两种下颌骨三维重叠方法的对比分析  

A comparison of two three-dimensional superimposition methods of mandible

作　　者：楼曼丽 欧阳楚红 林秋平 林界伟 谢永健 薛静宜 许跃 陈瑶[3] 

机构地区：[1]深圳市南山区蛇口人民医院,518000 [2]中山大学光华口腔医学院·附属口腔医院广东省口腔医学重点实验室,广州510055 [3]广州开发区医院口腔科,510730

出　　处：《国际医药卫生导报》2016年第1期9-15,共7页International Medicine and Health Guidance News

基　　金：广东省自然科学基金资助项目（2015A030313179）;广东省卫生厅科研基金项目（A2013580）

摘　　要：目的比较不同下颌骨三维影像重叠方法的可重复性和稳定性，为建立下颌骨在生长发育中的形态变化定量测量方法提供理论依据。方法收集1名生长发育期男性志愿者正畸治疗前后（时间相隔2年）的两次头颅部CBCT扫描资料，利用Dicom数据重建下颌骨三维影像，分别利用颏联合和骨性下颌联合中点两种方法进行治疗前后图像重叠比较。由2名实验者采取上述两种方法重叠下颌骨、确定骨性标志点、计算治疗前后对应标志点的距离，并重复30次。采用F-test检验方差齐性比较两种重叠方法的可重复性，用t-test比较相应标志点距离的平均数验证两种重叠方法的稳定性。结果同一标志点在相同实验者不同次试验中的差异无统计学意义（P〉0．05）；实验者采取下颌颏联合重叠时，能产生更稳定下颌骨标志点坐标值（P〈0．05）；在不同实验者测量结果中，下颌骨治疗前后相应标志点的平均距离采用下颌颏联合重叠时差异更小，且具有统计学意义（P〈0．05）。结论利用下颌颏联合和骨性下颌联合中点进行下颌骨重叠的两种方法中，前者具有更高的可重复性和稳定性，适宜用于下颌骨生长发育形态学研究。Objective To compare the reproducibility and reliability of two three-dimensional （3D） imaging superimposition methods, and to provide the theoretical basis for quantitative assessment of biological changes of mandible during development and growth. Methods Skull CBCT scanning datasets of one male volunteer during development and growth were acquired, including the pre- and post-treatment sets （with interval of two years）, and the Dicom format images were utilized to reconstruct the 3D mandibular models, then mandibles before and after orthodontic treatment were registered and compared by symphysis menti and center of chin. Two experimenters registered the mandibles, located anatomic landmarks, and measured distances of corresponding landmarks 30 times with two superimposition methods respectively. The equality of variance was tested by F-test to compare the reproducibility of two superimposition methods, and mean distances of corresponding landmarks from the means were compared by t-test to elucidate the reliability of two methods. Results No statistical difference was found by the same experimenter to locate the same landmark at different trials （P〉0.05）. More reliable landmark values could be obtained by the symphysis menti superimposition method （P〈0.05）. The mean distances of corresponding landmarks before or after orthodontic treatment between the two experimenters showed less variances in symphysis menti superimposition method （P〈0.05）. Conclusions Between the two superimposition methods, the symphysis menti superimposition is of higher reproducibility and reliability, suggesting which is of suitability for study on growth morphology of mandible.

关 键 词：下颌骨 三维重叠 可重复性 稳定性 

分 类 号：R783.5[医药卫生—口腔医学]