磨牙竖直器矫正下第二磨牙近中倾斜阻生

Application of Molar Uprightor in the Treatment of Mesially Impacted Mandibular Second Molars

目的:设计一种用于矫正下颌第二磨牙近中倾斜阻生的专用矫正器并观察其疗效。方法:根据矫正此类畸形所需的力学体系设计一种专用矫正器——环框式磨牙竖直器。该矫正器主要由以下3个部分构成:双侧基牙带环、舌侧弓、带结扎丝栓结区的环框。使用时将环框式磨牙竖直器用粘结剂粘固就位在患者的下牙列上。然后在近中倾斜阻生的下第二磨牙牙冠的适当位置上粘结牵引钮。在该牵引钮与竖直器的拉钩之间放置弹性链圈进行牵引,牵引力约200g,每2周更换1次弹性链圈直至患牙被扶正。选择下颌第二磨牙近中倾斜阻生的病例共7列,其中双侧下第二磨牙近中倾斜阻生5例,单侧下第二磨牙近中倾斜阻生2例。分别制作并戴用环框式磨牙竖直器进行矫正。结果:所有病例的患牙都获得了扶正,平均疗程4个月,未出现支抗丧失的情况。结论:环框式磨牙竖直器可以高效地矫正下颌第二磨牙近中倾斜阻生。

Objective：To design a new type of appliance to upright the impacted mandibular second molars and observe the clinical effects.Methods：The looped molar retractor（LMR）had three components：bands,lingual arch,and loop with silver solding spurs and ligature regions.LMR was fabricated and used in the treatment of 5cases with bilateral impacted mandibular second molar and 2cases with unilateral impacted mandibular second molars.The clinical effects were observed and evaluated.Results：All the impacted second molars were up-righted successfully in short time.The average period of treatment was 4months.The loss of anchorage was not observed.Conclusion：LMR is an ideal tool to up-right the impacted inclined second molar.