上颌前方牵引器矫治骨性Ⅲ类错（牙合）畸形的临床研究

Correction of skeletal class Ⅲ malocclusion with maxillary protraction

目的 观察利用前方牵引器矫治骨性上颌骨发育不足的Ⅲ类错（牙合）患者的效果.方法 对30例替牙期的骨性上颌骨发育不足的Ⅲ类错（牙合）患者,佩戴面具式前方牵引装置,口内带环托式活动矫治器,疗程平均1年.治疗前后采用X线头影测量并进行统计学分析,通过观察颌面部硬组织及软组织侧貌的变化,判断前方牵引的治疗效果.结果 所有患者均解除了前牙反（牙合）,上颌骨均有不同程度地向前、向下生长,SNA角显著增大;上、下颌骨间关系失调得到改善;软组织侧貌改变明显.结论 前方牵引器对早期骨性Ⅲ类错（牙合）畸形的矫治效果显著,降低了患者日后正颌手术的概率.

Objective To investigate the effects of skeletal class Ⅲ malocclusion with maxillary protraction. Methods Thirty patients at period of replaced teeth with skeletal class m malocclusion were treated by maxillary protraction appliance, pretreament and postreatment cephalometric analysis were carried out. Average treatment time was 12 months. The effects were judged by observing the changes of soft and hard tissues. Resuits Anterior crossbite malocclusion on all cases was relieved with forward-downward growth of maxillae and remarkable enlarged SNA angle ; the disharmony of jaw to jaw relationship improved ; the appearance of the soft tissue was also improved. Conclusion The maxillary protraction could obtain a striking effectiveness on correction of skeletal class Ⅲ malocclusion and reduce the probabilities of orthognathic surgery.