Chiqueto Kelly, Henriques José Fernando Castanha, Barros Sérgio Estelita Cavalcante, Janson Guilherme
FOB-USP.
Dental Press J Orthod. 2013 Jan-Feb;18(1):35-44. doi: 10.1590/s2176-94512013000100011.
To assess the effects produced by the MARA appliance in the treatment of Angle's Class II, division 1 malocclusion.
The sample consisted of 44 young patients divided into two groups: The MARA Group, with initial mean age of 11.99 years, treated with the MARA appliance for an average period of 1.11 years, and the Control Group, with initial mean age of 11.63 years, monitored for a mean period of 1.18 years with no treatment. Lateral cephalograms were used to compare the groups using cephalometric variables in the initial and final phases. For these comparisons, Student's t test was employed.
MARA appliance produced the following effects: Maxillary growth restriction, no change in mandibular development, improvement in maxillomandibular relationship, increased lower anterior facial height and counterclockwise rotation of the functional occlusal plane. In the upper arch, the incisors moved lingually and retruded, while the molars moved distally and tipped distally. In the lower arch, the incisors proclined and protruded, whereas the molars mesialized and tipped mesially. Finally, there was a significant reduction in overbite and overjet, with an obvious improvement in molar relationship.
It was concluded that the MARA appliance proved effective in correcting Angle's Class II, division 1 malocclusion while inducing skeletal changes and particularly dental changes.
评估MARA矫治器治疗安氏II类1分类错牙合的效果。
样本包括44名年轻患者，分为两组：MARA组，初始平均年龄11.99岁，使用MARA矫治器治疗平均1.11年；对照组，初始平均年龄11.63岁，未接受治疗，监测平均1.18年。使用头颅侧位片，通过头影测量变量比较两组的初始和最终阶段。这些比较采用学生t检验。
MARA矫治器产生了以下效果：上颌生长受限，下颌发育无变化，上颌与下颌关系改善，下前部面部高度增加，功能性牙合平面逆时针旋转。在上颌弓，切牙舌向移动并后缩，磨牙远中移动并远中倾斜。在下颌弓，切牙前倾并前突，磨牙近中移动并近中倾斜。最后，覆盖和覆牙合明显减小，磨牙关系明显改善。
得出结论，MARA矫治器在矫正安氏II类1分类错牙合的同时能引起骨骼变化尤其是牙齿变化，证明是有效的。
