摘要： 目的: 利用椎形束CT（CBCT）及全景片观察下颌管及其分支在下颌第三磨牙区域的情况。方法：对179名患者的216颗第三磨牙进行CBCT及全景片检查。在全景片及CBCT上观察下颌管及其分支在第三磨牙区域走向及与第三磨牙的关系。结果：全景片上观察到有4例下颌管有分支，CBCT观察到有22例有分支；下颌管分支与第三磨牙的关系：A类有8例，B类有6例，C类有2例，D类有6例，其中，分支位于第三磨牙颊侧的有7例，舌侧的有6例，位于第三磨牙牙根下方的有9例。结论：利用CBCT可以对下颌管及下颌第三磨牙的空间位置进行更好地观察。CBCT对下颌管分支有更高的检出率。

关键词: 下颌管； 下颌管分支； 下颌第三磨牙； 全景片, 椎形束CT（CBCT）

Abstract: 　Objective: To observe the applied anatomy of mandibular canal（MC） and braches in mandibular third molar（MTM） region by CBCT and panoramic radiography. Methods: 179 patients with 216 MTMs undertaken panoramic radiography and CBCT were retrospectively reviewed. Yamada classification was used to record the anatomic relationship of MC and MTM. Result: 4 cases with branch of mandibular canal were detected in panoramic radiographs and 18 cases with branch were detected by CBCT. There were 8 cases in type A, 6 cases in type B, 2 cases in type C, and 6 cases in type D. Meanwhile, there were 7cases that branches located at the buccal side of third molar, 6 cases at the lingual side, and 9 cases below the root of third molar. Conclusion: When we want to bring the important anatomical structures into view, CBCT 3-D images are useful and better than panoramic radiography.

Key words: mandibular canal, mandibular canal branches, mandibular third molar, panoramic radiographs, CBCT

中图分类号: 

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• R445