九种镍钛矫正弓丝相变温度的对比研究  

Differential scanning calorimetry analyses of phase transformations in different nickel-titanium orthodontic wires

作　　者：白玉兴[1] 任超超[1] 王红梅[1] 郑玉峰[2] 王彦波[2] 厉松[1] 

机构地区：[1]首都医科大学口腔医学院正畸科,100050 [2]北京大学力学与工程科学系

出　　处：《中华口腔医学杂志》2008年第5期302-305,共4页Chinese Journal of Stomatology

基　　金：首都医学发展科研基金（2005-2018）

摘　　要：目的确定临床常用的9种镍钛矫正弓丝的马氏体相、奥氏体相、R相温度以及相变温度范围，为镍钛矫正弓丝的力学性能研究提供依据。方法采用差热扫描（differential scanning calorimetry，DSC）技术，确定9种临床常用镍钛矫正弓丝（A组：Smart SE圆丝；B组：Kleen PakR^TM圆丝；C组：中国镍钛牙弓丝圆丝；D组：Nitinol heat—activated圆丝；E组：Smart SE方丝；F组：Damon CuNiTi方丝；G组：L＆H Titan方丝；H组：中国镍钛牙弓丝Ⅰ方丝；Ⅰ组：中国镍钛牙弓丝Ⅱ方丝；每组3根弓丝）的相变过程和相变温度。结果A、B、D组镍钛矫正弓丝的奥氏体相结束温度（austenite finish，Af）分别为22．4℃、21．9℃、22．5℃，低于25℃，在口腔温度下不能再发生相变，没有形状记忆性能；C、H组镍钛矫正弓丝在DSC仪扫描范围内未发现相变状态。E、G、I组镍钛矫正弓丝在室温下为马氏体相和奥氏体相的混合体，Af分别为34．3℃、36．6℃、38．5℃，与口腔温度接近，具有形状记忆性能。F组镍钛矫正弓丝Af为61．5℃，远高于口腔温度，在口腔环境中也为马氏体相和奥氏体相的混合体，在口腔温度较高的情况下才能完全转变为奥氏体相，具有形状记忆功能。结论临床常用的9种镍钛矫正弓丝的相变温度和相变过程各不相同，并非所有弓丝均具有形状记忆性能，所以应根据临床治疗目的选用不同的弓丝。Objective To characterize anstenite, martensite and R phase temperatures as well as transition temperature ranges of the commonly used nickel-titanium （NiTi） orthodontic arch wires selected from several manufacturers. Methods Differential scanning calorimetry （DSC） method was used to study the phase transformation temperatures and the phase transition processes of 9 commonly used NiTi alloys （ types： 0. 406 mm, 0. 406 mm ×0. 559 mm） . Results The austenite finish temperatures of A, B, D NiTi wires were 22.4 ℃, 21.9 ℃, 22.5 ℃, respectively. No phase transformation was detected during oral temperature. It indicated that these types of NiTi wires did not possess shape memory property. For C and H NiTi wires, no phase transformation was detected during the scanning temperature range, suggesting that these two types of wires did not possess shape memory either. The austenite finish temperatures of E, G and I NiTi wires were 34.3 ℃, 36. 6 ℃, 38.5℃, respectively, which were close to the oral temperature and presented as martensitic-anstenitic structures at room temperature, suggesting that the NiTi wires listed above had good shape memory effect. Although F NiTi wire also showed martensitic-austenitic structures at room temperature, its anstenite finish temperature （61.5 ℃） was much higher than oral temperature. Conclusions The transformation phase temperatures and transformation behavior were varied among different NiTi alloys, leading to variability in shape memory effect.

关 键 词：正畸金属丝 相变 镍钛合金 

分 类 号：R686[医药卫生—骨科学]