Class I and Class II Patients Treated with Damon System: A Study of Transversal, Sagittal and Torque Values Variations

Francesca Cremonini, Daniela Guiducci, Emanuela Pierotti
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Abstract

Objective: To analyze the transversal and anterior-posterior changes obtained in patients treated only with the Damon system. Material and Methods: 51 patients with either class I or class II division 1 sagittal relationship treated with the Damon system and the same archwire sequence were retrospectively selected. Dental casts of each patient before (T0) and after treatment (T1) were scanned and analyzed using NEMOCAST 3D software. Inter-molar, inter first-premolar, inter-second premolar and inter-canine distances were measured in both upper and lower arches. Initial and final lateral cephalograms were traced using the OrisCeph program. Pre and post-treatment measurements were compared using the t-test for repeated measurements. The Pearson Correlation Index and Linear Regression Analysis were used to determine the dependence between continuous variables. The significance level was set at 0.05. Results: Transversal diameters in the upper arch increase statistically significantly, especially in the bicuspid area. Initial intra-arch diameter was the only statistically significant variable correlated with the final expansion obtained. A linear negative correlation between the initial latero-posterior torque and the final expansion was observed in both arches. Conclusion: Using identical arches in patients with very different initial characteristics, the changes in bicuspids’ diameters remain the most predominant. Patients with initial more negative torque in the posterior region had a higher expansion amount.
用Damon系统治疗的I类和II类患者:横向、矢状面和扭矩值变化的研究
目的:分析只接受Damon系统治疗的患者的横向和前后改变。材料和方法:回顾性选择51例采用Damon系统和相同弓丝序列治疗的ⅰ类或ⅱ类1段矢状位关系患者。采用NEMOCAST 3D软件对每位患者治疗前(T0)和治疗后(T1)的牙模进行扫描分析。测量上下牙弓的磨牙间、第一前磨牙间、第二前磨牙间和犬齿间的距离。使用OrisCeph程序追踪初始和最终侧位脑电图。使用t检验比较治疗前后的测量结果。采用Pearson相关指数和线性回归分析确定连续变量之间的相关性。显著性水平设为0.05。结果:上弓横向直径明显增加,尤其是在双尖牙区。初始弓内直径是唯一与最终扩张相关的有统计学意义的变量。在两个弓中观察到初始前后扭矩与最终扩张之间呈线性负相关。结论:对于初始特征差异很大的患者,使用相同的弓时,两尖瓣直径的变化最为明显。后侧负扭矩越大的患者扩张量越大。
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