双阻板磁力功能矫治器矫治早期骨性Ⅲ类错

The Treatment of Early Skeletal Angle’s Class Ⅲ Malocclusion with the Twin-block Magnetic Appliance

目的探讨双组板磁力功能矫治器矫治青春生长发育期骨性Ⅲ类错的机理.方法选择11例青春生长发育期骨性Ⅲ类错的患者,使用双组板磁力功能矫治器矫治进行矫治.对矫治前后患者的X线头颅侧位片进行分析.结果位明显改变,磁块间距增大4～6 mm,SNA增大3.150,A点向前移位;PP-SN有所减小,MP-SN FMA有所增大;1-SN有所增大.矫治前后经统计学检验,差异有统计学意义(P<0.05).结论双阻板磁力功能矫治器用于矫治早期骨性Ⅲ类错取得良好疗效;位变化是颌骨和牙弓反应的共同结果,但以颌骨反应为主;双阻板磁力功能矫治器可使上颌骨逆时针,下颌骨顺时针方向旋转,在临床上应注意正确使用.

Objective To investigate the effect of the twin-block magnetic appliance on the treatment of early skeletal Angle’s class Ⅲmalocclusion.Methods 11 young patients with early skeletal Angle’s class Ⅲ malocclusion were selected and treated with twin-block magnetic appliance.Pretreatment and posttreatment cephalometric analysis was carried out.Results There was obvious change on the occlusion position,the distance between the two magnetic blocks increased 4～6 mm,SNA increased 3.15 mm,A point moved forward;PP-SN reduced while MP-SN FMA and 1-SN increased.There was significant difference after treatment by statistical test.Conclusions The twin-block magnetic appliance has good effects in the treatment of early skeletal Angle’s class Ⅲmalocclusion;The alteration of the intermaxillary relationship is the result of skeletal and dental reaction,but mainly due to the skeletal response;The twin-block magnetic appliance can make maxilla rotate counterclockwise while make mandible rotate clockwise,so it should be used correctly.