目的：应用CBCT对下颌骨双下颌管情况进行观察和研究，统计其发生概率，为下颌后牙区种植及下颌第三磨牙拔除提供参考。方法：收集2012—2014年上海市第六人民医院口腔科就诊病人200例，征得患者同意登记个人信息并拍摄CBCT。观察患者有无双下颌管，描述其走行特征并进行统计学分析。结果：双下颌管发生率为29.5%，并发现三分支下颌管2例。下颌管分支根据走行方向分成3类：磨牙管、颊舌侧管、前行管。其中磨牙管发生率为20%，颊舌侧管发生率为8%，前行管发生率72%。结论：经CBCT观察发现，双下颌管有较高发生率，在下颌后区进行种植术等各种手术治疗前应拍摄CBCT，警惕双下颌管的存在，防止严重并发症的发生。%Objective: To explore the anatomical features of multiple mandibular canals using cone-beam computed to-mography (CBCT) and evaluate its practical reference in dental implantology and orthognathic surgery. Methods: This study was comprised of 200 patients from 2012 to 2014 in Shanghai Sixth Peoples' Hospital. Patients were fully informed consent. CBCT was performed to observe the anatomical variations of mandibular nerve canal. Describing its characteris-tics of traveling and analyzed statistically. Results: 59 cases (29.5%) of bifid mandibular canals were observed, and two cases showed three manifold mandibular nerve canals. According to the running directions, mandibular canals could be di-vided into 3 categories:retromolar canal, buccal and lingual canal, forward canal. The most frequently encountered type of bifid mandibular canal was the forward type (72%), followed by retromolar type (20%) and buccal and lingual type (8%). Conclusion: CBCT observation revealed a higher prevalence of bifid mandibular canals. Mandibular surgery shall be in alert to avoid mandibular nerve injuries.
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