Freeman David C, McNamara James A, Baccetti Tiziano, Franchi Lorenzo, Fränkel Christine
University of Michigan, Ann Arbor, MI, USA.
Am J Orthod Dentofacial Orthop. 2009 May;135(5):570.e1-6; discussion 570-1. doi: 10.1016/j.ajodo.2007.11.029.
The objective of this study was to evaluate the long-term effectiveness in a group treated with the FR-2 appliance of Fränkel compared with an untreated Class II control group.
The sample consisted of 30 patients (17 boys, 13 girls) treated exclusively with the FR-2 by Rolf Fränkel. The mean age at the start of treatment was 8 years (T1), with a posttreatment cephalogram (T2) taken 10 years later. The control group included 20 subjects (11 boys, 9 girls) with untreated Class II malocclusion. Their mean ages at T1 and T2, and the mean times of observation, matched the treatment group closely. Lateral cephalograms were analyzed with a specific tracing regimen at both T1 and T2 in both groups. The Student t test was used to compare changes between the groups
The FR-2 group maintained stable correction of the initial Class II malocclusion over the evaluation period. Significant mandibular and intermaxillary changes and dentoalveolar changes were noted in the treated group, with a 3-mm long-term increase in mandibular length compared with the untreated Class II controls.
This study suggests that correction of a Class II malocclusion with the FR-2 appliance maintains favorable results over the long term with both skeletal and dentoalveolar changes.
本研究的目的是评估与未经治疗的安氏II类对照组相比，使用弗兰克尔FR-2矫治器治疗的一组患者的长期疗效。
样本包括30例仅接受罗尔夫·弗兰克尔的FR-2矫治器治疗的患者（17名男孩，13名女孩）。治疗开始时的平均年龄为8岁（T1），10年后拍摄治疗后头影测量片（T2）。对照组包括20名未经治疗的安氏II类错牙合患者（11名男孩，9名女孩）。他们在T1和T2时的平均年龄以及平均观察时间与治疗组密切匹配。两组在T1和T2时均采用特定的描记方案对头影测量片进行分析。采用学生t检验比较两组之间的变化。
在评估期内，FR-2组维持了对初始安氏II类错牙合的稳定矫治。在治疗组中观察到明显的下颌和颌间变化以及牙牙槽变化，与未经治疗的安氏II类对照组相比，下颌长度长期增加3毫米。
本研究表明，使用FR-2矫治器矫治安氏II类错牙合在长期内对骨骼和牙牙槽变化均能维持良好效果。
