Journal of Contemporary Dentistry

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VOLUME 7 , ISSUE 2 ( May-August, 2017 ) > List of Articles

ORIGINAL RESEARCH

Comparison of the Effects of Three Different Nickel–titanium Rotary Instruments on the Fracture Resistance of Obturated Roots: An in vitro Study

Vanitha U Shenoy, Ritesh B Pawar, Sumanthini MV, Saimanaaz AH Shaikh

Citation Information : Shenoy VU, Pawar RB, MV S, Shaikh SA. Comparison of the Effects of Three Different Nickel–titanium Rotary Instruments on the Fracture Resistance of Obturated Roots: An in vitro Study. J Contemp Dent 2017; 7 (2):86-90.

DOI: 10.5005/jp-journals-10031-1191

License: CC BY 3.0

Published Online: 01-08-2017

Copyright Statement:  Copyright © 2017; The Author(s).


Abstract

Aim

The aim of the article is to compare the effects of three different nickel–titanium (NiTi) rotary instruments on the fracture resistance of obturated roots.

Materials and methods

A total of 100 permanent mandibular premolars were randomly divided into four groups of 25 teeth each and biomechanical preparation was done: group I: stainless steel K-hand files (HFs), group II: ProTaper NiTi instruments (PT), group III: HyFlex CM NiTi instruments (HCM), and group IV: K3XF NiTi instruments. Following root canal preparation, the canals were obturated using lateral condensation. A light body silicone impression material was used to simulate the periodontal ligament (PDL). Fracture resistance was tested in an Instron testing machine.

Statistical analysis

Data were analyzed with Kruskal–Wallis test.

Results

There was no difference in significance (p < 0.05) among the different groups tested with respect to their fracture resistances.

Conclusion

The present study concluded that rotary instrumentation could result in an increased chance for dentinal defects as compared with hand instrumentation. Greater taper rotary NiTi instruments do not increase the fracture susceptibility of roots, which in turn depends on various factors other than instrumentation alone.

Clinical significance

Greater taper achieved by rotary NiTi files during canal preparation facilitates efficient irrigation and complete debridement. Root fracture might occur as a result of microcracks or craze lines that propagate with repeated stress application by occlusal forces and also during canal preparation. Based on the results obtained, it can be decided whether the use of the newer rotary NiTi system contributes to endodontic success and long-term survival of endodontically treated teeth.

How to cite this article

Shaikh SAH, Shenoy VU, Sumanthini MV, Pawar RB. Comparison of the Effects of Three Different Nickel–titanium Rotary Instruments on the Fracture Resistance of Obturated Roots: An in vitro Study. J Contemp Dent 2017;7(2):86-90.


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  1. An initial investigation of the bending and torsional properties of Nitinol root canal files. J Endod 1988 Jul;14(7):346-351.
  2. A review of cyclic fatigue testing of nickel-titanium rotary instruments. J Endod 2009 Nov;35(11):1469-1476.
  3. An overview of nickel-titanium alloys used in dentistry. Int Endod J 2000 Jul;33(4):297-310.
  4. Cyclic fatigue testing of nickel-titanium endodontic instruments. J Endod 1997 Feb;23(2):77-85.
  5. The effect of root preparation technique and instrumentation length on the development of apical root cracks. J Endod 2009 Mar;35(3):389-392.
  6. The relationship of root canal enlargement to finger-spreader induced vertical root fracture. J Endod 1997 Aug;23(8):533-534.
  7. Dentinal microcrack formation during root canal preparations by different NiTi rotary instruments and the self-adjusting file. J Endod 2012 Feb;38(12):232-235.
  8. Potential relationship between design of NiTi instruments and vertical root fracture. J Endod 2010 Jul;36(7):1195-1199.
  9. The ability of different nickel-titanium rotary instruments to induce dentinal damage during canal preparation. J Endod 2009 Feb;35(2):236-238.
  10. Incidence of apical root cracks and apical dentinal detachments after canal preparation with hand and rotary files at different instrumentation lengths. J Endod 2013 Jan;39(1):129-132.
  11. Effects of self-adjusting file, Mtwo, and ProTaper on the root canal wall. J Endod 2013 Feb;39(2):262-264.
  12. Influence of instrument taper on the resistance to fracture of endodontically treated roots. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2006 Jan;101(1):126-131.
  13. Fracture resistance of endodontically treated roots using different preparation-obturation combinations. Tanta Dent J 2013 Aug;10(2):97-102.
  14. Lateral condensation stress in root canals. J Endod 1981 Apr;7(4):151-155.
  15. Fracture strength of tooth roots following canal preparation by hand and rotary instrumentation. J Endod 2005 Jul;31(7):529-532.
  16. Assessment of dentinal damage during canal preparation using reciprocating and rotary files. J Endod 2014 Sep;40(9):1443-1446.
  17. Effects of ProTaper Universal, ProTaper Next and HyFlex instruments on crack formation in dentin. J Endod 2014 Sep;40(9):1482-1484.
  18. Fracture resistance of teeth obturated with gutta percha and resilon: an in vitro study. J Conserv Dent 2010 Jul;13(2):61-64.
  19. In vitro resistance to fracture of roots obturated with resilon or gutta-percha. J Endod 2011 Jun;37(6):828-831.
  20. Spreader load required for vertical root fracture during lateral compaction ex vivo: evaluation of periodontal simulation and fracture load information. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2008 Aug;106(2):e64-e70.
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