Inaoka Sirius-Dan, Carneiro Suzana-Célia-de Aguiar-Soares, Vasconcelos Belmiro-Cavalcanti-do Egito, Leal Jefferson, Porto Gabriela-Granja
Oral and Maxillofacial Surgery, Restauração Hospital, Recife, Brazil.
Med Oral Patol Oral Cir Bucal. 2009 Jul 1;14(7):E349-54.
Many studies have shown that the greatest risk of fracture of the mandibular angle is related to the presence of an unerupted lower third molar, based on the hypothesis that there is a decrease in the area of bone and absorption of the impact in this area, leading some surgeons to indicate its prophylactic removal in patients most exposed to the risk factors of facial trauma. On the other hand, other authors have observed a greater frequency of condylar fractures in patients without an impacted lower third molar.
The aim of this study was to relate the condylar and angle fracture with an unerupted lower third molar, taking into account the position of the tooth.
Panoramic radiographs were used to determine if the presence or absence of the third molar is related to the occurrence of mandibular fractures, such as angle and condylar fractures.
In a total of 43 patients with angle fractures, the greatest percentage had erupted teeth, and 41.9% had impacted teeth; however there was no significant difference between the fractured side and the tooth condition (p=0.350). There were 91 condylar fractures and in 42.9% the third molar was absent and in 40.7% the tooth was erupted . There was no significant difference between the fractured side and the tooth condition (p=0.852).
The absence of an impacted third molar may increase the risk of condylar fractures and decrease the prevalence of mandibular angle fractures.
许多研究表明，下颌角骨折的最大风险与未萌出的下颌第三磨牙的存在有关，基于这样的假设，即该区域的骨面积减少且冲击力吸收减少，这导致一些外科医生建议在最易受面部创伤风险因素影响的患者中预防性拔除该牙。另一方面，其他作者观察到，在没有下颌第三磨牙阻生的患者中，髁突骨折的发生率更高。
本研究的目的是考虑牙齿位置，将髁突骨折和角部骨折与未萌出的下颌第三磨牙联系起来。
使用全景X线片来确定第三磨牙的有无是否与下颌骨折（如角部骨折和髁突骨折）的发生有关。
在总共43例角部骨折患者中，大部分患者的牙齿已萌出，41.9%的患者牙齿阻生；然而，骨折侧与牙齿状况之间无显著差异（p = 0.350）。有91例髁突骨折，其中42.9%的患者没有第三磨牙，40.7%的患者牙齿已萌出。骨折侧与牙齿状况之间无显著差异（p = 0.852）。
没有下颌第三磨牙阻生可能会增加髁突骨折的风险，并降低下颌角骨折的发生率。
