排牙初期弓丝对牙弓形态和咬合维持作用的对比研究

目的:应用镍钛圆丝和带状弓丝作用在低位尖牙的拥挤拔牙病例上,研究带状镍钛弓丝对尖牙拥挤病例的牙弓形态和咬合的影响。方法:选择40例骨性Ⅰ类错牙合、上颌尖牙低位拥挤病例。随机分为带状弓丝组和圆丝组,拔除4颗第一前磨牙,应用带状弓丝、圆丝和活动翼矫治技术进行治疗。尖牙排齐后,对治疗前后的记存模型进行分析,观察带状弓丝对牙弓宽度和牙弓长度的影响。结果:带状弓丝组:治疗后上颌尖牙的宽度有所减小,第二前磨牙宽度有所增大,第一磨牙宽度没有变化。上颌切牙和第一磨牙到腭皱的距离均没有变化。圆丝组:治疗后上颌尖牙的宽度有所减小,第二前磨牙和第一磨牙的宽度有所增大。上颌切牙到腭皱的距离增加,第一磨牙到腭皱的距离没有变化。结论:镍钛带状弓丝联合活动翼托槽应用在尖牙低位拥挤的病例上,可以很好的维护后牙固有咬合,稳定牙合平面,控制前牙的突度,减少新畸形的发生,使正畸矫治速度增加,缩短疗程,疗效较好。

Study on the changes of dental arches used Nickel titanium flat wire in extraction crowding cases

Objective Applicating nickel titanium flat and round wire in low fangs extraction crowding cases.Researching the influence of dental arch and the occlusion. Methods 40 cases were divided into flat and round wire groups.they were low fangs crowding cases of class Ⅰ Osseous neutronclusion,extracted four first premolars, treated by nickel titanium flat and round wire and active-wing appliance.low fangs were neaarranged.Study model were analysed before and after treatment. The measurement data had statistical analysis,the effect were observed of dental arch width and length. Results Flat wire group：widths of maxillary canines decreased,The upper second bicuspid increased,The upper molar had no change.The distance maxillary incisor and molar to palatal wrinkle had no change.round wire groups：widths of maxillary canines decreased,the upper second bicuspid and upper molar increased. The distance maxillary incisor to palatal wrinkle increased.the distance molar to palatal wrinkle had no change. Conclusion Nickel titanium flat wire and activewing appliance can treat low fangs extraction crowding cases.That can adjust the morphology of dental arch,preserve the stability of functional occlusal plane,Control the incisor protrusion.reduce the new teratogenesis,decrease the speed of orthodontic treatment,short the period of treatment,Clinical curative effect is good.