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目的研究在同一牙弓中牙齿相互作用条件下,0.56mm×0.71mm(0.022英寸×0.028英寸)国产奥杰全程式托槽与日本OPA-K金属托槽在转矩控制方面是否有差异。方法通过Typodont水浴实验,模拟临床矫治过程,测量结束弓丝为0.48mm×0.64mm(0.019英寸×0.025英寸)SS方丝时使用两种品牌托槽的上颌55的唇舌向倾斜度,并通过数学编程计算转化为上颌55的转矩余隙角ψ,对其绝对值进行配对t检验。结果结束弓丝为0.48mm×0.64mm(0.019英寸×0.025英寸)SS方丝时,OPA-K金属托槽的转矩余隙角ψ的绝对值为(4.834±2.846)°,奥杰全程式金属托槽的转矩余隙角ψ的绝对值为(4.469±3.213)°,两种托槽间的差异无统计学意义(P=0.309)。结论0.56mm×0.71mm(0.022英寸×0.028英寸)的OPA-K金属托槽和奥杰全程式托槽在转矩控制方面无差异,临床上使用这两种托槽均可达到满意的转矩控制。

Comparison of two kinds of brackets on torque control

Objective To compare the effect of two kinds of brackets (OPA-K and ORJ metal brackets)on torque con-trol when teeth are interacted in the same arch. Methods After the upper arch was aligned and leveled in Typodont study, the inclinations of upper teeth 5⊥5 were measured when 0.56 mm × 0.71 mm OPA-K metal brackets and 0.56 mm × 0.71 mm ORJ brackets were filled with 0.48 mm × 0.64 mm SS. The inclinatons of each tooth were transformed to the absolute values of the torque play angle ψ by computing program, and paired-t test was used. Results The two kinds of brackets had no statistical significance on torque control when the brackets were filled with 0.48 mm × 0.64 mm SS;the absolute values of the angle ψ in 0.56 mm × 0.71 mm OPA-K metal brackets and 0.56 mm × 0.71 mm ORJ metal brackets were 4.834°±2.846° and 4.469°±3.213° respectively. There was no statistical significance between the two kinds of brackets. Conclusion There is no difference between 0.56 mm × 0.71 mm OPA-K metal bracket and 0.56 mm × 0.71 mm ORJ metal bracket on torque control; both of the two kinds of metal brackets can provide satisfying torque control.