Department of Oral and Maxillofacial Surgery, Universal College of Medical Sciences, Bhairahawa, Nepal.
Department of Conservative Dentistry and Endodontics, Universal College of Medical Sciences, Bhairahawa, Nepal.
Dent Traumatol. 2021 Feb;37(1):103-107. doi: 10.1111/edt.12608. Epub 2020 Oct 4.
Previous studies have shown that the position and presence of mandibular third molars is associated with a high risk of mandibular angle fractures. The aim of this study was to assess the relationship between the position and presence of mandibular third molars and mandibular angle fractures.
A retrospective study consisting of 256 patients who were admitted for treatment of mandibular fractures between January 2016 and January 2018 was undertaken. Patients' data and orthopantomogram radiographs were obtained from their medical record. The predictor variable was the presence and position of mandibular third molars. The position of the third molars was grouped based on the Pell and Gregory classification. The outcome variable was the presence of an angle fracture. Other study variables included age, gender, mechanism of injury, and fracture location.
Patients with mandibular third molars had a 2.7 times greater chance of an angle fracture than patients without third molars. Patients with their third molars present at occlusal position C and ramus position level 3 had a higher risk of angle fracture in comparison with other groups. There was a statistically significant variation in the risk of an angle fracture, depending on mandibular third molar position (P < .001).
Patients with mandibular third molars have an increased risk of angle fractures. The risk for an angle fracture varied depending on the third molar position.
先前的研究表明，下颌第三磨牙的位置和存在与下颌角骨折的高风险有关。本研究旨在评估下颌第三磨牙的位置和存在与下颌角骨折之间的关系。
回顾性研究纳入了 2016 年 1 月至 2018 年 1 月期间因下颌骨骨折而接受治疗的 256 名患者。从他们的病历中获取患者数据和全景 X 光片。预测变量为下颌第三磨牙的存在和位置。根据 Pell 和 Gregory 分类法对第三磨牙的位置进行分组。结果变量为角部骨折的存在。其他研究变量包括年龄、性别、损伤机制和骨折部位。
有下颌第三磨牙的患者发生角部骨折的几率是没有第三磨牙的患者的 2.7 倍。与其他组相比，下颌第三磨牙处于咬合位 C 和升支位 3 的患者发生角部骨折的风险更高。角部骨折的风险存在统计学显著差异，取决于下颌第三磨牙的位置（P<.001）。
有下颌第三磨牙的患者发生角部骨折的风险增加。角部骨折的风险取决于第三磨牙的位置。
