定制和非定制接骨板在模拟下颌前突整形术中的力和变形应力。
Force and deformation stresses in customized and non-customized plates during simulation of advancement genioplasty.
机构信息
Department of Dental Materials and Restorative Dentistry, São Leopoldo Mandic Institute and Dental Research Center, Rua José Rocha Junqueira 13, Bairro Swift, Campinas, SP 13045-755, Brazil.
Centro de Tratamento da Face, Estrada dos Três Rios 200 bloco 1/211, Freguesia, Jacarepaguá, RJ 22755-002, Brazil.
出版信息
J Craniomaxillofac Surg. 2017 Nov;45(11):1820-1827. doi: 10.1016/j.jcms.2017.08.021. Epub 2017 Aug 31.
PURPOSE
The aim of this study was to evaluate the distribution of deformation stresses in customized and non-customized plates during simulated advancement genioplasty, using the finite element method.
METHODS
A customized plate (Traumec) was developed with 4.75 mm advancement, in ASTM F67 Grade 2 titanium, with four screws. Non-customized (standard) plates with 6 mm advancement (Stryker with six screws and Osteomed with four screws) were used for comparison. All the screws presented the same length (10 mm) and fixation system (2.0). The Traumec and Osteomed plates were fixed with two screws in the mandible, and another two in the segment, whereas the Stryker plate was fixed with three screws in the mandible, and another three in the segment. Six virtual models were generated in a computer-aided design program (Rhinoceros), in which the advancement and insertion of the plates were evaluated. All the plates were submitted to application of perpendicular and oblique forces of 5 N in the chin region.
RESULTS
The Osteomed plate showed the highest stress value (1506 MPa), and the Traumec, the lowest stress value (560.20 MPa). The Stryker plate showed higher stress values for the segment screws than for the mandibular screws, unlike the other plates.
CONCLUSIONS
The customized Traumec plate showed better deformation stress distribution and plate/segment stabilization when submitted to advancement genioplasty.
目的
本研究旨在使用有限元法评估模拟推进性下颌前突整形术中定制和非定制接骨板的变形应力分布。
方法
采用 ASTM F67 级 2 型钛制成具有 4.75mm 推进的定制接骨板（Traumec），带有四个螺钉。使用 6mm 推进的非定制（标准）接骨板（Stryker 六螺钉和 Osteomed 四螺钉）进行比较。所有螺钉的长度（10mm）和固定系统（2.0）相同。Traumec 和 Osteomed 接骨板在颏部固定两个螺钉，在节段固定另外两个螺钉，而 Stryker 接骨板在颏部固定三个螺钉，在节段固定另外三个螺钉。在计算机辅助设计程序（Rhinoceros）中生成了六个虚拟模型，评估了接骨板的推进和插入情况。所有接骨板均在颏部施加垂直和斜向 5N 的力。
结果
Osteomed 接骨板的应力值最高（1506MPa），Traumec 接骨板的应力值最低（560.20MPa）。Stryker 接骨板的节段螺钉的应力值高于下颌螺钉，而其他接骨板则相反。
结论
在进行推进性下颌前突整形术中，定制的 Traumec 接骨板表现出更好的变形应力分布和接骨板/节段稳定性。
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