中国南方人腭中缝的锥形束CT分期和骨密度比率的特点分析

目的:研究中国南方地区不同年龄阶段腭中缝的锥形束CT（CBCT）分期及不同分期下腭中缝骨密度比率的特点,以期为腭开展提供评价依据。方法:从2014—2017年中南大学湘雅口腔医院发育正常的患者中,筛选出符合纳入标准的患者113例,年龄4~36岁。所得CBCT影像资料采用Angelieri分型法将腭中缝分为A、B、C、D、E期,并用Chad Evans Larson骨密度比率计算方法测量每例患者的CBCT腭中缝骨密度值。采用SPSS 22.0软件包对各年龄腭中缝骨密度比率平均值和不同分期腭中缝骨密度比率的平均值分别行单因素方差分析及LSD检验。结果:不同年龄段同一分期（同为B期或C期或D期）各组的骨密度比率平均值之间无显著差异（P>0.05）。 C、D期骨密度比率平均值在15~18岁组和18岁以上组均有显著差异（P<0.05）;A期与B期之间、D期与E期之间的骨密度比率值无显著差异（P>0.05）。腭中缝分期处于A与C、A与D、A与E、B与C、B与D、B与E、C与D、C与E之间骨密度比率值有显著差异（P<0.05）。结论:15岁以下儿童腭中缝分期处于A、B、C期,腭中缝骨密度比率显著低于其他年龄组。腭中缝分期为C期的患者,年龄分布于11~18岁,骨密度比率在组内无显著差异,但相比A、B期较大,相比D、E期较小,差异具有显著性（P<0.05）。

Cone-beam CT study of the characteristics of midpalatal suture at different age groups in a southern China population

PURPOSE: The purpose of this cone-beam CT (CBCT) based study was to investigate the stages of palatal suture at different age groups as well as the bone density of the palatal suture in a south Chinese population. METHODS: The CBCT data of 113 patients with an age range from 4 to 36 years old were selected. All of them were reported to have normal growth. CBCT image data were selected in accordance with the inclusion criteria. By using Angelieri method, the palate was divided into 5 groups, and Chad Evans Larson bone density ratio was calculated for each patient. One-way ANOVA and LSD analysis were used to evaluate the average bone density ratio of the mid-palatal at each age stage as well as the mean value of palatal suture bone density at different stages with SPSS 22.0 software package. RESULTS: By comparing the density ratio of mid-palatal suture for each age group, no significant difference was noticed for the same stage regardless of the age (stage B, C and D) (P>0.05), significant difference was noticed between C and D(P<0.05),no significant difference was noticed for the suture density between group A and B as well as group C and D (P>0.05), significant difference was found for the suture density between A/C, A/D, A/E, B/C, B/D, B/E, C/D, and C/E groups(P<0.05). CONCLUSIONS: The mid-palatal suture density in children under 15 years may belong to stage A, B or C , which is significantly lower than group D and E; Patients of a palatal stage C stay within an age range from 11 to 18. No inner group difference is noticed inside group C. The average suture density of group C is significantly larger than group A and B, whereas smaller than group D and E. The results showed that CBCT can be a useful tool to guide rapid mid-palatal expansion in clinical practice. Patients who have a lower density mid-palatal suture can be expanded.