Ranta R
Department of Pedodontics and Orthodontics, University of Helsinki, Finland.
ASDC J Dent Child. 1988 Mar-Apr;55(2):102-4.
The aim of this retrospective study was to compare the quad-helix and removable plate with respect to effect and cost of treatment in the mixed dentition with unilateral forced crossbite. In the quad-helix group (25 children), expansion was accomplished with a prefabricated .036'' quad-helix soldered to bands on the maxillary molars. In the plate group (25 children), the removable plates had a midline screw and four Adams clasps. The screw was opened by one quarter-turn each week. The crossbite was eliminated in all cases in the two groups. The respective results in the quad-helix group and in the plate group (in brackets) were: intermolar arch width increased 3.6 mm (3.7 mm); the total period of appliance therapy averaged 3.8 months (21.6 months), ranging from 2 to 6 months (12-30 months); the number of visits averaged 4.6 (16.0), ranging from 3 to 6 (11-22); number of appliances needed averaged 1 (1.7), and the costs of the appliances averaged $58 ($174). In the plate group, the average values of the laboratory costs were 3-fold, the number of visits 3.5-fold, and the expansion and retention time 5.7-fold more than the quad-helix group. The present treatment rationale with the quad-helix appliance is easy, effective, cost-efficient, and can be learned by every pedodontitis for correction of unilateral crossbites in the mixed dentition.
这项回顾性研究的目的是比较四螺旋矫治器和活动矫治板在治疗单侧功能性反合混合牙列时的治疗效果和成本。在四螺旋矫治器组（25名儿童）中，使用焊接在上颌磨牙带环上的预制0.036英寸四螺旋矫治器进行扩弓。在矫治板组（25名儿童）中，活动矫治板有一个中线螺丝和四个亚当斯卡环。每周将螺丝拧开四分之一圈。两组所有病例的反合均得以消除。四螺旋矫治器组和矫治板组（括号内）各自的结果如下：磨牙间牙弓宽度增加3.6毫米（3.7毫米）；矫治器治疗总时长平均为3.8个月（21.6个月），范围为2至6个月（12 - 30个月）；就诊次数平均为4.6次（16.0次），范围为3至6次（11 - 22次）；所需矫治器数量平均为1个（1.7个），矫治器成本平均为58美元（174美元）。在矫治板组中，实验室成本平均值是四螺旋矫治器组的3倍，就诊次数是3.5倍，扩弓和保持时间是5.7倍。采用四螺旋矫治器的当前治疗原理简单、有效、经济高效，并且每个儿童牙病医生都可以学会用于矫治混合牙列中的单侧反合。
