摘要/Abstract
摘要： 目的 · 通过锥形束 CT（ cone-beam computed tomography，CBCT）影像结合三维重建测量技术，比较成年骨性Ⅲ类错 伴下
颌偏斜患者偏斜侧和非偏斜侧第一磨牙代偿及其周围牙槽骨形态的差异。方法 · 选择正畸治疗前成年骨性Ⅲ类错 伴下颌偏斜患者
56 例，基于 CBCT 影像结合 Mimics 10.0 和 3-Matic 软件测量两侧第一磨牙颊舌向、近远中向倾角、冠根比、牙槽骨或松质骨厚度；
采用配对样本 t 检验比较偏斜侧与非偏斜侧的差异。结果 · 偏斜侧下颌第一磨牙（下 6）颊舌向倾角和下 6 冠根比显著大于非偏斜侧
（P=0.021，P=0.004），偏斜侧下 6 颊侧松质骨厚度和下 6 总松质骨厚度显著小于非偏斜侧（P=0.043，P=0.048）。两侧下 6 颊侧松质骨
厚度 / 下 6 总松质骨厚度的比值比较，差异无统计学意义（均 P=0.118）。两侧上颌第一磨牙及其周围牙槽骨形态的测量指标比较，差
异无统计学意义（均 P>0.05）。结论 · 骨性Ⅲ类错 伴下颌偏斜患者第一磨牙存在明显的颊舌向代偿，但其在牙槽骨中的位置是对称
的；第一磨牙周围牙槽骨形态的不对称主要表现在下颌偏斜侧颊侧及总松质骨厚度的减少。
关键词: &ensp, 锥形束 CT；骨性Ⅲ类错 伴下颌偏斜；第一磨牙；牙槽骨形态
Abstract:
Objective · To compare the difference of the first molar and alveolar morphology between the deviated side and non-deviated side in skeletal class Ⅲ patients with mandibular deviation by using cone-beam computed tomography (CBCT) image combined with three-dimensional reconstruction measurement technology. Methods · Fifty-six asymmetric CBCT data were evaluated by Mimics 10.0 and 3-Matic software. Some measures were analyzed by t-test including the buccolingual angle, the mesiodistal angle, crown root ratio of first molar and the thickness of alveolar or cancellous bone. Results · The buccolingual angle and crown root ratio of mandibular first molar were significantly larger on the deviated side than on the non-deviated side (P=0.021, P=0.004). Compared with the non-deviated side, the buccal and total cancellous bone thickness of mandibular first molar were significantly smaller on the deviated side (P=0.043, P=0.048). There was no significant difference in the ratio of buccal and total cancellous bone thickness on mandibular first molar (both P=0.118). The measurements of maxillary first molar and maxillary alveolar bone morphology were not significantly different between two sides (all P>0.05). Conclusion · In skeletal class Ⅲ patients with mandibular deviation, although the buccolingual compensation of first molar is found, the position of first molar in the alveolar bone is symmetrical. The asymmetry of alveolar bone morphology are mainly manifested in the reduction of the buccal and total cancellous bone thickness on the mandibular deviated side.
Key words: cone-beam computed tomography (CBCT), skeletal class Ⅲ patients with mandibular deviation, the first molar, alveolar bone morphology
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