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目的探讨在0.022×0.028“直丝弓托槽上先后使用0.0l9×0.025”和0.02l×0.025“的方形弓丝对于前牙的唇舌向倾斜度所产生的影响.方法在20例非拔牙矫治患者中选出10例前牙唇舌向倾斜度欠满意的患者,对其使用0.0l9×0.025”和0.02l×0.025“两种方丝时的头颅侧位片进行测量,对0.021×0.025”的方丝引起的前牙唇舌向倾斜度的变化进行统计分析.结果将0.0l9×0.025“不锈钢方丝更换为0.02l×0.025”方钛丝2个月后,其引起的代表前牙唇舌向倾斜度的测量指标的变化有统计学意义(P<0.01).结论在使用0.019×0.025“不锈钢方丝后,换用0.02l×0.025”的方钛丝并使其有一定的作用时间,可以引起前牙唇舌向倾斜度的明显变化.“,”Objective To investigate the inflrence on labiolingual inclination of anterior teeth by using 0.019×0.025 inch and 0.021×0.025 inch rectangular arch wires in 0.022-inch straight wire appliance system. Methods 10 patients whose labiolin.ual inclination of anteriorteeth were not satisfied were selected from 20 nonextraction patients. Lateral cephalograms of patients when using 0.019×0.025 inch and 0.021×0.025 inch rectangular arch wires were analyzed. Statistic analysis was conducted on the change of labiolingual inclination of anterior teeth caused by 0. 021×0.025 inch rectangular nickel-titanium arch wires. Results Statistical significance(p < 0.01) in the change of labiolingual inclination of anterior teeth betoeen using 0.021×0.025 inch rectangular nickel-titanium arch wires and 0. 019×0. 025 inch rectangular stainless steel arch wires was found. Conclusion Significant change of labiolingual inclination of anterior teeth could be seen when 0.021×0.025 inch rectangular nickel-titamun. arch wires were used for the two month period after 0.019×0.025 inch rectangular stainless steel arch wires.