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目的 :借助X线头影测量 ,评价多曲方丝弓技术矫治骨性Ⅲ类反前后牙、面可能的改变 ,并阐明其矫治机制。方法 :选择轻度或中度骨性反患者 2 0例 ,采用 0 56mm× 0 .71mm的标准方丝弓托槽完成矫治 ,矫治前后分别摄定位侧位片。结果 :矫治后上中切牙水平前移 ( 3 72± 0 .80 )mm ,压低 ( 2 .89± 0 2 8)mm ;下中切牙水平后移 ( 1 31± 0 4 1)mm ,伸长 ( 2 10± 0 2 5)mm ;上第一磨牙水平前移 ( 1 31±1 2 0 )mm ,伸长 ( 0 .98± 0 19)mm ;下第一磨牙水平后移 ( 2 .53± 1 4 0 )mm ,伸长 ( 1.10± 0 63)mm ;SNA增大( 0 68± 0 2 3)° ,SNB减少 ( 1.83± 0 52 )° ,FMA增大 ( 1 50± 0 2 3)° ,下唇珠突距减少 ( 3 19± 0 .84 )mm ,OP MP增大 ( 7 4 0± 0 50 )°。结论 :该技术矫治骨性反的机制主要为牙 牙槽的掩饰作用且伴有少量上颌基骨的前移 ;在平面有效控制的前提下 ,获得下磨牙的直立和后移。
OBJECTIVE: To evaluate the possible changes of dental and palatal face of the skeletal Class Ⅲ anti-反 by means of X-ray cephalometry and to evaluate the correction mechanism. Methods: Twenty patients with mild or moderate bony stomachache were selected. The standard archwire brackets with 0 56mm × 0.71mm were used to complete the treatment. The lateral radiographs were taken before and after treatment. Results: After correction, the level of the upper incisors moved forward (3.72 ± 0.80) mm and decreased (2.89 ± 0.28) mm respectively. The level of the lower incisors moved forward (31 ± 0 4 1) mm, (2 10 ± 0 2 5) mm; the first molars moved forward (1 31 ± 1 2 0) mm and elongated (0 .98 ± 0 19) mm; (53 ± 140) mm and elongation (1.10 ± 0 63) mm respectively; SNA increased (0 68 ± 0 2 3) °, SNB decreased (1.83 ± 0 52) °, FMA increased (3 19 ± 0.84) mm, OP MP increased (74 0 ± 0 50) °. Conclusion: The mechanism of orthodontic treatment of skeletal ridges is mainly the masking effect of alveolar groove accompanied with the advancing of a small amount of maxillary base bone. Under the premise of effective control of plane, the vertical and posterior shift of the lower molars are obtained.