目的：探讨利用锥形束CT（Cone Beam Computed Tomography，CBCT）评价青少年骨性Ⅲ类错患者下前牙区牙槽骨高度的可重复性，为正畸方案设计及复诊提供指导。方法使用CBCT对66例青少年患者进行扫描，其中男32例，女34例，按垂直骨面型分为3类，每类22例，分别为低角骨面型（22例）、均角骨面型（22例）、高角骨面型（22例），在图像上重复测量下前牙区目标牙位根尖点至牙槽嵴顶的距离，并使用SPSS 19.0软件进行统计学分析。结果 CBCT图像上对根尖点至牙槽嵴顶的距离重复测量结果在3类患者下中切牙间差异无统计学意义，而CBCT图像上下颌中与侧切牙间、侧切牙与尖牙间牙槽骨高度的测量结果在不同垂直骨面型中差异有统计学意义（P<0.05），随着骨面型的增高牙槽骨高度在逐渐降低。结论 CBCT图像可以清晰显示牙在牙槽骨内的空间位置关系，对下前牙区牙槽骨高度的测量结果具有可重复性，能够为临床正畸方案设计及复诊提供指导和理论依据。%Objective To discuss the repeatability of application of Cone-Beam Computed Tomography (CBCT) in evaluation of mandibular anterior alveolar bone height measurement in adolescents with skeletal ClassⅢ malocclusion.Methods66 cases of skeletal ClassⅢ (male 32 and female 34) who were scanned by using CBCT were divided into 3 groups respectively according to different vertical facial types, with 21 patients in each group: 21 cases with low-angle skeleton malocclusion III, 21 cases with average-angle,21 cases with high-angle. The measurement of heights of mandibular anterior alveolar bones was made and the data were analyzed statistically by using SPSS 19.0 software.ResultsThree groups of patients had no statistically signiifcant difference in heights of the middle incisor alveolar bone. The heights of alveolar bones between mandibular central incisors and lateral incisors as well as those between mandibular lateral incisors and canine teeth had signiifcant differences between low-angle and high-angle, average-angle and high-angle,P<0.05. Along with the bone surface increased, the alveolar bone height gradually reduced.Conclusion The CBCT images can demonstrate the three-dimensional relationships between booth and alveolar bone. CBCT shows good repeatability in measurement of alveolar bone height so as to provide guidance for clinical orthodontic scheme design and assessment and theoretical basis.
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