌中切牙即刻种植即刻负重种植体骨界面生物力学特点产生影响。 临床中,应针对不同牙槽窝形态制定不同植入轴向及植入位点的手术方案。

    Abstract:

    Objective To investigate the influence of implant location and axial direction on stress distributions at the implant bone interface of maxillary central incisors with different alveolar fossa morphology by immediate implantation under immediate weight-bearing. Methods With reference to dental cone beam computed tomography (CBCT) image data from a healthy adult, the three-dimensional ( 3D) finite element models of maxillary central incisors with three types of alveolar fossa ( buccal, mediate, and palatal type) by immediate implatation under immediate weight-bearing were established. Different implant sites ( apical site, palatal / labial site) and axial directions (long axis of the tooth, long axis of the alveolar bone) were simulated. The established models were subjected to 100 N force at different angles (0°, 30°, 45°, 60°, 90°). The stresses in the alveolar bone around the implant were analyzed by the ANSYS software. Results Twelve 3D finite element models of maxillary central incisors with different alveolar fossa morphology by immediate implantation under immediate weight-bearing were successfully established. When alveolar fossa with buccal and mediate shape was applied with immediate implantation under immediate weight-bearing, it was easier to obtain good biomechanical properties of the implant-bone interface when implants were placed at palatal site along long axis of the alveolar bone. When alveolar fossa with palatal shape was applied with immediate implantation under immediate weightbearing, the equivalent stresses on peri-implant alveolar bone were much smaller than those on apical site, regardless of whether the implant was placed along long axis of the tooth or the long axis of the alveolar bone. Conclusions Different alveolar fossa morphology, implant location and axial direction will affect characteristics of implant-bone interface of maxillary central incisors with immediate implantation under immediate weight-bearing. In clinical practice, surgical planning on different axial direction and location of implantation should be developed for alveolar fossa with different morphology.

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杜 军,万 哲.植入位点及轴向对上颌中切牙即刻种植即刻负重应力影响的三维有限元分析[J].医用生物力学,2023,38(2):353-359

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  • 收稿日期:2022-03-12
  • 最后修改日期:2022-04-22
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  • 在线发布日期: 2023-04-25
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