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CC BY-NC-ND 4.0 · Eur J Dent 2016; 10(02): 183-187
DOI: 10.4103/1305-7456.178314
Original Article
Dental Investigation Society

Mechanical behavior of deep cryogenically treated martensitic shape memory nickel–titanium rotary endodontic instruments

Thilla Sekar Vinothkumar
1   Department of Conservative Dentistry and Endodontics, Faculty of Dental Sciences, Sri Ramachandra University, Porur, Chennai, Tamil Nadu, India
,
Deivanayagam Kandaswamy
1   Department of Conservative Dentistry and Endodontics, Faculty of Dental Sciences, Sri Ramachandra University, Porur, Chennai, Tamil Nadu, India
,
Gopalakrishnan Prabhakaran
2   Department of Mechanical Engineering, Velammal Engineering College, Chennai, Tamil Nadu, India
,
Arunachalam Rajadurai
3   Department of Production Technology, Madras Institute of Technology, Anna University, Chennai, Tamil Nadu, India
› Author Affiliations
Further Information

Publication History

Publication Date:
23 September 2019 (online)

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ABSTRACT

Objectives: The aim of this study was to investigate the role of deep cryogenic treatment (DCT) on the cyclic fatigue resistance and cutting efficiency of martensitic shape memory (SM) nickel–titanium (NiTi) rotary endodontic instruments. Materials and Methods: Seventy-five HyFlex® CM instruments were randomly divided into three groups of 25 each and subjected to different DCT (–185°C) conditions based on soaking time: DCT 24 group: 24 h, DCT 6 group: 6 h, and control group. Each group was randomly subdivided for evaluation of cyclic fatigue resistance in custom-made artificial canals (n = 15) and cutting efficiency in plexiglass simulators (n = 10). The cyclic fatigue resistance was measured by calculating the number of cycles to failure (NCF) and cutting efficiency was measured using the loss of weight method. Results: Increase in NCF of instruments in DCT 24 group was highly significant (P < 0.01; Tukey's honest significant difference). There was no difference in weight loss of plexiglass simulators in all the groups (P > 0.05; one-way analysis of variance). In conclusion, deep dry cryogenic treatment with 24 h soaking time significantly increases the cyclic fatigue resistance without affecting the cutting efficiency of SM NiTi endodontic instruments.

Key words:

Cutting efficiency - cyclic fatigue - deep cryogenic treatment - nickel–titanium - shape memory
 

