Saporito I, Butti A C, Salvato A, Biagi R
Department of Orthodontics, School of Dentistry, University of Milan, Italy.
Minerva Stomatol. 2011 Nov-Dec;60(11-12):555-65.
The aim of this study was to compare the effectiveness of space closure of two bracket systems, self-ligating and conventional ones, considering two systems with the same design and prescription. The experimental model of this study aims to identify in general if one type of system is more suitable for planning the extractive therapy, without considering the clinical aspect necessary for an adequate orthodontic approach.
A resin maxilla without the first premolars was used to test the self-ligating and conventional brackets system. Space closure was achieved on 0.016x0.022" in stainless steel wires with nickel-titanium coil springs 150 grams in strength and 10 mm in length. Two experiment settings have been prepared. The first setting was made bonding conventional bracket on the right side and self-ligating on the left; the last one was made bonding self-ligating bracket on the right side and conventional on the left. All measurements (runs) have been repeated seven times for both settings.
During the closing phase of extraction spaces both systems are equable since there are no significant statistical differences (P=0.70).
Our typodont model showed no significant difference in the efficiency of space closure between the self-ligating bracket and conventional bracket tied with stainless steel ligatures.
本研究的目的是比较两种托槽系统（自锁式和传统式）在空间关闭方面的有效性，这两种系统具有相同的设计和处方。本研究的实验模型旨在总体上确定一种类型的系统是否更适合计划拔牙治疗，而不考虑适当正畸方法所需的临床方面。
使用没有第一前磨牙的树脂上颌来测试自锁式和传统托槽系统。使用强度为150克、长度为10毫米的镍钛螺旋弹簧在0.016x0.022英寸的不锈钢丝上实现空间关闭。准备了两种实验设置。第一种设置是在右侧粘结传统托槽，在左侧粘结自锁托槽；最后一种设置是在右侧粘结自锁托槽，在左侧粘结传统托槽。两种设置的所有测量（运行）均重复七次。
在拔牙间隙关闭阶段，两种系统效果相当，因为没有显著的统计学差异（P=0.70）。
我们的模型牙模型显示，自锁托槽和用不锈钢结扎丝结扎的传统托槽在空间关闭效率上没有显著差异。
