Abstract
Objectives
The purpose of this study was to evaluate the effect of different ambient temperatures on cyclic fatigue (CF) life of two NiTi rotary systems and correlate the results with martensitic transformation temperatures.
Materials and methods
Heat-treated NiTi Vortex Blue (VB) and EdgeSequel Sapphire (SP) instruments (tip sizes no. 20, 25, 30, 35, 40) were tested for CF resistance at room and body temperature (n = 20 each group) in a simulated canal (angle of curvature 60°; radius 3 mm; center from instrument tip 4.5 mm) with a motor controlled by an electric circuit. Mean half-life, beta and eta Weibull parameters were determined and compared. Two further instruments of each brand were subjected to differential scanning calorimetry (DSC).
Results
Temperature had an effect on fatigue behavior: all instruments lasted significantly longer at room than at body temperature. All VB significantly outlasted those of SP at body temperature; while smaller diameters of VB (size no. 20) were also significantly more resistant than SP when tested at room temperature; SP with larger diameters (sizes no. 30, no. 35, and no. 40) lasted significantly longer than VB did.
Conclusions
Immersion in water at body temperature was associated with a marked decrease in the fatigue life of all rotary instruments tested. VB instruments were significantly more CF resistant at body temperature and showed the highest predictability in terms of fracture resistance.
Clinical relevance
Rotary instruments manufactured with different post-machining heat treatment responded differently to changed ambient temperatures. DSC assessment of martensitic conversion temperatures helps to predict the behavior of nickel titanium rotaries in different environments.
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References
Walia HM, Brantley WA, Gerstein H (1988) An initial investigation of the bending and torsional properties of nitinol root canal files. J Endod 14:346–351
Pettiette MT, Delano EO, Trope M (2001) Evaluation of success rate of endodontic treatment performed by students with stainless-steel K-files and nickel-titanium hand files. J Endod 27:124–127
Spili P, Parashos P, Messer HH (2005) The impact of instrument fracture on outcome of endodontic treatment. J Endod 31:845–850
Sattapan B, Nervo GJ, Palamara JE, Messer HH (2000) Defects in rotary nickel-titanium files after clinical use. J Endod 26:161–165
Ullmann CJ, Peters OA (2005) Effect of cyclic fatigue on static fracture loads in ProTaper nickel-titanium rotary instruments. J Endod 31:183–186
Zhang EW, Cheung GSP, Zheng YF (2010) Influence of cross-sectional design and dimension on mechanical behavior of nickel-titanium instruments under torsion and bending: a numerical analysis. J Endod 36:1394–1398
Pruett JP, Clement DJ, Carnes DL (1997) Cyclic fatigue testing of nickel-titanium endodontic instruments. J Endod 23:77–85
Jamleh A, Yahata Y, Ebihara A, Atmeh AR, Bakhsh T, Suda H (2016) Performance of NiTi endodontic instrument under different temperatures. Odontology 104:324–328
Plotino G, Grande NM, Mercade Bellido M, Testarelli L, Gambarini G (2017) Influence of temperature on cyclic fatigue resistance of ProTaper Gold and ProTaper Universal rotary files. J Endod 43:200–202
Dosanjh A, Paurazas S, Askar M (2017) The effect of temperature on cyclic fatigue of nickel-titanium rotary endodontic instruments. J Endod 43:823–826
de Vasconcelos RA, Murphy S, Carvalho CA, Govindjee RG, Govindjee S, Peters OA (2016) Evidence for reduced fatigue resistance of contemporary rotary instruments exposed to body temperature. J Endod 42:782–787
EdgeEndo. EdgeSequel™ Sapphire. Twice as good. Half the cost. https://edgeendo.com/edgesequel/. Accessed March 2, 2018
EdgeEndo. EdgeSequel™ heat treated Fire-Wire™ NiTi. https://edgeendo.com/wp-content/uploads/2015/08/DFU-Sequel-Sapphire4.pdf. Accessed March 2, 2018
