Ugboko V I, Oginni F O, Owotade F J
Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, College of Health Sciences, Obafemi Awolowo University, Ile-Ife, Nigeria.
Br J Oral Maxillofac Surg. 2000 Oct;38(5):427-9. doi: 10.1054/bjom.2000.0312.
We examined the relationship between the presence or absence of mandibular third molars and angle fractures in Nigerians between January 1976 and July 1997. Information was obtained from patients' case records and radiographs.A total of 490 patients were seen during the study period, 408 of whom (83%) had their third molars present, and 76 of whom had angle fractures. Road traffic accidents (n =304, 62%) were the main cause of the fractures. Of these, 44 (14%) had angle fractures compared with 14/75 (19%) patients in whom the mechanism of injury was a fight or assault.Sixty-five of the 408 patients whose third molars were present (16%) had angle fractures, as did 11/82 (13%) who did not have third molars (p =0.57). Of the 77 patients whose lower third molars were not erupted, 24 (31%) had angle fractures compared with 52/331 (16%) in whom the lower third molars were erupted (p =0.002). These findings suggest that angle fractures are uncommon in this population because of their particular mechanism of injury. In addition, the presence of a lower third molar does not necessarily predispose to fractures of the angle of the mandible. However, angle fractures are more likely to occur in people with unerupted lower third molars than in those in whom they have erupted.
我们研究了1976年1月至1997年7月期间尼日利亚人下颌第三磨牙的有无与下颌角骨折之间的关系。信息来自患者的病例记录和X光片。在研究期间共诊治了490例患者，其中408例（83%）有第三磨牙，76例有下颌角骨折。道路交通事故（n = 304，62%）是骨折的主要原因。其中，44例（14%）有下颌角骨折，而受伤机制为打架或袭击的患者中有14/75（19%）发生下颌角骨折。有第三磨牙的408例患者中有65例（16%）发生下颌角骨折，无第三磨牙的82例患者中有11例（13%）发生下颌角骨折（p = 0.57）。在77例下颌第三磨牙未萌出的患者中，24例（31%）发生下颌角骨折，而下颌第三磨牙已萌出的患者中有52/331（16%）发生下颌角骨折（p = 0.002）。这些发现表明，由于其特殊的受伤机制，下颌角骨折在该人群中并不常见。此外，下颌第三磨牙的存在不一定会导致下颌角骨折。然而，下颌角骨折在未萌出下颌第三磨牙的人群中比在已萌出下颌第三磨牙的人群中更易发生。
