机用镍钛根管锉的抗腐蚀能力  

The corrosion resistance of rotary nickel titanium root canal files

作　　者：胡欣[1] 吴卉 王磊 张倩[1] 宁佳[1] 吴文孟 Hu Xin;Wu Hui;Wang Lei;Zhang Qian;Ning Jia;Wu Wen-meng(Department of General Dentistry,Stomatological Hospital of Tianjin Medical University,Tianjin 300070,China;Department of Stomatology,Tianjin Nankai Hospital,Tianjin 300100,China;Department of Stomatology,Tongzhou Xinhua Hospital,Beijing 101100,China)

机构地区：[1]天津医科大学口腔医院综合科 [2]天津市南开医院口腔科 [3]北京通州区新华医院口腔科

出　　处：《中国组织工程研究》2018年第18期2866-2871,共6页Chinese Journal of Tissue Engineering Research

基　　金：天津医科大学口腔医院科研基金(2013yky02)~~

摘　　要：背景:镍钛根管锉是根管治疗的主要工具,其腐蚀性能是影响器械正常使用的重要因素。因此,研究镍钛根管锉的耐腐蚀性能具有重要临床意义。目的:评价M3镍钛根管锉(M2型)经次氯酸钠溶液浸泡和高压蒸汽灭菌后的耐腐蚀性能和抗疲劳折断能力。方法:将75支M3镍钛根管锉分5组,每组15支:A组,未经任何处理,作为空白对照;B组,5.25%次氯酸钠溶液浸泡工作刃10 min,重复5次;C组,高压蒸汽灭菌处理5次;D组,先使用5.25%次氯酸钠溶液浸泡工作刃10 min,再行高压蒸汽灭菌处理,此过程重复5遍;E组,先使用5.25%次氯酸钠溶液浸泡工作刃10 min,再行高压蒸汽灭菌处理10遍。检测各组处理后的抗疲劳折断能力和耐腐蚀性能(极化阻力值、电化学阻抗及与极化曲线)。结果与结论:(1)抗疲劳折断能力:各组折断前的旋转数无差异;(2)极化阻力值:E组极化阻力值最高,相比A组高出两个数量级;B组、D组极化阻力值与A组比较有所提高;C组与A组极化阻力值在同一数量级;(3)电化学阻抗:E组电化学阻抗最高,B组、D组电化学阻抗与A组比较有所提高,C组和A组电化学阻抗在同一数量级;(4)极化曲线:5组均呈现出一定的钝化特性,A组钝化最不明显,E组钝化区明显,C和D曲线相接近,B表现出比较正的腐蚀电位;(5)结果表明:高压蒸汽灭菌和5.25%次氯酸钠溶液不会影响M3镍钛根管锉的抗疲劳折断能力,但高压蒸汽灭菌联合5.25%次氯酸钠溶液能增强其耐腐蚀能力。BACKGROUND： A nickel titanium root canal file is the major instrument in root canal therapy, and its corrosion resistance is an important factor influencing its normal use. Therefore, it is of great clinicals ignificance to study the corrosion resistance of nickel titanium root canal files. OBJECTIVE： To assess the corrosion resistance and anti-fatigue breaking ability of M3 nickel titanium root canal files after rotating in NaOCl and autoclave sterilization. METHODS： Seventy-five M3 nickel titanium files were randomized into five groups （n=15 per group）： A group, without any treatment, as a blank control; B group, rotating in 5.25% NaOCl for 10 minutes, repeated five times; C group, autoclave sterilization, repeated five times; D group, rotating in 5.25% NaOCl for 10 minutes, followed by autoclave sterilization, repeated five times; E group, rotating in 5.25% NaOCl 10 minutes, followed by autoclave sterilization, repeated 10 times. The anti-fatigue breaking ability and corrosion resistance （polarization resistance, electrochemical impedance and polarization curve） of M3 nickel titanium files after rotating in 5.25% NaOCl or/and autoclave sterilization were observed. RESULTS AND CONCLUSION： （1） Anti-fatigue fracture ability： there was no difference among groups in rotation number before the breakage. （2） Polarization resistance value： group E had the highest polarization resistance value which showed two orders of magnitude higher than that of group A; compared with group A, groups B and D showed a little increase in the polarization resistance value; and the polarization resistance values in groups A and C were of the same order of magnitude. （3） Electrochemical impedance： group E had the highest electrochemical impedance; compared with group A, the electrochemical impedance of groups B and D was improved; and the electrochemical impedance of groups C and A was of the same order of magnitude. （4） The polarization curve： all groups showed certain passivation characteristi

关 键 词：口腔材料 镍钛锉 折断 腐蚀 次氯酸钠溶液 高压蒸汽灭菌 生物材料 

分 类 号：R318[医药卫生—生物医学工程]