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VOLUME 14 , ISSUE 4 ( July-August, 2013 ) > List of Articles


Comparison of the Remaining Dentin Thickness in the Root after Hand and Four Rotary Instrumentation Techniques: An in vitro Study

Johnson K Issac, MS Rama Rao, Abdul Shameem, Rashmi Nair, Sureshbabu Ghanta, Rekha P Thankachan

Citation Information : Issac JK, Rao MR, Shameem A, Nair R, Ghanta S, Thankachan RP. Comparison of the Remaining Dentin Thickness in the Root after Hand and Four Rotary Instrumentation Techniques: An in vitro Study. J Contemp Dent Pract 2013; 14 (4):712-717.

DOI: 10.5005/jp-journals-10024-1389

Published Online: 01-12-2013

Copyright Statement:  Copyright © 2013; The Author(s).



The aim of the present study was to compare the remaining dental thickness (RDT) in the mesiobuccal root of mandibular first molars at 3 and 7 mm from the anatomic apex after instrumentation with ProTaper, light speed LSX, K3 and M2 and to compare with that of K-files.

Materials and methods

In this study, 60 extracted, untreated human mandibular first molars with fully formed apices, with curvature less than 35° and no root resorption were used. Prepared specimens were cut horizontally at 3 and 7 mm short of anatomic apex. The least dentin thickness from canal to external root surface was observed under 3× magnification and recorded using Clemax measuring tool and the sections were reassembled. Group I—instrumentation with ProTaper, group II—instrumentation with K3, group III—instrumentation with Light Speed LSX, group IV—instrumentation with M2 and group V— instrumentation with K-files and RDT was measured.


Results showed that group V removed lesser amount of dentin compared to all other groups while all the three instrumentation techniques removed almost equal amount of dentin apically.

Clinical significance

Cleaning and shaping of the root canal space involves the elimination of pathogenic contents as well as attaining a uniform specific shape. However, the RDT following the use of various intraradicular procedures is an important factor to be considered as an iatrogenic cause that may result in root fracture. To avoid this, newer rotary instruments are being introduced.

How to cite this article

Rao MSR, Shameem A, Nair R, Ghanta S, Thankachan RP, Issac JK. Comparison of the Remaining Dentin Thickness in the Root after Hand and Four Rotary Instrumentation Techniques: An in vitro Study. J Contemp Dent Pract 2013;14(4):712-717.

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  1. Thickness of cementum/dentin in mesial roots of mandibular first molars. J Endodon 1992;18(11):545-548.
  2. Cleaning and shaping the root canal. Dent Clin North Am 1974;18:269-296.
  3. Canal preparation with Hero 642 rotary NiTi instruments compared with stainless steel hand K-file assessed using computed tomography. Int Endod J 2005;38(6):402-408.
  4. Preparation of space for posting: effect on thickness of canal walls and incidence of perforation in molars. J Am Dent Assoc 1982;104(6):834-837.
  5. Current challenges and concepts in the preparation of root canal systems: a review. J Endod 2004;30:559-567.
  6. Comparative study of six rotary nickel-titanium systems and hand instrumentation for root canal preparation. Int Endod J. 2005;38(10):743-752.
  7. CT evaluation of canal preparation using rotary and hand NiTi instruments: An in vitro study. J Conserv Dent 2010;13(1):16-22.
  8. ProTaper NT system. Dent Clin North Am 2004;48:87-111.
  9. Cross-sectional analysis of root canals prepared with NiTi rotary instruments and stainless steel reciprocating files. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2008;106:70-76.
  10. Mechanical root canal preparation with NiTi rotary instruments: rationale, performance and safety. Status report for the American Journal of Dentistry. Am J Dent 2001;14:324-333.
  11. Dentine removal in the coronal portion of the root canals following two preparation techniques. Int Endod J 2007;40:852-858.
  12. Shaping ability of ProFile.04 Taper Series 29 rotary nickel-titanium instruments in simulated root canals. Part 2. Int Endod J 1997;30:8-15.
  13. Radiograohic measurement of residual root thickness in premolars with post preparation. J Endod 2001;27:296-298.
  14. The effectiveness of manual and rotary techniques in the cleaning of root canals: a scanning electron microscopy study. Int Endod J 2001;34:533-537.
  15. In vitro comparative study of manual and mechanical rotary instrumentation of root canals using computed tomography. Braz Dent J 2007;18(4):289-293.
  16. A methodology for evaluation of root canal instrumentation. J Endod 1987;13:243-245.
  17. A comparison of light speed LS1 and lightspeed LSX NiTi rotary instruments in apical transportation and length control in simulated root canals. J Endodon 2007;33(3): 268-271.
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