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目的:比较正畸治疗中三种关闭间隙方法:弹性向后结扎、(聚胺基甲酸酯)链状弹力圈和镍钛螺旋拉簧的临床效果。研究样本:进入固定矫治器关闭阶段的患者。这些患者开始正畸治疗时的年龄为10~18岁,牙列每一象限均各拔除一颗双尖牙;使用Roth直丝弓矫治器并已用0.019×0.025英寸方丝平齐至少四周。作者根据研究要求计算出实验所需样本量为33人。研究方法:33名患者被随机分至三组:弹性向后结扎组12人(48象限);链状弹力圈组10人(40象限);镍钛螺旋拉簧组11人(44象限)。实验过程采用盲法(患者和临床主治大夫加力前不知所用方法;研究人员整个实验过程不知所用方法)。在开始关闭间隙时和四个月后分
OBJECTIVE: To compare three methods of closing the gap in orthodontic treatment: the clinical effect of elastic ligature, (polyurethane) chain elastic ring and nickel-titanium coil tension spring. Study Sample: Patients who entered the closed appliance phase. The patients were 10 to 18 years old when orthodontic treatment was started and one canine was removed for each quadrant of the dentition; a Roth straightener was used and had been flattened for at least four weeks with 0.019 x 0.025 inch square wire. The authors calculated the required sample size for the experiment based on the research requirements of 33 people. METHODS: Thirty-three patients were randomly assigned to one of three groups: 12 in the elastic rear ligation group (48 quadrants), 10 in the chain elastic ring group (40 quadrants) and 11 in the nickel-titanium coil tension group (44 quadrants). The experimental process using the blind method (patients and clinical advocates do not know the method used by the doctor before the force; researchers do not know the method used throughout the experimental process). At the beginning of closing the gap and after four months