不同垂直骨面型骨性Ⅲ类错[牙合]颅-舌骨的平面投影关系

Effects of skeletal class Ⅲ malocclusion with different vertical facial types on the cranio-lingual plane

目的研究骨性Ⅲ类错[牙合]垂直骨面型对颅-舌骨的平面位置影响,以期为临床治疗提供指导。方法收集符合纳入标准的骨性Ⅲ类错[牙合]畸形共计186名患者的头颅侧位片影像数据,利用winceph8.0软件进行舌骨的相关数据测量,对数据进行统计学处理。结果Ⅲ类错[牙合]畸形舌骨水平距离:低角>均角>高角;Ⅲ类错[牙合]畸形舌骨垂直距离:高角>均角>低角;横纵斜率高角明显小于均角和低角,且后二者相近。垂直距离中,12岁以下组与其他年龄组的患者均有统计学意义(P<0.05)。随年龄增大,12岁以后舌骨水平和垂直位置均趋于恒定。4个年龄组之间的水平距离与斜率的值无统计学意义(P>0.05)。结论 (1)4岁以后人群,未表现舌骨的水平距离差异。垂直距离有少许生长变化,高峰期前逐渐增加至12岁左右,以后也不再随着年龄的增加变化。(2)当垂直骨面型为高角时,舌骨的垂直距离较高,下颌平面越低,水平距离呈增大趋势。

Objective To study the effect of skeletal class Ⅲ malocclusion with different vertical facial types on the cranio-lingual plane, so as to provide guidance for clinical treatment. Methods Cranial lateral imaging data were collected from 186 patients with Class Ⅲ alocclusion,and hyoid bone related data were measured using winceph 8.0 software for statistical processing. Results Horizontal distance of hyoid bone class Ⅲ malocclusion: low angle> average angle> high angle;Vertical distance of hyoid bone class Ⅲmalocclusion: high angle> average angle> low angle. The high angle of transverse and longitudinal slope was significantly smaller than that of the average angle and low angle. The latter two were close. There were statistical difference in the vertical distance between the group under 12 years old and other age groups(P<0.05). With the increasing of age, the horizontal and vertical positions of the hyoid bone tended to be constant after 12 years of age. There was no statistical difference in value of horizontal distance and slope among the four different age groups(P>0.05). Conclusions(1) There is no difference in the horizontal distance of the hyoid bone among people after 4 years of age. The vertical distance shows a little growth change,gradually increases to about 12 years old before the peak period, and no longer changes with the increasing of age.(2) When the vertical bone type is high angle, the vertical distance of the hyoid bone is higher. The lower the mandibular plane is, the larger the horizontal distance tends to.