GATA Military Research and Training Hospital, Dental Clinic, Section of Orthodontics, Istanbul, Turkey.
Angle Orthod. 2010 Jan;80(1):5-9. doi: 10.2319/011209-22.1.
To evaluate the long-term changes in maxillary arch widths, overjet, and overbite in patients who were treated with rapid maxillary expansion (RME) followed by edgewise appliances.
The material for the study consisted of study casts taken from 41 patients (19 males, 22 females) on four different occasions (before treatment, T1; after RME, T2; after treatment, T3; and during follow-up period, T4). The upper intercanine, interpremolar, and intermolar widths and overjet and overbite were measured on each set of study casts. Mean age of the subjects was 13.2 +/- 1.3 years (range, 11.2-16.9 years) at T1, 13.3 +/- 1.3 years (range, 11.3-17 years) at T2, 15.5 +/- 1.4 years (range, 13.1-18.8 years) at T3, and 20.4 +/- 1.6 years (range, 17.9-24.8 years) at T4.
The net increase in intercanine width, interpremolar width, intermolar width, overjet, and overbite was 1.4 +/- 2.4 mm, 4.6 +/- 2.6 mm, 4.3 +/- 2.5 mm, 0.1 +/- 0.6 mm, and 0.2 +/- 0.6 mm, respectively, and the relapse rates were 37% for intercanine width, 19% for interpremolar width, and 17% for intermolar width at the end of the follow-up period.
A significant amount of relapse occurred in maxillary arch widths at the postretention assessment, the greatest being in intercanine width. RME significantly decreased overbite and increased overjet, and a statistically significant decrease was observed in both overbite and overjet at the postretention assessment.
评估上颌扩弓（RME）后再用方丝弓矫治器治疗的患者上颌弓宽度、覆颌和覆盖的长期变化。
研究材料由 41 名患者（19 名男性，22 名女性）的研究模型组成，分别在四个不同时期（治疗前 T1；RME 后 T2；治疗后 T3；和随访期间 T4）采集。在上颌每副模型上测量尖牙间宽度、前磨牙间宽度、磨牙间宽度、覆颌和覆盖。患者的平均年龄为 T1 时 13.2 +/- 1.3 岁（范围 11.2-16.9 岁），T2 时 13.3 +/- 1.3 岁（范围 11.3-17 岁），T3 时 15.5 +/- 1.4 岁（范围 13.1-18.8 岁），T4 时 20.4 +/- 1.6 岁（范围 17.9-24.8 岁）。
尖牙间宽度、前磨牙间宽度、磨牙间宽度、覆颌和覆盖的净增加量分别为 1.4 +/- 2.4mm、4.6 +/- 2.6mm、4.3 +/- 2.5mm、0.1 +/- 0.6mm 和 0.2 +/- 0.6mm，在随访期末，尖牙间宽度的复发率为 37%，前磨牙间宽度的复发率为 19%，磨牙间宽度的复发率为 17%。
在上颌弓宽度的保持评估期末，发生了大量的复发，以尖牙间宽度最为明显。RME 显著减小了覆盖，增加了覆颌，并且在保持评估期末，覆盖和覆颌都有统计学意义的减小。
