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目的:探讨采用口外弓单侧推磨牙向远中矫治安氏Ⅱ类亚类错的临床效果。方法:选择恒牙列早期安氏Ⅱ类亚类错病例15例。年龄9～12岁,上颌第二磨牙尚未萌出,头影测量大致正常。取成品对称口外弓,在Ⅱ类磨牙关系一侧,在口外弓的内弓套入螺旋推簧,施加200 g力推磨牙远移。Ⅰ类咬合关系一侧,将内弓弯成U形,起到平衡作用。为防止磨牙移动,整排牙列连续结扎。结果:推磨牙远移的时间4～7个月,平均5.5个月。磨牙远移距离3.5 mm～6.0 mm,平均远移4.4 mm(即0.8 mm/每月)。磨牙远移结束后,II类磨牙关系改变成I类咬合关系,原来I类关系侧基本不变。磨牙远移到位后,再装配直丝弓矫治器完成矫治。结论:口外弓配合螺簧单侧推磨牙向远中,可顺利完成对安氏II类亚类错牙合的矫治,疗效满意。
Objective: To investigate the clinical effect of using unilateral molars with molars to correct distal Class Ⅱclass division malocclusion. Methods: Fifteen cases of Class Ⅱclass of skeletal Class Ⅱ malocclusions in the early stage of permanent dentition were selected. Aged 9 to 12 years old, the maxillary second molar has not erupted, cephalometric measurements generally normal. Take the finished symmetrical mouth outside the bow, in the relationship between the type Ⅱ molar side, bow in the mouth of the bow set into the spiral spring, exert a force of 200 g molars to move away. Ⅰ type occlusal relationship side, the bow will be bent into a U-shaped, play a balancing role. In order to prevent molars from moving, the entire row of teeth row ligation. Results: The time to push molars was 4 to 7 months, an average of 5.5 months. Molar distance moved 3.5 mm ~ 6.0 mm, the average remote 4.4 mm (ie 0.8 mm / month). Molar far after the end of the relationship, type II molars changed into a type I occlusal relationship, the original side of the relationship I basically unchanged. Molar far in place, and then assembly straight wire appliance to complete orthodontic treatment. CONCLUSIONS: The unilateral extracapsular bow with spiral spring can move the molar one way to the far, and the correction of Class II subclass malocclusion can be successfully completed. The curative effect is satisfactory.