Iida Seiji, Nomura Kimiko, Okura Masaya, Kogo Mikihiko
First Department of Oral and Maxillofacial Surgery, Osaka University Graduate School of Dentistry, Osaka, Japan.
J Trauma. 2004 Sep;57(3):613-7. doi: 10.1097/01.ta.0000096647.36992.83.
Several studies have shown an increased risk of mandibular angle fractures by the presence of the lower third molar (M3), especially the incompletely erupted M3. The presence of M3s might influence condylar fractures, which is one of the most common fracture sites, as well as the angle fracture.
Six hundred ninety-two mandibular sides among 346 patients with mandibular fracture were analyzed. They were classified into two groups according to the presence of incompletely erupted M3s and were analyzed according to fracture site, age, and cause of injury.
Among these patients with mandibular fractures, the frequency of occurrence of the mandibular angle fracture was higher in the group with incompletely erupted M3s (p < 0.0001) and that of the condylar fracture was higher in the group without it (p < 0.001).
The result of this retrospective investigation shows that an incompletely erupted M3 decreases the risk of condylar fractures and increases the risk of mandibular angle fractures.
多项研究表明，下颌第三磨牙（M3）的存在会增加下颌角骨折的风险，尤其是未完全萌出的M3。M3的存在可能会影响髁突骨折（最常见的骨折部位之一）以及角部骨折。
对346例下颌骨骨折患者的692侧下颌骨进行分析。根据未完全萌出的M3的存在情况将其分为两组，并根据骨折部位、年龄和受伤原因进行分析。
在这些下颌骨骨折患者中，未完全萌出的M3组下颌角骨折的发生率较高（p < 0.0001），而无未完全萌出的M3组髁突骨折的发生率较高（p < 0.001）。
这项回顾性研究的结果表明，未完全萌出的M3会降低髁突骨折的风险，并增加下颌角骨折的风险。
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