The corrosion resistance of rotary nickel titanium root canal files

doi:10.3969/j.issn.2095-4344.0765

Abstract

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.

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

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

CLC Number:

R318

Hu Xin, Wu Hui, Wang Lei, Zhang Qian, Ning Jia, Wu Wen-meng. The corrosion resistance of rotary nickel titanium root canal files[J]. Chinese Journal of Tissue Engineering Research, 2018, 22(18): 2866-2871.

Figures/Tables 4

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