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目的 :比较FRⅢ型矫治器矫治功能性和早期骨性安氏Ⅲ类错治疗前、后硬组织的变化。方法 :选择30例功能性和早期骨性安氏Ⅲ类错患者,采用FRⅢ型矫治器矫治,利用SPSS22.0软件包对矫治前、后X线头影测量项目进行t检验。结果:FRⅢ型矫治器矫治前、后,SNA、S-Ptm、ANS-Ptm、Go-Po无显著改变(P>0.05)。ANB、ANS-Me、ANS-Me/N-Me显著增大(P<0.01),SNB、L1-NB角、L1-MP显著减小(P<0.05),MP-FH、Y轴角、U1-NA角、U1-NA距、U1-SN显著增大(P<0.05)。结论:经FRⅢ型矫治器矫治后的安氏Ⅲ类错患者,下颌骨的位置发生了向下、向后的顺时针旋转,下切牙舌倾,上切牙唇倾。
OBJECTIVE: To compare the changes of hard tissue before and after treatment of FR Ⅲ type orthodontic appliance and early skeletal Class Ⅲ malocclusion. Methods: Thirty patients with functional and early skeletal Class Ⅲ malocclusion were selected and treated with FR Ⅲ appliance. The software SPSS22.0 was used to perform t-test on the items before and after X-ray treatment. Results: There was no significant change in SNA, S-Ptm, ANS-Ptm and Go-Po before and after FR Ⅲ appliance treatment (P> 0.05). ANB, ANS-Me and ANS-Me / N-Me were significantly increased (P <0.01), SNB, L1-NB angle and L1-MP were significantly decreased -NA angle, U1-NA distance, U1-SN increased significantly (P <0.05). Conclusion: The patients with Angle Ⅲ malocclusion treated by FR Ⅲ appliance have mandibular position rotated downward and backward clockwise.