三种相变点正畸镍钛合金弓丝的力学性能比较  

Comparison of mechanical properties on different phase transformation points of nickel-titanium orthodontic wires

作　　者：林军[1] 董陈[1] 赵研[2] 王晓祥[2] 

机构地区：[1]浙江大学医学院附属第一医院口腔科,浙江杭州310003 [2]浙江大学材料系,浙江杭州310027

出　　处：《浙江大学学报（医学版）》2007年第5期503-508,共6页Journal of Zhejiang University(Medical Sciences)

摘　　要：目的:研究不同相变点(A f值)正畸镍钛合金弓丝的性能,探讨其性能与相变点之间的关系。方法:对3种不同相变点的正畸镍钛合金圆丝(0.016″),在相同口腔温度(37℃)和形变速度及不同形变量下,利用三点弯曲实验测量应力应变曲线得到正畸力,测量弓丝的相变点。结果:在形变量3.0 mm时,相变点最高的镍钛弓丝产生的正畸力最小,反之相变点最低的正畸力最大。在小量形变范围内弓丝产生的正畸力无明显差异(P>0.05),但是超过0.5 mm后就出现了明显的差异(P<0.05),结果同形变量为3.0 mm时。结论:相变点温度高的3M un it和浙江大学材化学院提供的镍钛合金弓丝产生的正畸力相对较小、较稳定,其性能较好。Objective： To compare the mechanical properties of different phase transformation of nickel-titanium orthodontic archwires. Methods： Nickel-titanium orthodontic archwires with same-sized （0. 016”） but different phase transformation were examined using a three-point bend test. Samples were tested at same conditions and oral temperature（37℃ ）,but in different utmost strain capacity, then the strain-stress chart was obtained, the phase transformation point （Af） was also examined. Results： The wires of the highest phase transformation point had the least orthodontic force; on the contrast the least phase transformation point had the highest orthodontic force at 3.0 mm utmost strain capacity. The orthodontic forces were not different at the little strain capacity （P〉0.05） ,but which was significantly different adove the 0. 5 mm （P〈0.05） ,which was same as 3.0 mm. Conclusion： The nickel-titanium orthodontic archwires with high level of phase transformation have low orthodontic forces and more stability.

关 键 词：合金 镍/治疗应用 正畸矫正器 正畸学 矫正 钛/治疗应用 低温保存 生物力学 

分 类 号：R783.5[医药卫生—口腔医学]