缩窄型下颌角并低位阻生智齿拔除的临床分析(附5例报告)

目的：探讨下颌角缩窄病例与拔牙并发下颌骨骨折的关系。方法：5例缩窄型下颌角并低位阻生智齿，1例拔牙术中引起下颌骨骨折，结合文献分析引起骨折的原因，预防措施及治疗。结果：该病例因劈冠并发下颌角骨折是由于下颌角缩窄，下颌角解剖结构薄弱所致。对此类病例行拔牙术应以高速涡轮牙钻破冠去除冠阻力或分根拔除。结论：下颌角缩窄增加了拔除智齿时并发骨折的风险，术前摄全颌曲面断层片，进行个性化手术设计对于预防骨折并发症意义重大。

Therapy of 5 cases of narrow mandibular angle with lower impacted third molar

Objective:To explore the relationship between anatomy of narrow mandibular angle and mandibular fracture after the third molar extraction. Method:5 cases of narrow mandibular angle with lower impacted wisdom teeth removal were investigated,one of which was catagmatic. We analysised the possible etiologies,ways of prevention and treatment of fracture induced by dental extraction. Result:Mandibular fracture of this case was resulted from narrow mandibular angle. Conclusion:Narrow mandibular is a risky factor of fracture during third molar extraction,therefore,taking panoramic radiograph,as well as the design of treatment programmes while preoperation is very important to preventing this type of fracture.