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首页> 外文期刊>The Journal of Prosthetic Dentistry >Three-dimensional finite-element analysis of functional stresses in different bone locations produced by implants placed in the maxillary posterior region of the sinus floor.
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Three-dimensional finite-element analysis of functional stresses in different bone locations produced by implants placed in the maxillary posterior region of the sinus floor.

机译：放置在窦底上颌后区的植入物产生的不同骨骼位置的功能性应力的三维有限元分析。

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STATEMENT OF PROBLEM: Implants placed in the posterior maxilla have lower success rates compared to implants placed in other oral regions. Inadequate bone levels have been suggested as a reason for this differential success rate. PURPOSE: The purpose of this study was to determine the amount and localization of functional stresses in implants and adjacent bone locations when the implants were placed in the posterior maxilla in proximity to the sinus using finite element analysis (FEA). MATERIAL AND METHODS: A 3-dimensional finite element model of a maxillary posterior section of bone (Type 3) was used in this study. Different bony dimensions were generated to perform nonlinear calculations. A single-piece 4.1x10-mm screw-shaped dental implant system (ITI solid implant) was modeled and inserted into atrophic maxillary models with crestal bone heights of 4, 5, 7, 10, or 13 mm. In some models the implant penetrated the sinus floor. Cobalt-Chromium (Wiron 99) was used as the crown framework material placedonto the implant, and porcelain was used for occlusal surface of the crown. A total average occlusal force (vertical load) of 300 N was applied at the palatal cusp (150 N) and mesial fossa (150 N) of the crown. The implant and superstructure were simulated in finite element software (Pro/Engineer 2000i program). RESULTS: For the porcelain superstructure for bone levels, maximum von Mises stress values were observed on the mesial fossae and palatal cusp. For the bone structure, the maximum von Mises stress values were observed in the palatal cortical bone adjacent to the implant neck. There was no stress within the spongy bone. High stresses occurred within the implants for all bone levels. CONCLUSION: The maximum von Mises stresses in the implants were localized in the neck of implants for 4- and 5-mm bone levels, but for 7-, 10-, and 13-mm bone levels more even stresses occurred within the implants.
机译：问题陈述：与放置在其他口腔区域的植入物相比，放置在上颌后牙的植入物成功率较低。骨水平不足已被认为是差异成功率的原因。目的：本研究的目的是使用有限元分析（FEA）确定将植入物放置在靠近窦的后上颌骨中时植入物和邻近骨骼位置中功能性应力的大小和位置。材料与方法：本研究使用了上颌骨后段（3型）的三维有限元模型。生成了不同的骨骼尺寸以执行非线性计算。对单件式4.1x10毫米螺钉形牙科植入物系统（ITI实体植入物）进行建模，并将其插入顶骨高度为4、5、7、10或13毫米的萎缩上颌模型中。在某些模型中，植入物穿透窦底。钴铬合金（Wiron 99）被用作植入物上的牙冠框架材料，瓷器被用作牙冠的咬合面。在牙冠的the尖（150 N）和中窝（150 N）施加了300 N的总平均咬合力（垂直载荷）。在有限元软件（Pro / Engineer 2000i程序）中模拟了植入物和上部结构。结果：对于骨水平的瓷上部结构，在中窝和尖处观察到最大的冯·米塞斯应力值。对于骨骼结构，在邻近种植体颈部的the皮质骨中观察到最大的冯·米塞斯应力值。海绵骨头内没有压力。对于所有骨水平，植入物内均发生高应力。结论：对于4mm和5mm骨水平，植入物的最大冯米塞斯应力位于植入物的颈部，但是对于7mm，10mm和13mm骨水平，甚至更大的应力发生在植入物内。

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