Gaddipati Rajasekhar, Ramisetty Sudhir, Vura Nandagopal, Kanduri Rajeev Reddy, Gunda Vinay Kumar
Department of Oral and Maxillofacial Surgery (Head: Prof. Rajasekhar Gaddipati), Mamata Dental College & Hospital, Giriprasad Nagar, Khammam, Andhra Pradesh 507002, India.
J Craniomaxillofac Surg. 2014 Oct;42(7):1102-5. doi: 10.1016/j.jcms.2014.01.038. Epub 2014 Jan 15.
Previous retrospective analyses prove that impacted mandibular third molars (M3s) increase the risk of angle fractures and decrease the risk of concomitant fractures to the condyle.
A retrospective cohort was designed for patients reported to the Department of Oral and Maxillofacial Surgery from January 2011 till June 2013. The study variables are presence or absence of third molar, if it is present, their position, classified using the Pell and Gregory system; angulation, classified using Shiller's method. The outcome variables were angle and condyle fractures.
Hospital records and panoramic radiographs were used to determine and classify these variables. The study sample comprised of 118 mandibular angle and condyle fractures in 110 patients. Database was constructed and analysed using SPSS version 10.0.
This present retrospective study concluded that the presence of impacted third molar predisposes the angle to fracture and reduces the risk of a concomitant condylar fracture. However absence of impacted third molar increases the risk of condylar fracture. The highest incidence of angle fracture was observed in position A impacted mandibular third molars. And there is no significant relationship, concerning ramus position and angulation of impacted mandibular third molars with the angle fracture.
既往回顾性分析证明，下颌阻生第三磨牙（M3）会增加下颌角骨折的风险，并降低髁突伴发骨折的风险。
对2011年1月至2013年6月间口腔颌面外科收治的患者进行回顾性队列研究。研究变量为是否存在第三磨牙，若存在，则根据佩尔和格雷戈里系统对其位置进行分类；根据席勒方法对牙倾斜度进行分类。观察变量为下颌角和髁突骨折情况。
利用医院记录和全景X线片确定并分类这些变量。研究样本包括110例患者的118处下颌角和髁突骨折。使用SPSS 10.0版构建数据库并进行分析。
本回顾性研究得出结论，下颌阻生第三磨牙的存在易导致下颌角骨折，并降低髁突伴发骨折的风险。然而，无下颌阻生第三磨牙会增加髁突骨折的风险。在下颌第三磨牙A类阻生位置观察到下颌角骨折的发生率最高。并且，下颌阻生第三磨牙的升支位置和倾斜度与下颌角骨折之间无显著关系。
