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目的:评价下颌J钩高位牵引配合改良多曲方丝弓技术矫治以下颌发育过度为主的安氏Ⅲ类骨性错的疗效。方法:选取符合纳入标准的7名恒牙期以下颌发育过度为主的骨性Ⅲ类错患者,行下颌J钩高位牵引结合改良多曲方丝弓技术治疗,对治疗前、上多曲方丝弓前、治疗结束后X线头颅侧位片进行测量分析比较。结果:上前牙在前期排齐整平阶段进一步唇倾代偿;在下颌J钩高位牵引结合多曲方丝使用后,下颌磨牙远中移动及远中竖直明显,下前牙内收明显,上前牙唇倾度未见明显变化,下颌骨向下向后旋转;矫治结束后覆盖及磨牙关系发生了显著变化。结论:应用下颌J钩高位牵引结合改良多曲方丝弓技术矫治恒牙期以下颌发育过度为主的骨性Ⅲ类错则更有针对性,且切实可行。
OBJECTIVE: To evaluate the effect of mandibular J hook high traction combined with modified multi-curve arch wire technique in the treatment of Class Ⅲ skeletal malformations with overactive mandibular overgrowth. Methods: Seven patients with skeletal Class Ⅲ malocclusion with mandibular overgrowth, which met the inclusion criteria, were selected and treated with high J - hook traction combined with modified multifilar arch wire arch technique. Before and after treatment, Before the square wire arch, after treatment, X-ray cephalograms were measured and compared. Results: The upper anterior teeth in the early stage of leveling leveling further lip compensation; the J hook high in the jaw combined with the use of multi-bend square wire, the mandibular molars move in the distal and vertical obvious, lower anterior adductor obvious, on the There was no obvious change of inclination of anterior lip, the mandible rotated backwards and downwards, and the relationship between overlay and molars changed significantly after correction. Conclusion: It is more practical and feasible to treat skeletal class Ⅲ malocclusion with permanent mandibular overgrowth in permanent dentition by using the J - hook high position traction combined with modified polygonal arch wire technique.