Akkaya S, Lorenzon S, Uçem T T
Department of Orthodontics, Gazi University, Ankara, Turkey.
Eur J Orthod. 1999 Apr;21(2):175-80. doi: 10.1093/ejo/21.2.175.
The purpose of this study was to determine the vertical and sagittal effects of bonded rapid maxillary expansion (RME), and bonded slow maxillary expansion (SME) procedures, and to compare these effects between the groups. Subjects with maxillary bilateral crossbites were selected and two treatment groups with 12 patients in each were constructed. The Hyrax screw in the RME treatment group and the spring of the Minne-Expander in the SME treatment group were embedded in the posterior bite planes, which had a thickness of 1 mm. At the end of active treatment these appliances were worn for retention for an additional 3 months. Lateral cephalometric radiographs were taken at the beginning and end of treatment, and at the end of the retention period. The maxilla showed anterior displacement in both groups. The mandible significantly rotated downward and backward only in the RME group. The inter-incisal angle and overjet increased in both groups. No significant differences were observed for the net changes between the two groups.
本研究的目的是确定粘结式快速上颌扩弓（RME）和粘结式慢速上颌扩弓（SME）程序的垂直和矢状面效应，并比较两组之间的这些效应。选择患有上颌双侧反牙合的受试者，构建两个治疗组，每组12例患者。RME治疗组的Hyrax扩弓螺旋器和SME治疗组的Minne-扩弓器的弹簧嵌入厚度为1mm的后牙咬合平面中。在积极治疗结束时，这些矫治器再佩戴3个月用于保持。在治疗开始和结束时以及保持期结束时拍摄头颅侧位X线片。两组上颌均出现前移位。仅RME组下颌明显向下和向后旋转。两组的切牙间角和覆盖均增加。两组之间的净变化未观察到显著差异。
