中国组织工程研究 ›› 2018, Vol. 22 ›› Issue (18): 2866-2871.doi: 10.3969/j.issn.2095-4344.0765

• 组织工程口腔材料 tissue-engineered oral materials • 上一篇    下一篇

机用镍钛根管锉的抗腐蚀能力

胡 欣1,吴 卉2,王 磊3,张 倩1,宁 佳1,吴文孟1   

  1. 1天津医科大学口腔医院综合科,天津市 300070;2天津市南开医院口腔科,天津市 300100;3北京通州区新华医院口腔科,北京市 101100
  • 收稿日期:2017-12-09 出版日期:2018-06-28 发布日期:2018-06-28
  • 作者简介:胡欣,男,1971年生,天津市人,汉族,2011年天津医科大学毕业,博士,副主任医师,主要从事生物材料领域相关研究。
  • 基金资助:

    天津医科大学口腔医院科研基金(2013yky02)

The corrosion resistance of rotary nickel titanium root canal files

Hu Xin1, Wu Hui2, Wang Lei3, Zhang Qian1, Ning Jia1, Wu Wen-meng1   

  1. 1Department of General Dentistry, Stomatological Hospital of Tianjin Medical University, Tianjin 300070, China; 2Department of Stomatology, Tianjin Nankai Hospital, Tianjin 300100, China; 3Department of Stomatology, Tongzhou Xinhua Hospital, Beijing 101100, China
  • Received:2017-12-09 Online:2018-06-28 Published:2018-06-28
  • About author:Hu Xin, M.D., Associate chief physician, Department of General Dentistry, Stomatological Hospital of Tianjin Medical University, Tianjin 300070, China
  • Supported by:

    the Scientific Research Foundation of the Stomatological Hospital of Tianjin Medical University, No. 2013yky02

摘要:

文章快速阅读:

 

文题释义:
镍钛根管锉:镍钛器械作为一种“形态记忆合金”,具有超弹性和柔韧性,在成型弯曲根管的过程中,可显著降低根管偏移的发生率及器械的折断率,20世纪90年代以来,镍钛器械逐渐走进人们的视野,在发达国家中的应用已相当普遍。
极化曲线:研究可逆电池的电动势和电池反应时,当有电流明显地通过电池时,电极的平衡状态被破坏,电极电势偏离平衡值,电极反应处于不可逆状态,而且随着电极上电流密度的增加,电极反应的不可逆程度也随之增大;由于电流通过电极而导致电极电势偏离平衡值的现象称为电极的极化,描述电流密度与电极电势之间关系的曲线称作极化曲线。
 
 
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。

ORCID: 0000-0002-8533-4311(胡欣) 

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

Abstract:

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 characteristics. The passivation zone was unapparent in group A, became obvious in group E. There were similar polarization curves in the groups C and D. Group B showed relatively positive corrosion potential. In summary, both 5.25% sodium hypochlorite solution and autoclave sterilization have no influence on the anti-fatigue breaking ability of M3 nickel titanium files, but the combined use can enhance the corrosion resistance ability of M3 nickel titanium files. 

Key words: Root Canal Therapy, Corrosion, Sodium Hypochlorite, Tissue Engineering

中图分类号: