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首页> 外文期刊>The Journal of Prosthetic Dentistry >Photoelastic stress analysis of implant-tooth connected prostheses with segmented and nonsegmented abutments.
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Photoelastic stress analysis of implant-tooth connected prostheses with segmented and nonsegmented abutments.

机译：具有分段和非分段基台的种植体-牙齿连接假体的光弹性应力分析。

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STATEMENT OF PROBLEM: There is some question about whether implant abutment selection affects the transfer of load between connected implants and natural teeth. PURPOSE: The purpose of this study was to compare stress transfer patterns with either 1 or 2 posterior implants connected to a single anteriorly located simulated natural tooth with either 1 or 2 segmented and nonsegmented implant abutments under relevant functional loads by use of the photoelastic stress analysis technique. MATERIAL AND METHODS: A model of a human left mandible, edentulous posterior to the first premolar, with two 3.75-mm x 13-mm screw-type implants embedded within the edentulous area, was fabricated from photoelastic materials. The implants were in the first and second molar positions. Two fixed partial denture prosthetic restorations were fabricated with either segmented conical abutments or nonsegmented UCLA abutments. Vertical occlusal loads were applied at fixed locations on the restorations. The photoelastic stress fringes that developed in the supporting mandible were monitored visually and recorded photographically. The stress intensity (number of fringes), stress concentrations (closeness of fringes), and their locations were subjectively compared. RESULTS: Loading on the restoration over the simulated tooth generated apical stresses of similar intensity (fringe order) at the tooth and the first molar implant for both abutment types. Low-level stress was transferred to the second molar implant. Loading directed on the implant-supported region of the restoration demonstrated low transfer of stress to the simulated tooth. Nonvertical stress transfer with slightly higher intensity was observed for the nonsegmented abutment. CONCLUSION: Within the limitations of this simulation study, stress distribution and intensity for the 2 implant conditions was similar for segmented and nonsegmented abutment designs. Magnitude of stresses observed for both abutment designs was similar for the single implant condition. Vertical loading produced more nonaxial stresses away from the force applied for the 1 implant condition with the nonsegmented abutment. Direct loading results were similar for both abutment designs. Specific recommendations for selection of implant abutment and application should be based on clinical criteria.
机译：问题陈述：关于种植体基台的选择是否会影响所连接的种植体与天然牙齿之间的负荷转移，存在一些问题。目的：本研究的目的是通过使用光弹性应力分析，比较在相关功能载荷下，将1个或2个后牙种植体连接到单个前位模拟自然牙上的应力传递模式，该假牙具有1个或2个分段的和无节段的种植体基台技术。材料与方法：用光弹性材料制作一个模型，该模型是人类左下颌第一前磨牙后的无牙的模型，在无牙区域内嵌有两个3.75 mm x 13 mm的螺钉型植入物。植入物处于第一和第二磨牙位置。用分段的圆锥基台或不分段的UCLA基台制作了两个固定的局部义齿修复体。在修复体的固定位置上施加垂直咬合载荷。视觉监测在支撑下颌骨中形成的光弹性应力条纹，并进行照相记录。主观比较了应力强度（条纹数），应力集中（条纹的紧密度）及其位置。结果：在两种基牙类型的牙齿和第一个磨牙种植体上，模拟牙齿上的修复体上的载荷产生了类似强度（条纹顺序）的顶应力。低水平应力转移到第二磨牙植入物。施加在修复体的种植体支撑区域上的载荷显示出应力向模拟牙齿的低传递。对于非分段基台，观察到强度略高的非垂直应力传递。结论：在此模拟研究的限制内，对于分段和非分段基台设计，两种种植体条件下的应力分布和强度均相似。在单个种植体条件下，两种基台设计所观察到的应力大小相似。垂直载荷会产生更多的非轴向应力，这与非分段基台在1种植入条件下施加的力有所不同。两种基台设计的直接加载结果相似。选择种植体基台和应用的具体建议应基于临床标准。

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