FRⅢ型矫治器矫治安氏Ⅲ类错后舌骨位置的对比研究

The position of hyoid bone after treatment of class Ⅲ malocclusion with FRⅢ appliance in children

目的:比较FRⅢ型矫治器矫治儿童安氏Ⅲ类错畸形前后舌骨位置的变化。方法:选取儿童安氏Ⅲ类错患者20例及正常儿童20例,对患者矫治前后的X线头影测量片上的舌骨位置进行对比,并与正常者X线头影测量片上的舌骨位置进行对比分析。结果:功能性安氏Ⅲ类错组矫治前舌骨位置较正常组在舌骨垂直向测量项目中H-FH、H-S、H-Mp距明显减小(P<0.01);在水平向H-Ptm距减小(P<0.05),H-RGn距无显著性改变(P>0.05);Ar-H-Me角度明显增大(P<0.01)。矫治后舌骨位置较正常组H-Mp距明显减小(P<0.01)、Ar-H-Me角度增大(P<0.05),H-FH、H-S、H-Ptm、H-RGn距无显著性改变(P>0.05)。矫治前、后舌骨位置的对比:H-FH、H-S距明显增大(P<0.01),H-Ptm距有增大(P<0.05),Ar-H-Me角度减小(P<0.05),H-Mp、H-RGn距无显著性改变(P>0.05)。结论:经FRⅢ型矫治器矫治后的儿童安氏Ⅲ类错患者的舌骨位置与治疗前相比,位置更靠后、靠下,下颌骨与舌骨位置发生了顺时针旋转。

Objective： To compare changes of hyoid bone position before and after treatment of Angel Class Ⅲ malocclusion with FRⅢ appliance in children.Methods： 20 patients with Angle Class Ⅲ malocclusion at the average age of 9.5 years were treated with FRⅢ appliance,the hyoid bone position was analyzed before and after treatment by X-ray film,20 children with normal occlusion were enrroled as the controls.Results： Before treatment,in the vertical the hyoid bone measurements of functional Class Ⅲ malocclusion compared with those of normal occlusion group the H-FH,H-S and H-Mp were significantly lower（P0.01）;in the horizontal H-Ptm was lower（P0.05）;in the horizontal direction there was no significant difference in H-RGn（P0.05）;in angle measurements Ar-H-Me increased significantly（P0.01）;After treatment of functional Class III malocclusion compared with normal occlusion group,H-Mp was significantly lower（P0.01）,Ar-H-Me was increased（P0.05）;and there was no significant difference in H-FH,H-S,H-Ptm and H-RGn（P0.05）.After treatment H-FH and H-S were increased significantly（P0.01）,H-Ptm was increased（P0.05）,Ar-H-Me was lower（P0.05）,and there was no significant change in H-Mp and H-RGn（P0.05）.Conclusion： After FRⅢ treatment of children with Class Ⅲ malocclusion,the hyoid bone position may move rearward and downward,mandibular and hyoid position may clockwise rotat.