  • REFERENCES

  • 1 Shen Y, Cheung GS. Methods and models to study nickel-titanium instruments. Endod Topics 2013; 29: 18-41
    CrossrefGoogle Scholar
  • 2 Parashos P, Messer HH. Rotary NiTi instrument fracture and its consequences. J Endod 2006; 32: 1031-43
    CrossrefPubMedGoogle Scholar
  • 3 Haapasalo M, Shen Y. Evolution of nickel-titanium instruments: From past to future. Endod Topics 2013; 29: 3-17
    CrossrefGoogle Scholar
  • 4 Testarelli L, Plotino G, Al-Sudani D, Vincenzi V, Giansiracusa A, Grande NM. et al. Bending properties of a new nickel-titanium alloy with a lower percent by weight of nickel. J Endod 2011; 37: 1293-5
    CrossrefPubMedGoogle Scholar
  • 5 Coltene Endo. Hyflex CM Brochure. Available from: http://www.coltene.com/download.php?file_id=5085 . [Last accessed on 2015 Mar 12]
    Google Scholar
  • 6 Peters OA, Gluskin AK, Weiss RA, Han JT. An in vitro assessment of the physical properties of novel Hyflex nickel-titanium rotary instruments. Int Endod J 2012; 45: 1027-34
    CrossrefPubMedGoogle Scholar
  • 7 Lal DM, Renganarayanan S, Kalanidhi A. Cryogenic treatment to augment wear resistance of tool and die steels. Cryogenics 2001; 41: 149-55
    CrossrefGoogle Scholar
  • 8 Bensely A, Senthilkumar D, Lal DM, Nagarajan G, Rajadurai A. Effect of cryogenic treatment on tensile behavior of case carburized steel-815M17. Mater Charact 2007; 58: 485-91
    CrossrefGoogle Scholar
  • 9 Vinothkumar TS, Miglani R, Lakshminarayananan L. Influence of deep dry cryogenic treatment on cutting efficiency and wear resistance of nickel-titanium rotary endodontic instruments. J Endod 2007; 33: 1355-8
    CrossrefPubMedGoogle Scholar
  • 10 Barron RF. Cryogenic treatment of metals to improve wear resistance. Cryogenics 1982; 22: 409-13
    CrossrefGoogle Scholar
  • 11 Vinothkumar TS, Kandaswamy D, Prabhakaran G, Rajadurai A. Microstructure of cryogenically treated martensitic shape memory nickel-titanium alloy. J Conserv Dent 2015; 18: 292-6
    CrossrefPubMedGoogle Scholar
  • 12 Fayyad DM, Elhakim ElgendyAA. Cutting efficiency of twisted versus machined nickel-titanium endodontic files. J Endod 2011; 37: 1143-6
    CrossrefPubMedGoogle Scholar
  • 13 Pruett JP, Clement DJ, Carnes Jr DL. Cyclic fatigue testing of nickel-titanium endodontic instruments. J Endod 1997; 23: 77-85
    CrossrefPubMedGoogle Scholar
  • 14 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: 1469-76
    CrossrefPubMedGoogle Scholar
  • 15 Plotino G, Grande NM, Sorci E, Malagnino VA, Somma F. A comparison of cyclic fatigue between used and new Mtwo Ni-Ti rotary instruments. Int Endod J 2006; 39: 716-23
    CrossrefPubMedGoogle Scholar
  • 16 Gambarini G, Grande NM, Plotino G, Somma F, Garala M, De Luca M. et al. Fatigue resistance of engine-driven rotary nickel-titanium instruments produced by new manufacturing methods. J Endod 2008; 34: 1003-5
    CrossrefPubMedGoogle Scholar
  • 17 Rapisarda E, Bonaccorso A, Tripi TR, Condorelli GG. Effect of sterilization on the cutting efficiency of rotary nickel-titanium endodontic files. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 1999; 88: 343-7
    CrossrefPubMedGoogle Scholar
  • 18 Ninan E, Berzins DW. Torsion and bending properties of shape memory and superelastic nickel-titanium rotary instruments. J Endod 2013; 39: 101-4
    CrossrefPubMedGoogle Scholar
  • 19 Reasbeck RB. Improved tool life by the cryotough treatment. Metallurgia 1989; 56: 178-9
    Google Scholar
  • 20 Singh PJ, Guha B, Achar DR. Fatigue life improvement of AISI 304L cruciform welded joints by cryogenic treatment. Eng Fail Anal 2003; 10: 1-12
    CrossrefGoogle Scholar
  • 21 Vinothkumar TS, Kandaswamy D, Prabhakaran G, Rajadurai A. Effect of dry cryogenic treatment on Vickers hardness and wear resistance of new martensitic shape memory nickel-titanium alloy. Eur J Dent 2015; 9: 513-7
    Article in Thieme ConnectPubMedGoogle Scholar
  • 22 Brockhurst P, Hsu E. Hardness and strength of endodontic instruments made from NiTi alloy. Aust Endod J 1998; 24: 115-9
    CrossrefPubMedGoogle Scholar
  • 23 Zinelis S, Eliades T, Eliades G. A metallurgical characterization of ten endodontic Ni-Ti instruments: Assessing the clinical relevance of shape memory and superelastic properties of Ni-Ti endodontic instruments. Int Endod J 2010; 43: 125-34
    CrossrefPubMedGoogle Scholar
  • 24 Shen Y, Coil JM, Zhou H, Zheng Y, Haapasalo M. HyFlex nickel-titanium rotary instruments after clinical use: Metallurgical properties. Int Endod J 2013; 46: 720-9
    CrossrefPubMedGoogle Scholar
  • 25 Plotino G, Grande NM, Melo MC, Bahia MG, Testarelli L, Gambarini G. Cyclic fatigue of NiTi rotary instruments in a simulated apical abrupt curvature. Int Endod J 2010; 43: 226-30
    CrossrefPubMedGoogle Scholar
  • 26 Schäfer E, Diez C, Hoppe W, Tepel J. Roentgenographic investigation of frequency and degree of canal curvatures in human permanent teeth. J Endod 2002; 28: 211-6
    CrossrefPubMedGoogle Scholar
  • 27 Avoaka MC, Haïkel Y. Influence of axial movement on fatigue of ProFile Ni-Ti rotary instruments: An in vitro evaluation. Bosn J Basic Med Sci 2010; 10: 107-11
    PubMedGoogle Scholar
  • 28 Shen Y, Zhou HM, Zheng YF, Campbell L, Peng B, Haapasalo M. Metallurgical characterization of controlled memory wire nickel-titanium rotary instruments. J Endod 2011; 37: 1566-71
    CrossrefPubMedGoogle Scholar
  • 29 Uchil J. Shape memory alloys – Characterization techniques. J Phys 2002; 58: 1131-9
    Google Scholar
  • 30 Kalsi NS, Sehgal R, Sharma VS. Cryogenic treatment of tool materials: A review. Mater Manuf Process 2010; 25: 1077-100
    CrossrefGoogle Scholar
  • 31 Zhou H, Peng B, Zheng YF. An overview of the mechanical properties of nickel-titanium endodontic instruments. Endod Topics 2013; 29: 42-54
    CrossrefGoogle Scholar
  • 32 Abedini M, Ghasemi HM, Nili AhmadabadiM. Tribological behavior of NiTi alloy in martensitic and austenitic states. Mater Des 2009; 30: 4493-7
    CrossrefGoogle Scholar
  • 33 Yguel-Henry S, von Stebut J. Cutting efficiency loss of root canal instruments due to bulk plastic deformation, surface damage, and wear. J Endod 1994; 20: 367-72
    CrossrefPubMedGoogle Scholar
  • 34 Morgental RD, Vier-Pelisser FV, Kopper PM, de Figueiredo JA, Peters OA. Cutting efficiency of conventional and martensitic nickel-titanium instruments for coronal flaring. J Endod 2013; 39: 1634-8
    CrossrefPubMedGoogle Scholar
  • 35 Shen Y, Haapasalo M. Three-dimensional analysis of cutting behavior of nickel-titanium rotary instruments by microcomputed tomography. J Endod 2008; 34: 606-10
    CrossrefPubMedGoogle Scholar
  • 36 Machian GR, Peters DD, Lorton L. The comparative efficiency of four types of endodontic instruments. J Endod 1982; 8: 398-402
    CrossrefPubMedGoogle Scholar