Aslan Belma Işik, Dinçer Müfide
Department of Orthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
Eur J Orthod. 2008 Feb;30(1):80-8. doi: 10.1093/ejo/cjm095.
The aim of this prospective study was to evaluate the dentofacial effects of the reciprocal mini-chin cup (RMCC) appliance in subjects with pubertal growth and development potential (group 1) and in subjects that had completed this period (group 2). Eighteen patients (13 females, five males) with an Angle Class II division 1 and nine patients (six females, three males) with a Class II division 2 malocclusion, with mandibular dentoalveolar retrusion and optimal vertical facial dimension were included. A control group consisting of 14 subjects (nine females, five males) with pubertal growth and development potential was constructed for comparison with group 1. In both treatment groups a RMCC was used. A Class I molar relationship was achieved in an average period of 5.11 months in group 1 and 10.57 months in group 2. From lateral cephalometric tracings, beside the angular and linear parameters, eight parameters that determined the ratio of the skeletal and dental effects of RMCC were measured and statistically evaluated. A paired comparison t-test was used to assess the differences in each group and a Student's t text to evaluate the differences between the groups. In both groups, no effect of RMCC was found on either the maxilla and/or the sagittal position of the mandible. In group 1, lower anterior face height was increased more compared with group 2; the mandibular plane angle increased and the mandible developed mostly in the vertical dimension. While a Class I molar relationship and correction of the overbite and overjet were achieved in both groups, a greater correction of overjet was found in group 1. Retrusion of the upper incisors without extrusion, protrusion, or proclination of the lower incisors, distalization of the upper molars, mesialization and extrusion of the lower molars and mesialization of the mandibular dentoalveolar structures were observed in both groups. Contributions to the correction of overjet and molar relationship were mostly dentoalveolar in both groups.
这项前瞻性研究的目的是评估反向迷你颏兜（RMCC）矫治器对具有青春期生长发育潜力的受试者（第1组）和已完成该时期的受试者（第2组）的牙颌面影响。纳入了18例安氏II类1分类患者（13例女性，5例男性）和9例安氏II类2分类错牙合患者（6例女性，3例男性），这些患者均存在下颌牙牙槽后缩且垂直面部比例最佳。构建了一个由14名具有青春期生长发育潜力的受试者（9例女性，5例男性）组成的对照组，用于与第1组进行比较。两个治疗组均使用RMCC矫治器。第1组平均在5.11个月内实现了I类磨牙关系，第2组则为10.57个月。从侧位头影测量描记图中，除了角度和线性参数外，还测量并统计评估了8个决定RMCC骨骼和牙齿效应比例的参数。采用配对比较t检验评估每组内的差异，采用学生t检验评估两组之间的差异。在两组中，均未发现RMCC对上颌骨和/或下颌骨的矢状位置有影响。在第1组中，与第2组相比，下前牙面部高度增加更多；下颌平面角增大，下颌骨主要在垂直方向发育。虽然两组均实现了I类磨牙关系以及覆盖和覆牙合的矫正，但第1组的覆盖矫正程度更大。两组均观察到上切牙后移而无下切牙的伸长、前突或前倾，上磨牙远中移动，下磨牙近中移动和伸长以及下颌牙牙槽结构近中移动。两组中对覆盖和磨牙关系矫正的贡献主要是牙牙槽性的。
