Department of Oral and Maxillfacial Surgery, Istanbul University Faculty of Dentistry, İstanbul-Turkey.
Ulus Travma Acil Cerrahi Derg. 2022 Jun;28(6):715-722. doi: 10.14744/tjtes.2022.59447.
Bicortical screws (lag and positional) or miniplates with monocortical screws are generally used for the rigid fixa-tion of the sagittal split ramus osteotomy (SSRO) in maxillofacial surgery. However, in this osteosynthesis method, the plate must be perfectly adapted to the bone to prevent misalignment of the bone segment and occlusal changes. In addition, it is necessary to prevent the position of the condyle in the mandibular fossa from changing after fixation. In recent years, locked miniplate systems have been used to overcome these complications.
The aim of this study is to compare the commonly used 2.0 mm standard miniplate/screw systems and 2.0 mm locking miniplate/screw systems in fresh sheep jaws with Obwegeser-Dal Pont (OD) and Hunsuck-Epker (HE) modifications, by evaluating standard parameters.
Our study consists of two main groups and two subgroups. 40 sheep hemimandibulae were randomly divided into two main groups. Each group was randomly divided into two subgroups. There are ten hemimandibulae (n=10) in each subgroup. Linear force test was applied using 4-hole standard miniplate and 4-hole locking miniplate systems on sheep jaws with 5 mm advancement by applying OD and HE techniques, which are two frequently preferred modifications in SSRO. For statistical analysis SPSS® 16.0 (Sta-tistical Package for the Social Sciences, SPSS Inc. Chicago, Illinois, USA) package program was used. It was statistically compared with the 95% confidence interval using the Pearson coefficient, and p<0.05 was interpreted as significant. The values of the loading forces applied to the samples in the groups were subjected to analysis of variance (ANOVA) to confirm the normality of the sample. Multiple comparisons were made between groups using the Tukey test. The mean loadings in the groups were analyzed by one-way ANOVA.
In general, as the strength of the force increases, the displacement values increase in all groups, but although it was observed that the locked miniplate/screw system was more stable than the standard miniplate/screw system, no statistically significant difference was found.
在颌面外科中，通常使用双皮质螺钉（拉力和位置）或单皮质螺钉的微型板来固定矢状劈开下颌支截骨术（SSRO）。然而，在这种骨合成方法中，钢板必须与骨骼完美适配，以防止骨段错位和咬合变化。此外，有必要防止固定后下颌窝中髁突的位置发生变化。近年来，已使用锁定微型板系统来克服这些并发症。
本研究旨在通过评估标准参数，比较常用的 2.0mm 标准微型板/螺钉系统和 2.0mm 锁定微型板/螺钉系统在 Obwegeser-Dal Pont（OD）和 Hunsuck-Epker（HE）改良的新鲜羊颌骨中的性能。
我们的研究包括两个主要组和两个亚组。40 只羊下颌骨随机分为两组。每组再随机分为两个亚组。每个亚组有 10 个下颌骨（n=10）。通过 OD 和 HE 技术，在下颌骨上施加 5mm 的前进，用 4 孔标准微型板和 4 孔锁定微型板系统对羊下颌骨进行线性力测试，这是 SSRO 中两种常用的改良方法。为了进行统计分析，使用了 SPSS®16.0（社会科学统计软件包，SPSS Inc.，美国伊利诺伊州芝加哥）软件包程序。使用 Pearson 系数在 95%置信区间内进行了统计学比较，p<0.05 被解释为有统计学意义。对组内样本施加的加载力值进行方差分析（ANOVA），以确认样本的正态性。使用 Tukey 检验进行组间的多重比较。对各组的平均载荷进行单因素方差分析。
总的来说，随着力的强度增加，所有组的位移值都增加，但尽管观察到锁定微型板/螺钉系统比标准微型板/螺钉系统更稳定，但没有发现统计学上的显著差异。
