Assessment of the Nickel Ion Releases from the Broken Stainless Steel and Nickel Titanium Endodontic Instruments

UZUN, İsmail; GÜLER, Buğra; ÖZYÜREK, Taha; UÇARLI, Okan; BODRUMLU, Emre; MENEK, Necati
October 2014
International Journal of Electrochemical Science;2014, Vol. 9 Issue 10, p5812
Academic Journal
Purpose: The purpose of this study was to assess the nickel ion releases from the broken stainless steel and nickel titanium endodontic instruments in a phosphate buffer solution at different time periods. Methods: Thirty-two extracted human mandibular premolars with mature apices, single canals and of similar lengths were selected for the study. #35.04 Mtwo and #35.02 K-files were used for this study. Thirty-two extracted human mandibular premolars were divided into two groups randomly (n: 16) according to material type of file (stainless steel or NiTi). These two groups were then divided into two subgroups: files located at the apical foramen level (n:8) or 3 mm beyond the apical foramen (n:8). The voltammetric experiments were carried out using a computer controlled electroanalysis system the Metrohm 757 VA Computrace Electrochemical Analyzer. Comparisons intragroup and intergroups were evaluated with Kruskal-Wallis H and Mann-Whitney U tests statistically. Results: No ion release was detected in both file groups at the apical foramen level (p>0.05). In 3 mm beyond from apical foramen group, stainless steel showed no ion release; nevertheless, NiTi files presented ion release (p<0.05). Evaluation of nickel ion release of NiTi files showed statistical difference regarding time intervals (p<0.05). Conclusion: It is concluded that removal of separated file in patients with history of nickel allergy, is important when separated file tip is 3 mm beyond the apical foramen because of possibility of nickel ion release.


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