Lie Ferdinand, Kuitert Reinder, Zentner Andrej
Department of Orthodontics, Academic Centre for Dentistry, Amsterdam, The Netherlands.
Eur J Orthod. 2006 Jun;28(3):262-8. doi: 10.1093/ejo/cji111. Epub 2006 Feb 22.
The aim of this study was to investigate the post-treatment development of the curve of Spee (CS) and to predict its post-treatment stability on the basis of cephalometric parameters. Lateral cephalograms and study models of 135 subjects (50 males and 85 females) were taken before orthodontic treatment (T1; 12.0 +/- 1.5 years), at the end of orthodontic treatment (T2; 14.6 +/- 1.5 years), and at least 3 years out of retention (T3; 26.6 +/- 5.0 years); the curve depth (CD), location of the deepest point (LDP) of the curve, and eight cephalometric parameters were assessed. The sample was divided into a treated and an untreated lower arch group. The upper arch was treated in all patients. The sample consisted of 25 per cent Class I, 73 per cent Class II, and 2 per cent Class-III-treated malocclusions. The results showed that the post-treatment CD was frequently unstable and unexpected changes were relatively common. The LDP was displaced distally during T1-T2 and showed mesial relocation during T2-T3. Assessment of potential predictors of the post-treatment changes in CD and LDP using stepwise regression analysis showed that a deep curve at T2 was associated with a decrease of the CD during T2-T3. A combination of distal location of the LDP with proclination of the lower incisors at T2 and extraction treatment was associated with mesial relocation of the LDP during T2-T3. The results also suggest that an optimal CD of about 2.0 mm at T2 was associated with the least amount of post-treatment change.
本研究的目的是调查正畸治疗后斯皮曲线（CS）的变化情况，并根据头影测量参数预测其治疗后的稳定性。对135名受试者（50名男性和85名女性）在正畸治疗前（T1；12.0±1.5岁）、正畸治疗结束时（T2；14.6±1.5岁）以及保持至少3年后（T3；26.6±5.0岁）拍摄头颅侧位片和制取研究模型；评估曲线深度（CD）、曲线最深点的位置（LDP）以及八个头影测量参数。样本分为治疗组和未治疗组下牙弓。所有患者的上牙弓均接受了治疗。样本包括25%的安氏I类、73%的安氏II类和2%的安氏III类错牙合畸形。结果显示，治疗后的CD常常不稳定，意外变化较为常见。LDP在T1-T2期间向远中移位，在T2-T3期间向近中复位。使用逐步回归分析评估CD和LDP治疗后变化的潜在预测因素，结果显示T2时曲线较深与T2-T3期间CD减小有关。T2时LDP的远中位置、下切牙前倾以及拔牙治疗的组合与T2-T3期间LDP的近中复位有关。结果还表明，T2时约2.0mm的最佳CD与治疗后变化量最小有关。
