Sana Ehsen Nagi, Farhan Raza Khan


Background: With root canal treatment, the organic debris and micro-organisms from pulp space is removed and an ideal canal preparation is achieved that is conducive of hermetic obturation. The purpose of this study was to correlate the pre-operative canal curvature with the post-operative curvature in human extracted teeth prepared with K-3 rotary systems. Methods: The root canal preparation was carried out on extracted human molars and premolars using K-3 endodontic rotary files. A pre and post-operative image of the teeth using digital radiograph were taken in order to compare pre and post-operative canal curvature. The images were saved in an images retrieval system (Gendex software, USA). Change in the canal curvature was measured using the software measuring tool (Vixwin software, USA). Student paired t test and Pearson correlation test was applied at 0.05 level of significance. Results: There is a statistically significant difference between pre-operative and post-operative canal curvature (p value <0.001) and a strong positive correlation (91% correlation) between pre-operative and post-operative canal curvature in teeth prepared with the K-3 rotary files. Conclusions: A significant difference between pre and post instrumentation curvature was found. Degree of canal curvature was not correlated with time taken for canal preparation.

Keywords:  Endodontic treatment; K-3 files; Canal curvature

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Tyagi A, Prasad K, Shashikala K. Evaluation of Effectiveness of Cleaning of Root Canals using Protaper and K3 Rotary Systems: A Sem Study. World J Dent 2015;6(1):20–5.

Duran-Sindreu F, García M, Olivieri JG, Mercadé M, Morelló S, Roig M. A comparison of apical transportation between FlexMaster and Twisted Files rotary instruments. J Endod 2012;38(7):993–5.

Ha JH, Kim SR, Versluis A, Cheung GSP, Kim JW, Kim HC. Elastic Limits in Torsion of Reciprocating Nickel-Titanium Instruments. J Endod 2015;41(5):715–9.

Guelzow A, Stamm O, Martus P, Kielbassa AM. Comparative study of six rotary nickel–titanium systems and hand instrumentation for root canal preparation. Int Endod J 2005;38(10):743–52.

Young G, Parashos P, Messer HH. The principles of techniques for cleaning root canals. Aust Dent J 2007;52(1 Suppl):S52–63.

Ebihara A, Yahata Y, Miyara K, Nakano K, Hayashi Y, Suda H. Heat treatment of nickel–titanium rotary endodontic instruments: effects on bending properties and shaping abilities. Int Endod J 2011;44(9):843–9.

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;36(3):199–207.

Alattar S, Nehme W, Diemer F, Naaman A. The Influence of Brushing Motion on the Cutting Behavior of 3 Reciprocating Files in Oval-shaped Canals. J Endod 2015;41(5):703–9.

Hartmann MS, Barletta FB, Camargo Fontanella VR, Vanni JR. Canal Transportation after Root Canal Instrumentation: A Comparative Study with Computed Tomography. J Endod 2007;33(8):962–5.

Loizides AL, Kakavetsos VD, Tzanetakis GN, Kontakiotis EG, Eliades G. A comparative study of the effects of two nickel–titanium preparation techniques on root canal geometry assessed by microcomputed tomography. J Endod 2007;33(12):1455–9.

Peters OA. Current challenges and concepts in the preparation of root canal systems: a review. J Endod 2004;30(8):559–67.

Stern S, Patel S, Foschi F, Sherriff M, Mannocci F. Changes in centring and shaping ability using three nickel–titanium instrumentation techniques analysed by micro-computed tomography (μCT). Int Endod J 2012;45(6):514–23.

Walsch H. The hybrid concept of nickel–titanium rotary instrumentation. Dent Clin North Am 2004;48(1):183–202.

Ankrum MT, Hartwell GR, Truitt JE. K3 Endo, ProTaper, and ProFile systems: breakage and distortion in severely curved roots of molars. J Endod 2004;30(4):234–7.

Celikten B, Uzuntas CF, Kursun S, Orhan AI, Tufenkci P, Orhan K, et al. Comparative evaluation of shaping ability of two nickel-titanium rotary systems using cone beam computed tomography. BMC Oral Health 2015;15(1):32.

Hilfer PB, Bergeron BE, Mayerchak MJ, Roberts HW, Jeansonne BG. Multiple autoclave cycle effects on cyclic fatigue of nickel-titanium rotary files produced by new manufacturing methods. J Endod 2011;37(1):72–4.

Schäfer E, Erter M, Dammaschke T. Comparative study on the shaping ability and cleaning efficiency of rotary Mtwo® instruments Part 2. Cleaning effectiveness and shaping ability in severely curved root canals of extracted teeth. Int Endod J 2006;39(3):203–12.

Bergmans L, Van Cleynenbreugel J, Beullens M, Wevers M, Van Me B, Lambrechts P. Progressive versus constant tapered shaft design using NiTi rotary instruments. Int Endod J 2003;36(4):288–95.

El Batouty KM, Elmallah WE. Comparison of canal transportation and changes in canal curvature of two nickel-titanium rotary instruments. J Endod 2011;37(9):1290–2.

Rödig T, Hülsmann M, Kahlmeier C. Comparison of root canal preparation with two rotary NiTi instruments: ProFile. 04 and GT Rotary. Int Endod J 2007;40(7):553–62.

Gluskin AH, Brown DC, Buchanan LS. A reconstructed computerized tomographic comparison of Ni–Ti rotary GT™ files versus traditional instruments in canals shaped by novice operators. Int Endod J 2001;34(6):476–84.

ElAyouti A, Dima E, Judenhofer MS, Löst C, Pichler BJ. Increased apical enlargement contributes to excessive dentin removal in curved root canals: a stepwise microcomputed tomography study. J Endod 2011;37(11):1580–4.

Yun HH, Kim SK. A comparison of the shaping abilities of 4 nickel-titanium rotary instruments in simulated root canals. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2003;95(2):228–33.


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