Comparative Evaluation of Cyclic Fatigue and Corrosion Resistance of Three Different Nickel-Titanium Instruments

Objective: The aims of the study are to investigate the effect of the surface treatment process on prolonging the life of the rotary instruments against cyclic fatigue and the effect of the surface coating process on the corrosion resistance of Ni-Ti files.Methods: This study was carried out in two stages. In the first one, a total of 120 Ni-Ti rotary instruments (25/.04 taper) from 3 brands (HeroShaper, RaCe, and TF) were selected. Sixty of them were anodized then all of them were tested in simulated root canals with two different curvatures. The time until fracture was recorded, and the number of cycles was calculated for each group. The second stage; the effect of anodization on corrosion resistance was assessed. The file groups tested in 5% NaOCl solution at 37° C. Data were subjected to The Mann-Whitney U test. The significance level was set at P= 0.05.Results: There was a statistical difference among the rotary systems in terms of cyclic fatigue. Among the file types, TF instruments were the most resistance to cyclic fatigue and RaCe instruments had the lowest results. The effect of anodization process was different among file groups.Conclusion: Within the limits of this study, the increase in canal curvature reduces the life of the rotary instruments. While the anodization process did not change cyclic fatigue in all file groups in 20° curved canals, it reduced the wear life of RaCe and HeroShaper files and extended the wear life of TF files in canals with 37° curved canals.

Anahtar Kelimeler:

Anodization, Canal curvature, Corrosion, Cyclic fatigue, HeroShaper, RaCe, Ni-Ti, Rotary system files, Twisted File.

Comparative Evaluation of Cyclic Fatigue and Corrosion Resistance of Three Different Nickel-Titanium Instruments

Keywords:

Anodozation, canal curvature, cyclic fatigue, HeroShaper, RaCe, Ni-Ti, rotary systems files, twisted file,

PDF

___

1. Kikly A, Jaafoura S, Kammoun D, Sahtout S. Sealing Ability of Endodontic Cements: An In Vitro Study. Int J Dent. 2020;5862598:1-7
2. Dederich DN, Zakariasen KL. The effects of cyclical axial motion on rotary endodontic instrument fatigue. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 1986; 61(2), 192-196.
3. Brantley WA, Luebke NH, Luebke FL, Mitchell JC. Performance of engine-driven rotary endodontic instruments with a superimposed bending deflection: V. Gates Glidden and Peeso drills. J Endod. 1994; 20(5), 241-245.
4. Luebke NH, Brantley WA, Sabri ZI, Luebke FL, Lausten LL. Physical dimensions, torsional performance, bending properties, and metallurgical characteristics of rotary endodontic instruments: VI. Canal master drills. J Endod. 1995; 21(5), 259-263.
5. Sismanoglu T. Improvement of Surface Properties Of 2024, 6082 And 7075 Aluminum Alloys by Anodic Oxidation Thesis (M.Sc.). Istanbul Technical University, Institute of Science and Technology, 2009.
6. Barrs J, Miller D, Howard J, Gilbert J, Lautenschlager E. The evaluation of corrosion in stainless steel endodontic files. Northwest Dent Res. 1996;7(1), 27-31.
7. Stokes OW, Di Fiore PM, Barss JT, Koerber A, Gilbert JL, Lautenschlager EP. Corrosion in stainless-steel and nickel-titanium files. J Endod. 1999; 25(1), 17-20.
8. Materials & Devices New American Dental Association Specification No. 28 for endodontic files and reamers. J Am Dent Assoc. 1976; 93(4), 813-817.
9. Serene T, Adams J, Saxena A. Nickel-Titanium Instruments: Applications in endodontics. St. Louis Missouri, USA: Ishiyaku Euroamerica. Inc. 1995; 112p.
10. Larsen CM, Watanabe I, Glickman GN, He J. Cyclic fatigue analysis of a new generation of nickel titanium rotary instruments. J Endod. 2009;35(3),401-403.
11. Plotino G, Grande NM, Cordaro M, Testarelli L, Gambarini G. A review of cyclic fatigue testing of nickel-titanium rotary instruments. J Endod. 2009;35(11), 1469-1476.
12. Lee M-H, Versluis A, Kim B-M, Lee C-J, Hur B, Kim H-C. Correlation between experimental cyclic fatigue resistance and numerical stress analysis for nickel-titanium rotary files. J Endod. 2011;37(8),1152-1157.
13. De‐Deus G, Moreira E, Lopes H, Elias C. Extended cyclic fatigue life of F2 ProTaper instruments used in reciprocating movement. Int Endod J. 2010;43(12),1063-1068.
14. Plotino G, Grande N, Melo M, Bahia M, Testarelli L, Gambarini G. Cyclic fatigue of NiTi rotary instruments in a simulated apical abrupt curvature. Int Endod J. 2010;43(3),226-230.
15. Grande N, Plotino G, Pecci R, Bedini R, Malagnino V, Somma F. Cyclic fatigue resistance and three‐dimensional analysis of instruments from two nickel–titanium rotary systems. Int Endod J. 2006;39(10), 755-763.
16. Kramkowski TR, Bahcall J. An in vitro comparison of torsional stress and cyclic fatigue resistance of ProFile GT and ProFile GT Series X rotary nickel-titanium files. J Endod. 2009;35(3), 404-407.
17. Tripi TR, Bonaccorso A, Condorelli GG. Cyclic fatigue of different nickel-titanium endodontic rotary instruments. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2006;102:e106-14.
18. Kim H-C, Yum J, Hur B, Cheung GS-P. Cyclic fatigue and fracture characteristics of ground and twisted nickel-titanium rotary files. J Endod. 2010;36(1),147-152.
19. Oh S-R, Chang S-W, Lee Y, Gu Y, Son W-J, Lee W, et al. A comparison of nickel-titanium rotary instruments manufactured using different methods and cross-sectional areas: ability to resist cyclic fatigue. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2010;109(4),622-628