目的:比较Beta-钛丝与正畸临床常用的超弹性镍钛丝及不锈钢丝的合金成分、表面形貌以及力学性能,为临床应用提供参考.方法:选取Beta-钛丝、超弹性镍钛丝及不锈钢丝,弓丝尺寸均为0.43 mm×0.64 mm.选用EDAX X-射线能谱分析仪联合SUPRATM 55热场发射扫描电子显微镜分析弓丝的合金成分,观察其表面形貌.使用Nano Indenter XP纳米压痕测试机测定弓丝弹性模量及硬度,使用Instron 5848微力材料试验机,三点弯曲测定弓丝的负荷-形变曲线.结果:Beta-钛丝合金成分中含有Ti、Zr、Mo、Sn 4种元素,不锈钢丝含有Fe、Mn、Cr、Si,超弹性镍钛丝含有Ni、Ti 2种元素.不锈钢丝表面比Beta-钛丝及镍钛丝光滑.Beta-钛丝的弹性模量及硬度明显小于不锈钢丝,略大于超弹性镍钛丝.当形变3 mm的负荷完全去除时,Beta-钛丝及不锈钢丝均有残余形变,超弹性镍钛丝形变完全恢复.结论:Beta-钛丝、超弹性镍钛丝及不锈钢丝依据其性能适用于正畸治疗的不同阶段.%Objective:To compare the differences of Beta-titanium alloy wires, superelastic nitinol wires and stainless steel wires (SSW) in elemental components, surface characteristics and mechanical properties for clinical orthodontic use. Methods; Beta-titanium alloy wires, superelastic nitinol wires and SSW were used. All the wires were in the same size of 0.43 mm×0.64 mm. ED AX and SUPRATM 55 SEM were used to analyze the components and surface characteristics. Nano Indenter XP was used to test elasticity modulus and hardness of the wires. Three-Bending Test was performed to compare the mechanical properties in Instron 5848 equipment. Results: Ti, Zr, Mo, Sn were contained in Beta- titanium wire, Ni and Ti in superelstic nitinol wire, Fe, Mn, Cr and Si in SSW. The surface of SSW was the smoothest. The value of elasticity modulus and hardness in Beta-titanium was much lower than in SSW and a little higher than in superelastic nitinol. There were residual deformations existed in SSW and Beta-titanium wires when unloaded to zero, while none in superelastic nitinol wire. Conclusion; According to their properties, Beta-titanium, superelastic nitinol and SSW are applicable to different clinical situations.
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