Department of Oral & Maxillofacial Surgery, Manipal College Of Dental Sciences, Manipal Academy Of Higher Education, Manipal, Karnataka, India.
Department of Oral Medicine & Radiology, Manipal College Of Dental Sciences, Manipal Academy Of Higher Education, Manipal, Karnataka, India.
Dent Traumatol. 2019 Jun;35(3):188-193. doi: 10.1111/edt.12468. Epub 2019 Apr 3.
BACKGROUND/AIMS: Angle fractures represent the largest percentage of mandibular fractures. They pose as a unique entity because of their codependent morphological dynamic factors, rendering the understanding of the mechanism, and treatment challenging. The aim of this study was to analyze the association between the mandibular gonial angle and the risk of mandibular angle fracture while highlighting its clinical relevance.
A retrospective analysis of radiographs of patients treated for mandibular fractures was done. The factors studied were as follows: the presence of a high gonial angle and an impacted third molar. The outcome was mandibular angle fracture. The gonial angle was measured using Planmeca Digital Software 3.7.0.R. Status of the third molar was also noted. Data obtained were analyzed using SPSS 22 (IBM Corp, Armonk, NY).
The sample comprised 70 mandibular fractures (32 angle fractures and 38 non-angle fractures). The mean gonial angle in the angle fracture group was 128.5 ± 5.4º which was 10.2° larger than in the non-angle group (mean 118.5 ± 4.4º; P = 0.0001). Patients with a high gonial angle were 8.7 times more likely to sustain an angle fracture than those with normal or low gonial angles. A statistically significant relationship between the presence of impacted third molar and patients sustaining mandibular angle fractures was noted (P = 0.0001).
Subjects with a high gonial angle and an impacted third molar are at an increased risk for mandibular angle fracture due to direct and indirect morphological factors.
背景/目的：角部骨折占下颌骨骨折的最大比例。由于其形态学动态因素的相互依存，它们构成了一个独特的实体，这使得理解其机制和治疗方法具有挑战性。本研究旨在分析下颌角拐点与下颌角骨折风险之间的关系，并强调其临床相关性。
对接受下颌骨骨折治疗的患者的 X 光片进行回顾性分析。研究的因素如下：存在高拐点和阻生第三磨牙。结果是下颌角骨折。使用 Planmeca Digital Software 3.7.0.R 测量拐点角度。还注意到第三磨牙的状态。使用 SPSS 22（IBM 公司，纽约州阿蒙克）分析获得的数据。
样本包括 70 例下颌骨骨折（32 例角部骨折和 38 例非角部骨折）。角部骨折组的平均拐点角度为 128.5 ± 5.4°，比非角部组大 10.2°（平均 118.5 ± 4.4°；P = 0.0001）。拐点角度高的患者发生角部骨折的可能性是拐点角度正常或低的患者的 8.7 倍。存在阻生第三磨牙与下颌角骨折患者之间存在统计学显著关系（P = 0.0001）。
拐点角度高和第三磨牙阻生的患者由于直接和间接的形态学因素，下颌角骨折的风险增加。
