Lione Roberta, Ballanti Fabiana, Franchi Lorenzo, Baccetti Tiziano, Cozza Paola
Department of Orthodontics, University of Florence, Florence, Italy.
Am J Orthod Dentofacial Orthop. 2008 Sep;134(3):389-92. doi: 10.1016/j.ajodo.2008.05.011.
The aim of this study was to apply low-dose computed tomography (CT) to evaluate treatment and posttreatment effects produced by rapid maxillary expansion (RME) at the levels of the midpalatal suture and the pterygoid processes.
A sample of 17 subjects (7 boys, 10 girls; mean age, 11.2 years) was analyzed. Multi-slice CT scans were taken before RME, at the end of the active expansion phase, and after a retention period of 6 months. Statistical analysis was performed with ANOVA for repeated measures with post-hoc tests.
The amounts of opening of the midpalatal suture during the active phase of expansion were 3.01, 2.17, and 1.15 mm for the anterior, middle, and posterior suture widths, respectively. Pterygoid width also showed a statistically significant increase (1.49 mm). In the postretention period, all transverse measurements had significant decreases except for pterygoid width.
At the end of the retention phase after RME therapy, the transverse width of the midpalatal suture was similar to the pretreatment width, whereas the width between the pterygoid processes was significantly increased.
本研究的目的是应用低剂量计算机断层扫描（CT）来评估快速上颌扩弓（RME）在腭中缝和翼突水平产生的治疗效果及治疗后效果。
分析了17名受试者（7名男孩，10名女孩；平均年龄11.2岁）的样本。在RME治疗前、主动扩弓阶段结束时以及6个月的保持期后进行多层CT扫描。采用重复测量方差分析及事后检验进行统计分析。
在扩弓活跃期，腭中缝前部、中部和后部的开口量分别为3.01、2.17和1.15mm。翼突宽度也有统计学意义的增加（1.49mm）。在保持期后，除翼突宽度外，所有横向测量值均有显著下降。
RME治疗后的保持阶段结束时，腭中缝的横向宽度与治疗前宽度相似，而翼突之间的宽度显著增加。
