Patil Pavan M
School of Dental Sciences, Plot 32 & 34, Knowledge Park 3, Sharda University, Greater Noida 201308, Uttar Pradesh, India.
Br J Oral Maxillofac Surg. 2012 Jul;50(5):443-6. doi: 10.1016/j.bjoms.2011.06.002. Epub 2011 Jul 20.
Our aim was to assess the influence of the presence and state of impaction of mandibular third molars on the incidence of fractures of the mandibular angle and condyle. We designed a retrospective study of patients who presented for the treatment of mandibular fractures from January 2006 to April 2011. The independent variables were the presence and degree of impaction of lower third molars, and the outcome variables were the incidence of fractures of the mandibular angle and condyle. The information was acquired from hospital records and panoramic radiographs. Personal data included age, sex, mechanism of injuries, and number of fractures of the mandibular angle and condyle. We studied 110 fractures of the mandibular condyle and 80 of the angle. The incidence of fractures of the mandibular angle was higher in the group with incompletely erupted third molars (37/80, p<0.001) and that of condylar fractures was higher in the group without (67/110, p<0.001). An incompletely erupted third molar reduces the risk of condylar fractures and increases the risk of fractures of the mandibular angle.
我们的目的是评估下颌第三磨牙的存在及其阻生状态对下颌角和髁突骨折发生率的影响。我们设计了一项回顾性研究，研究对象为2006年1月至2011年4月因下颌骨骨折前来治疗的患者。自变量为下颌第三磨牙的存在情况和阻生程度，因变量为下颌角和髁突骨折的发生率。信息从医院记录和全景X线片获取。个人数据包括年龄、性别、损伤机制以及下颌角和髁突骨折的数量。我们研究了110例下颌髁突骨折和80例下颌角骨折。在下颌第三磨牙未完全萌出的组中，下颌角骨折的发生率更高（37/80，p<0.001），而在没有下颌第三磨牙的组中，髁突骨折的发生率更高（67/110，p<0.001）。下颌第三磨牙未完全萌出会降低髁突骨折的风险，并增加下颌角骨折的风险。
