目的 比较骨性错牙合 的下前牙矢状向倾斜度和牙弓、基骨弓长度，并评估3个指标间的相关性。 方法 于治疗前收集104名骨性Ⅰ、Ⅱ、Ⅲ类错牙合 及个别正常牙合 的CBCT数据，使用MATLAB软件测量下前牙矢状向倾斜度和牙弓、基骨弓长度，分析指标间的差异及相关性。 结果 Ⅲ类错牙合 的下前牙矢状向倾斜度显著小于其余3组，牙弓、基骨弓长度大于其余3组；Ⅱ类错牙合 的下切牙矢状向倾斜度显著大于其余3组。下前牙矢状向倾斜度与相应基骨弓长度呈中度负相关（中切牙区至尖牙区的相关系数 r 分别为-0.557、-0.554和 -0.489，P<0.001），而与牙弓长度无相关性。 结论 不同骨性错牙合 的下前牙矢状向倾斜度和牙弓、基骨弓长度存在差异。通过下前牙矢状向倾斜度的大小可以评估相应基骨的矢状向发育情况，但改变下前牙矢状向倾斜度不足以影响牙弓长度。
关键词：
骨性错牙合 ; ; ； ; ; 矢状向倾斜度； ; ; 牙弓长度； ; ; 基骨弓长度
Objective To compare the sagittal inclination of anterior teeth and lengths of dental arch and basal bone arch in skeletal malocclusions and to evaluate the relevance between these three variables. Methods One hundred and four pretreatment CBCT data of subjects with skeletal Class I, II, III malocclusion and normal occlusion were collected. MATLAB software was used to measure the sagittal inclination of anterior teeth, lengths of dental arch and basal bone arch. The differences and correlation between the indexes were evaluated and analyzed. Results The sagittal inclination of anterior teeth in class III group was significantly less than in other three groups. The lengths of dental arch and basal bone arch in class III group were greater than in the other three groups. The sagittal inclination of incisors in class II group was significantly greater than in the other three groups. The sagittal inclination of anterior teeth was moderately negatively correlated with the lengths of the corresponding basal bone arch (r=-0.557,-0.554,-0.489 P<0.001), while the sagittal inclination of anterior teeth was not correlated with the length of dental arch. Conclusions There were differences in sagittal inclination of anterior teeth, lengths of dental arch and basal bone arch between different skeletal malocclusions. We can evaluate the sagittal growth of basal bone by sagittal inclination of anterior tooth. However, changing sagittal inclination of anterior tooth has little impact on the length of dental arch.
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