替牙期儿童下颌骨发育的三维特征  

The three-dimensional characteristic of mandibular growth in children with mixed dentition

作　　者：潘思思[1] 王昕 戴微微[1] 王剑锋[1] 陈文静[3] 胡荣党[1] 

机构地区：[1]温州医科大学附属口腔医院正畸科,浙江温州325027 [2]玉溪中医医院口腔科,云南玉溪653100 [3]南京医科大学附属口腔医院正畸科,江苏南京210029

出　　处：《温州医学院学报》2014年第10期712-717,共6页Journal of Wenzhou Medical College

基　　金：浙江省新苗人才计划项目(2012R413056);温州市科技计划项目(Y20140129)

摘　　要：目的：采用锥形束CT（CBCT）研究替牙期儿童的下颌骨发育情况,探讨该时期下颌骨整体发育的趋势。方法：对140例6～12周岁替牙期儿童拍摄CBCT图像,使用Dolphin Imaging 11.0软件进行下颌骨三维重建,测量分析包括下颌骨长度、下颌骨宽度等15项线距和6项角度。结果：6~8周岁替牙早期组60例与9～12周岁替牙晚期组80例进行横向比较,发现替牙晚期组数值较替牙早期组增加,其中左侧下颌骨长度（Co L-Gn）[（7.29±0.7）mm]、右侧下颌骨长度（Co R-Gn）[（8.00±0.9）mm]、髁突间距（Co L-Co R）[（3.29±0.8）mm]、喙突间距（Cor L-Cor R）[（4.76±0.7）mm]、乙状切迹间距（Sg L-Sg R）[（5.11±0.6）mm]、下颌角间距（Go L-Go R）[（4.83±0.7）mm]、颏孔间距（Mf0L-Mf0R）[（1.65±0.4）mm]、颏孔近颊点间距（Mf1L-Mf1R）[（1.16±0.4）mm]、颏孔远颊点间距（Mf2L-Mf2R）[（2.39±0.4）mm]、颏孔远舌点间距（Mf2’L-Mf2’R）[（1.42±0.6）mm]、左侧下颌体长度（Go L-Gn）[（5.80±0.8）mm]、右侧下颌体长度（Go R-Gn）[（6.95±0.7）mm]、左侧下颌支高度（Co L-Go L）[（4.40±0.5）mm]、右侧下颌支高度（Co R-Go R）[（4.33±0.6）mm]、左侧下颌角（Co L-Go L-Gn）[（3.75±0.4）°]、右侧下颌角（Co R-Go R-Gn）[（5.18±0.3）°]、髁突开张度（Co L-Gn-Co R）[（0.62±0.28）°]、喙突开张度（Cor L-Gn-Cor R）[（0.68±0.3）°]、乙状切迹开张度（Sg L-Gn-Sg R）[（0.59±0.27）°],差异均有统计学意义（P〈0.05）。颏孔近舌点间距（Mf1’L-Mf1’R）几乎不变,下颌角开张度增加（0.32±0.4）°,差异无统计学意义（P〉0.05）。结论：替牙晚期下颌骨各部分长宽高均有所增加（除颏孔近舌点间宽度）,不同部位骨组织的增加量不同,下颌骨水平向宽度变化由前至后呈增大趋势,颏孔近中部位下颌骨宽度的增加主要由下颌骨外侧面增生新骨引起,下颌骨整体发育趋势为向下向�Objective： To analyze the three-dimensional characteristics of mandibular growth of the chil-dren with mixed dentition by Cone Beam Computed Tomography and discuss the whole trend of mandibular growth. Methods： Cone Beam Computed Tomography scans were performed in 140 subjects from 6 to 12 years old with mixed dentition. CT images were constructed into 3D model using medical image processing software Dolphin Imaging 11.0. Fifteen linear and six angular measurements including mandibular length, mandibular width, etc, were positioned through MPR method and analyzed by SPSS 17.0. Results： Transverse comparison in 6-8 years old for early age group of 60 cases with 9-12 years old for late age group of 80 cases, the measured values were significantly increased in the late age group, including the left mandibular length [（7.29±0.7） mm], the right mandibular length [（8.00±0.9） mm], the condyle spacing [（3.29±0.8） mm], coronoid spacing [（4.76±0.7） mm], sigmoid notch spacing [（5.11±0.6） mm], mandibular angle spacing [（4.83±0.7）mm], mental foramen spac- ing [（1.65±0.4） mini, mental foramen mesial buccal point spacing [（1.16±0.4） mm], mental foramen distal buc- cal point spacing [（2.39±0.4） mm], mental foramen distal tongue point spacing [（1.42±0.6） mm], the left corpus length [（5.80±0.8） mm], the right corpus length [（6.95±0.7） mm], the left ramus height [（4.40±0.5） mm], the right ramus height [（4.33±0.6） mm], left mandibular angle [（3.75±0.4） °], right mandibular angle [（5.18±0.3） °], condylar strength [（0.62±0.28）°], coracoid strength [（0.68±0.3）°] and sigmoid notch strength [（0.59±0.27） °] significantly （P〈0.05）. The inner side of mental foramen mesial almost unchanged and mandibular angle strength increased [（0.32±0.4） °], both had no significant difference （P〉0.05）. Conclusion： Mandibular dimensions are in- creased in the late age group （except mental foramen mesial tongue point width）, the

关 键 词：锥形束计算机体层摄影术 三维测量 下颌骨 发育 

分 类 号：R783.5[医药卫生—口腔医学]