Directions for use. Vortex Blue rotary files. https://www.dentsplysirona.com/content/dam/dentsply/pim/manufacturer/Endodontics/Glide_Path__Shaping/Rotary__Reciprocating_Files/Shaping/Vortex_Blue_Rotary_Files/Vortex-Blue-ayg107i-en-1402. Accessed March 2, 2018
Arias A, Perez-Higueras JJ, de la Macorra JC (2014) Influence of clinical usage of GT and GTX files on cyclic fatigue resistance. Int Endod J 47:257–263
de Hemptinne F, Slaus G, Vandendael M, Jacquet W, De Moor RJ, Bottenberg P (2015) In vivo intracanal temperature evolution during endodontic treatment after the injection of room temperature or preheated sodium hypochlorite. J Endod 41:1112–1115
Zeltner M, Peters OA, Paque F (2009) Temperature changes during ultrasonic irrigation with different inserts and modes of activation. J Endod 35:573–577
Sonntag D, Raab WH, Martin E, Keppel R (2017) Intracanal use of heated rinsing solutions: a pilot study. Quintessence Int 48:281–285
Sirtes G, Waltimo T, Schaetzle M, Zehnder M (2005) The effects of temperature on sodium hypochlorite short-term stability, pulp dissolution capacity, and antimicrobial efficacy. J Endod 31:669–671
Vera J, Ochoa-Rivera J, Vazquez-Carcaño M, Romero M, Arias A, Sleiman P (2015) Effect of intracanal cryotherapy on reducing root surface temperature. J Endod 41:1884–1887
Vera J, Ochoa J, Romero M, Vazquez-Carcaño M, Ramos-Gregorio CM, Aguilar RR, Cruz A, Sleiman P, Arias A (2018) Intracanal cryotherapy reduces postoperative pain in teeth with symptomatic apical periodontitis: a randomized multicenter clinical trial. J Endod 44:4–8
Nguyen HH, Fong H, Paranjpe A, Flake NM, Johnson JD, Peters OA (2014) Evaluation of the resistance to cyclic fatigue among ProTaper Next, ProTaper Universal, and Vortex Blue rotary instruments. J Endod 40:1190–1193
Hieawy A, Haapasalo M, Zhou H, Wang ZJ, Shen Y (2015) Phase transformation behavior and resistance to bending and cyclic fatigue of ProTaper Gold and ProTaper Universal instruments. J Endod 41:1134–1138
Braga LC, Faria Silva AC, Buono VT, de Azevedo Bahia MG (2014) Impact of heat treatments on the fatigue resistance of different rotary nickel-titanium instruments. J Endod 40:1494–1497
Plotino G, Grande NM, Cotti E, Testarelli L, Gambarini G (2014) Blue treatment enhances cyclic fatigue resistance of vortex nickel-titanium rotary files. J Endod 40:1451–1453
Plotino G, Al-Sudani D, Pulino S, Grande NM, Marcoli PA, Pizzi S et al (2012) Cyclic fatigue resistance of Mtwo NiTi rotary instruments used by experienced and novice operators—an in vivo and in vitro study. Med Sci Monit 18:MT41–MT45
Abernethy RB (2006). The New Weibull Handbook. Reliability and statistical analysis for predicting life, safety, survivability, risk, cost and warranty claims, 5th ed. North Palm Beach, FL
Acknowledgments
This study was performed in partial fulfillment of the requirements for a MSD degree for Dr. Hejlawy and was supported by the AAE Foundation. Dr. OA Peters serves as a consultant for Dentsply Sirona whose support for this study is also acknowledged.
Funding
The work was supported by the AAE foundation.
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Dr. Ove Peters serves as a consultant for Dentsply Sirona. The remaining authors declare that they have no conflict of interest.
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This article does not contain any studies with human participants or animals performed by any of the authors.
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For this type of study, formal consent is not required.
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Arias, A., Hejlawy, S., Murphy, S. et al. Variable impact by ambient temperature on fatigue resistance of heat-treated nickel titanium instruments. Clin Oral Invest 23, 1101–1108 (2019). https://doi.org/10.1007/s00784-018-2543-6
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DOI: https://doi.org/10.1007/s00784-018-2543-6