Influence of the mandibular plane and magnitude of the movement in sagittal split ramus osteotomy: an in vitro study.

Oral and maxillofacial surgery Pub Date : 2022-12-01 Epub Date: 2022-01-10 DOI:10.1007/s10006-021-01024-z

Gleysson Matias de Assis, Victor Diniz Borborema Dos Santos, Salomão Israel Monteiro Lourenço Queiroz, Adriano Rocha Germano

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Abstract

Purpose: The aim of this study was to evaluate fixation resistance in mandibular sagittal split ramus osteotomy in standardized polyurethane hemimandibles with two types of advancement (6 and 12 mm), with or without mandibular plane rotation, using a 2.0-mm plate/screw system.

Methods: Seven groups were evaluated using a vertical compressive load in the first molar region, and the applied force in Newtons was recorded in 1 mm, 5 mm, and 10 mm displacements, as well as the maximum force.

Results: There was a statistical intergroup difference and it was observed that increasing the advancement decreased fixation resistance with a single plate, and inserting an additional plate significantly increased osteosynthesis resistance.

Conclusion: In the 12 mm advancements, clockwise rotation proved to be more resistant when fixed with only one plate. By contrast, counterclockwise rotation was significantly more resistant in stabilizing the mandibular sagittal ramus osteotomy when two plates were used.

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矢状分叉支截骨术中下颌平面和运动幅度的影响:一项体外研究。

目的:本研究的目的是评估使用2.0 mm钢板/螺钉系统，采用两种推进类型(6和12 mm)的标准化聚氨酯半下颌骨矢状分叉支截骨术，在下颌平面旋转或不旋转的情况下，固定阻力。方法:在第一磨牙区施加垂直压缩载荷，以牛顿为单位记录1 mm、5 mm和10 mm位移的施加力以及最大施加力。结果:组间差异有统计学意义，单钢板内固定阻力增加，单钢板内固定阻力降低，单钢板内固定阻力明显增加。结论:在12 mm的推进中，单钢板固定时，顺时针旋转阻力更大。相反，当使用两个钢板时，逆时针旋转在稳定下颌矢状支截骨时明显更有阻力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Oral and maxillofacial surgery

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