Keywords
Nickel
Titanium
Dental instruments.
How to Cite
Abstract
Aim: The aim of present study was to evaluate if the cross-section and the number of use have influence in cyclic fatigue resistance of rotary files. Methods: K3 Endo (group K) and EndoSequence (group E) files, 25/.04, 25 mm, were subdivided into 3 subgroups (n=12) according to the number of uses, 1, 3 and 5 uses, totalizing 72 files. The files were submitted to dynamic assays device moved by an electric engine, using 300 rpm of speed that permitted the reproduction of pecking motion. The files run within a temperate steel ring’s groove, simulating an instrumentation of a curved root canal with 40-degrees and 5-mm of curvature radius. The fracture of file was detected by sensor of device and the time and the number of cycles was acquired. The data were analyzed statistically by two-way ANOVA (p<0.05). Results: There were no statistical significant differences in regard to the number of uses (p>0.05). K3 Endo files showed greater resistance to cyclic fatigue than EndoSequence instruments (p<0.01). Conclusion: It may be concluded that the cross-section of instruments presented significant influence in cyclic fatigue resistance and the number of uses up to 5 times had no influence in cyclic fatigue resistance in both NiTi rotation systems evaluated.
References
Schäfer E, Florek H. Efficiency of rotary nickel-titanium K3 instruments compared with stainless steel hand K-Flexofile. Part 1. Shaping ability in simulated curved canals. Int Endod J. 2003 Mar;36(3):199-207.
Schäfer E, Schulz-Bongert U, Tulus G. Comparison of hand stainless steel and nickel-titanium rotary instrumentation: a clinical study. J Endod. 2004 Jun;30(6):432-5.
Schirrmeister JF, Strohl C, Altenburger MJ, Wrbas KT, Hellwig E. Shaping ability and safety of five different rotary nickel-titanium instruments compared with stainless steel hand instrumentation in simulated curved root canals. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2006 Jun;101(6):807-13.
Thompson SA, Dummer PMH. Shaping ability of Quantec Series 2000 rotary nickel-titanium instruments in simulated root canals: Part 2. Int Endod J. 1998 Jul;31(4): 268-74.
Thompson SA, Dummer PMH. Shaping ability of Quantec Series 2000 rotary nickel-titanium instruments in simulated root canals: Part 1. Int Endod J. 1998 Jul;31(4):259-67.
Yared G. In vitro study of the torsional properties of new and used ProFile nickel-titanium rotary files. J Endod. 2004 Jun;30(6):410-2.
Serene TP, Adams JD, Saxena A. Nickel-titanium instruments: applications in Endodontics. St Lois: Ishiyaku Euroamerica; 1995. 112 p.
Spanaki-Voreadi AP, Kerezoudis NP, Zinelis S. Failure mechanism of ProTaper Ni-Ti rotary instruments during clinical use: fractographic analysis. Int Endod J. 2006 Mar;39(3):171-8.
Ray JJ, Kirkpatrick TC, Rutledge RE. Cyclic fatigue of endosequence and K3 rotary files in a dynamic model. J Endod. 2007 Dec;33(12):1469-72.
Tygeson YA, Steiman R, Ciavarro C. Comparison of distortion and separation utilizing ProFile and Pow-R nickel-titanium rotary files. J Endod. 2001 Dec;27(12):762-4.
Haïkel Y, Serfaty R, Bateman G, Senger B, Allemann C. Dynamic and cyclic fatigue of engine-driven rotary nickel-titanium endodontic instruments. J Endod. 1999 Jun;25(6):434-40.
Li UM, Lee BS, Shih CT, Lan WH, Lin CP. Cyclic fatigue of endodontic nickel-titanium rotary instruments: static and dynamic tests. J Endod. 2002 Jun;28(6):448-51.
Kawakami DA, Candeiro GT, Akisue E, Caldeira CL, Gavini G. Effect of different torques in cyclic fatigue resistance of K3 rotary instruments. Braz J Oral Sci. 2015 Jun;14(2):122-5.
Zelada G, Varela P, Martín B, Bahillo JG, Magán F, Ahn S. The effect of rotational speed and the curvature of root canals on the breakage of rotary endodontic instruments. J Endod. 2002 Jul;28(7):540-2.
Gavini G, Caldeira CL, Akisue E, Candeiro GT, Kawakami DA. Resistance to flexural fatigue of Reciproc R25 files under continuous rotation and reciprocating movement. J Endod. 2012 May;38(5):684-7.
Sattapan B, Nervo GJ, Palamara JEA, Messer HH. Defects in rotary nickel-titanium files after clinical use. J Endod. 2000 Mar;26(3):161-5.
Mounce R. The K3 rotary nickel-titanium file system. Dent Clin North Am. 2004 Jan;48(1):137-57.
Herold KS, Johnson BR, Wenckus CS. A scanning electron microscopy evaluation of microfractures, deformation and separation in EndoSequence and ProFile nickel-titanium rotary files using an extracted molar tooth model. J Endod. 2007 Jun;33(6):712-4.
Barbosa FOG, Gomes JACP, Araújo MCP. Influence of electrochemical polishing on the mechanical properties of K3 nickel-titanium rotary instruments. J Endod. 2008 Dec;34(12):1533-6. doi: 10.1016/j.joen.2008.08.023..
Koch KA, Brave DG. Real world endo sequence file. Dent Clin North Am. 2004 Jan;48(1):159-82.
Koch K, Brave D. The EndoSequence file: a guide to clinical use. Compend Contin Educ Dent. 2004 Oct;25(10A):811-3.
Mesgouez C, Rilliard F, Matossian L, Nassiri K, Mandel E. Influence of operator experience on canal preparation time when using the rotary Ni-Ti ProFile system in simulated curved canals. Int Endod J. 2003 Mar;36(3):161-5.
Pruett JP, Clement DJ, Carnes-Jr DL. Cyclic fatigue testing of nickeltitanium endodontic instruments. J Endod. 1997 Feb;23(2):77-85.
Yared GM, Bou Dagher FE, Machtou P. Cyclic fatigue of profile rotary instruments after clinical use. Int Endod J. 2000 May;33(3):204-7.
Melo MCC, Bahia MGA, Buono VTL. Fatigue resistance of enginedriven rotary nickel-titanium endodontic instruments. J Endod. 2002 Nov;28(11):765-9.
Eggert C, Peters O, Barbakow F. Wear of nickel-titanium lightspeed instruments evaluated by scanning electron microscopy. J Endod. 1999 Jul;25(7):494-7.
Pessoa OF, Silva JM, Gavini G. Cyclic Fatigue resistance of rotary NiTi Instruments after simulated clinical use in curved root canals. Braz Dent J. 2013;24(2):117-20. doi: 10.1590/0103-6440201302164.
Cho OI, Versluis A, Cheung GS, Ha JH, Hur B, Kim HC. Cyclic fatigue resistance tests of Nickel-Titanium rotary files using simulated canal and weight loading conditions. Restor Dent Endod. 2013 Feb;38(1):31-5. doi: 10.5395/rde.2013.38.1.31.
The Brazilian Journal of Oral Sciences uses the Creative Commons license (CC), thus preserving the integrity of the articles in an open access environment.
Downloads
