Objective:To analyse the asymmetry of mandibular of adults with skeletal classⅢmalocclusion and mandibular deviation using cone-beam computerized tomography(CBCT).Methods:20 adults with skeletal classⅢmalocclusion and mandibular deviation (deviation group)and 20 adults with individual normal occlusion(normal group)were included.CBCT slices were taken for each sub-ject.INVIVO 5 software was used to make 3D reconstruction and location marks for line distance and volume measurements of mandi-ble and condyle.Results:The measurements of the mandibular ramus length,mandibular total length,hemi-mandibular volume, mandibular ramus volume,posterior part of mandibular body length,condylar unit length,angular unit length,body unit length and an-gular angle in deviation group were significantly different between 2 sides(P<0.05).Compared with the normal group,differences of the asymmetry of mandibular ramus length,mandibular total length,hemi-mandibular volume,mandibular ramus volume,posterior part of mandibular body length,angular angle,condylar unit length and body unit length between 2 sides in deviation group were sig-nificantly different(P<0.05).Conclusion:In adults with skeletal classⅢmalocclusion and mandibular deviation deviated condylar and mandibular ramus are smaller than those of the nondeviated;the posterior part of mandibular body is slightly asymmetric while the anterior part of mandibular body is almost symmetric.%目的：用锥体束CT（CBCT）资料分析骨性Ⅲ类错！伴下颌偏斜成人患者下颌骨的形态特征。方法：纳入骨性Ⅲ类错！伴下颌偏斜的成人患者20例作为偏斜组，个别正常！20例为正常！组。进行CBCT扫描，用INVIVO 5软件对下颌骨进行三维重建，定位标记点，对测量值进行统计分析。结果：正常！组两侧测量值无统计学差异（P＞0．05）。偏斜组中偏斜侧下颌升支长度、体积、下颌骨总长度、体积、下颌体后半部分长度、髁突单位、下颌角与下颌体的单位长度均小于对侧（P＜0．05），偏斜侧下颌角的角度大于对侧，其余结果无统计学差异（P＞0．05）。偏斜组2侧各项的差值与正常！组相比均有统计学意义（P＜0．05），其余结果无统计学差异（P＞0．05）。结论：骨性Ⅲ类错！伴下颌偏斜侧的髁突与下颌升支小于对侧；下颌体的后部轻度不对称；下颌体前半部分两侧基本对称。
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