不同骨面型成人颏部软组织厚度的CBCT初步研究

Preliminary study on chin soft tissue thickness of adults with different skeletal patterns using CBCT

目的利用CBCT结合Dolphin Imaging 11.0软件对不同骨面型成人颏部软组织厚度进行探讨研究。方法选择拍摄CBCT影像的骨性Ⅰ类、骨性Ⅱ类、骨性Ⅲ类患者各20例,利用Dolphin Imaging 11.0图像分析软件进行三维重建,并对重建后的3D图像进行定位,建立三维参考系,定位硬组织颏前点(Po)、软组织颏前点(Pos)的三维坐标等,利用公式计算颏部软组织厚度即(Po-Pos)之间的距离及在各个坐标轴上的差异。结果颏部软组织厚度在骨性Ⅰ类、骨性Ⅱ类、骨性Ⅲ类的男、女性别间无统计学差异(P>0.05),颏部软组织厚度计算数值在骨性Ⅰ类、骨性Ⅱ类、骨性Ⅲ类未发现显著性差异,但在三维坐标系中,硬组织颏前点Po(x1,y1,z1)在Z轴上骨性Ⅰ类与骨性Ⅱ类和骨性Ⅱ类与骨性Ⅲ类存在显著性差异(P<0.05),在X轴的线距上,骨性Ⅰ类与骨性Ⅲ类、骨性Ⅱ类与骨性Ⅲ类之间存在显著性差异(P<0.05)。结论不同骨面型人群颏部软组织厚度在三维坐标系中存在一定差异,主要体现在水平面上的差异,硬组织颏前点在冠状面上骨性Ⅰ类与骨性Ⅱ类和骨性Ⅱ类与骨性Ⅲ类间有一定的差异,这对正畸治疗的临床诊断、治疗计划的制定等提供一定的参考价值。

Objective To discuss the chin soft tissue thickness of adults with different skeletal patterns. Methods All the subjects were divided into three groups according to different skeletal patterns and each group included 20 patients. The images were constructed into 3-dimensional （3D） model using medical image processing software Dolphin Imaging 11.0. The reference planes were established and the two points, pogonion of hard tissue （Po） and soft tissue （Pos） were located on the 3 D model. The chin soft tissue thickness was calculated statistically. Results There was no gender difference in terms of the chin soft tissue thickness （P 〉 0.05） and it was not affected by skeletal patterns. The coordinate of it was affected by the skeletal patterns （class Ⅰ and class Ⅱ ,class Ⅱ and classⅢ ）. There were significant differences in the z coordinate of point Po （P 〈 0.05,class I and class Ⅲ ; class Ⅱ and class Ⅲ ）. Conclu- sions The chin soft tissue thickness of different skeletal patterns showed significant differences and the differences existed in the hori- zontal plane primarily. There were significant differences in Point Po between class Ⅰ and class Ⅱ ,class Ⅱ and class m ,which would provide guidance for the diagnosis and orthodontic treatment.