带状弓丝与传统正畸弓丝机械力学性能对比研究

Comparative Study of Mechanical Properties of the Ribbon Arch and the Rectangular Wires

目的比较带状弓丝与传统正畸弓丝的机械力学性能。方法选取临床常用的Plasdent,3M和Ormco三个品牌正畸不锈钢方丝,按0.016×0.022英寸、0.017×0.025英寸、0.018×0.025英寸、0.019×0.025英寸分为带状弓与传统弓丝,并与直径0.016,0.018,0.020英寸不锈钢圆丝和澳丝进行比较。每组10根弓丝。通过材料试验机进行三点弯曲实验,测试在2支点间距14 mm、加载速度1 mm/s、室温25℃测试条件下弓丝负荷与形变关系,计算抗弯刚度。用Origin 8.0软件绘制负荷形变曲线图。采用SPSS10.0统计软件对实验结果进行统计学分析。结果(1)各品牌带状弓丝抗弯刚度均显著大于相同尺寸传统方丝(P<0.05)。(2)3个品牌的0.017×0.025英寸带状弓丝刚度均大于各自系列0.019×0.025英寸传统弓丝,其中Plasdent和Ormco组的差异有统计学意义((P<0.05)。结论使用带状弓有助于维持[牙合]平面的稳定;可选用0.017×0.025英寸带状弓丝作为带状弓矫正器主弓丝。

Objective To compare the mechanical properties of the ribbon arch with the rectangular wires.Methods Using 3point bending tests to investigate the loaddeflection characteristics of 8 groups orthodontic wires which belonged to 3 brands,each brand inclued 0.016×0.022 inch,0.017×0.025 inch,0.018×0.025 inch,and 0.019×0.025 inch rectangular wires.Result(1)The bending strength of the ribbon arch was significantly larger than the orthodontic rectangular wires in all brand.(2)No matter which brand,the bending strength of 0.017×0.025 inch ribbon arch was larger than 0.019×0.025 inch rectangular wires.There was a statistically significant difference between the Plasdent and Ormco groups(P<0.05).Conclusion(1)The stiffness of ribbon arch was bigger than rectangular wires,which helpsmaintain the stability of the occlusal plane.(2)We can use 0.017×0.025 inch ribbon bow wire as the main bow wire of the orthotic.