【摘要】 目的:评价应用片段弓技术结合上颌微螺钉支抗配合III类颌间牵引非拔牙矫治单纯前牙拥挤的临床效果。方法:12例单纯前牙拥挤病例,应用片段弓技术,上颌颧下嵴微螺钉支抗配合III类牵引拉后牙段向远中,待间隙足够时排齐前牙,对矫治前后的模型及X线头颅侧位片进行测量分析。结果:U1/SN、U1/NA、L1/NB和IMPA均无明显变化,结论:后牙片段弓结合上颌微螺钉支抗可以在保持前牙唇倾度不变甚至轻度内收的情况下排齐拥挤的牙列。更多还原

【Abstract】 Objective:To evaluate the clinical effects of maxillary mini-screw anchorage and Class III elastics on non-extraction treatment of anterior crowding.Method:12 cases of anterior crowding were treated with segmental arch technique and Mini-screws were inserted into the maxillary infrazygomatic crest(IZC) area to pull the posterior segment distally,class III traction was used to the distal movement of mandibular posterior teeth.Anterior teeth were aligned until adequate space of front segment was obtained.Model and cephalometric X ray film were examined before and after treatment.Result:The width of upper and lower arch was increased significantly.No significant changes were seen on the angles of U1/SN,U1/NA,L1/NB and IMPA.Conclusion:To those anterior crowding cases,application of segmental arch technique combination with maxillary micro-screw anchorage and Class III traction can correct the crowing when the torque of anterior teeth was maintained.The method is suitable for mild to moderate skeletal type I crowding cases.更多还原