Aymach Zaher, Nei Hitoshi, Kawamura Hiroshi, Bell William
Department of Maxillofacial Surgery, Graduate School of Dentistry, Tohoku University, Aoba-ku, Sendai, Japan.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2011 Jan;111(1):58-63. doi: 10.1016/j.tripleo.2010.03.028. Epub 2010 Jun 26.
The purpose of this study was to biomechanically evaluate the stability of a T-shaped miniplate fixation of a modified sagittal split ramus osteotomy (MSSRO) with buccal step and to compare it with single or double-parallel straight miniplates fixing a standard sagittal split ramus osteotomy (SSRO).
Eighteen Synbone mandibular replicas were used in the study and divided into 3 groups. Standard SSRO was applied in the first and second groups, and the third group was cut for MSSRO with buccal step. After 7 mm of advancement, fixation modalities for the 3 groups included a single straight miniplate, double-parallel straight miniplates, and a T-shape miniplate, respectively. Each model was secured in a jig and subjected to vertical load on the anterior teeth.
The T miniplate group showed a significantly higher value for stability than the group with a single straight miniplate. There was no significant difference in stability between the T miniplate and the double-parallel straight miniplate groups.
For mandibular advancement surgery of 7 mm in a laboratory environment, a T-shaped miniplate used with MSSRO and buccal step as a combination significantly optimize the resistance and stability of the fixation compared with a standard SSRO fixed with a single straight miniplate.
本研究旨在对改良矢状劈开下颌支截骨术（MSSRO）颊侧台阶的T形微型钢板固定的稳定性进行生物力学评估，并将其与固定标准矢状劈开下颌支截骨术（SSRO）的单平行或双平行直微型钢板进行比较。
本研究使用了18个Synbone下颌骨复制模型，并将其分为3组。第一组和第二组采用标准SSRO，第三组进行带颊侧台阶的MSSRO截骨。前移7mm后，3组的固定方式分别为单直微型钢板、双平行直微型钢板和T形微型钢板。每个模型固定在夹具中，并在前牙施加垂直载荷。
T形微型钢板组的稳定性值显著高于单直微型钢板组。T形微型钢板组和双平行直微型钢板组之间的稳定性无显著差异。
在实验室环境中进行7mm下颌前移手术时，与用单直微型钢板固定的标准SSRO相比，将T形微型钢板与MSSRO及颊侧台阶联合使用可显著优化固定的抗力和稳定性。
