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Research Article
Incidence of apical crack formation and propagation during removal of root canal filling materials with different engine driven nickel-titanium instruments
Taha Özyürek, Vildan Tek, Koray Yılmaz, Gülşah Uslu
Restor Dent Endod 2017;42(4):332-341.   Published online November 4, 2017
DOI: https://doi.org/10.5395/rde.2017.42.4.332
AbstractAbstract PDFPubReaderePub
Objectives

To determine the incidence of crack formation and propagation in apical root dentin after retreatment procedures performed using ProTaper Universal Retreatment (PTR), Mtwo-R, ProTaper Next (PTN), and Twisted File Adaptive (TFA) systems.

Materials and Methods

The study consisted of 120 extracted mandibular premolars. One millimeter from the apex of each tooth was ground perpendicular to the long axis of the tooth, and the apical surface was polished. Twenty teeth served as the negative control group. One hundred teeth were prepared, obturated, and then divided into 5 retreatment groups. The retreatment procedures were performed using the following files: PTR, Mtwo-R, PTN, TFA, and hand files. After filling material removal, apical enlargement was done using apical size 0.50 mm ProTaper Universal (PTU), Mtwo, PTN, TFA, and hand files. Digital images of the apical root surfaces were recorded before preparation, after preparation, after obturation, after filling removal, and after apical enlargement using a stereomicroscope. The images were then inspected for the presence of new apical cracks and crack propagation. Data were analyzed with χ2 tests using SPSS 21.0 software.

Results

New cracks and crack propagation occurred in all the experimental groups during the retreatment process. Nickel-titanium rotary file systems caused significantly more apical crack formation and propagation than the hand files. The PTU system caused significantly more apical cracks than the other groups after the apical enlargement stage.

Conclusions

This study showed that retreatment procedures and apical enlargement after the use of retreatment files can cause crack formation and propagation in apical dentin.

Citations

Citations to this article as recorded by  
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  • A comparative evaluation of the dentinal microcracks formed and propagated during the removal of gutta-percha using hand and three rotary retreatment file systems: A micro-computed tomography study
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  • Evaluation of Dentinal Crack Propagation, Amount of Gutta Percha Remaining and Time Required During Removal of Gutta Percha Using Two Different Rotary Instruments and Hand Instruments - An In vitro Study
    S Tejaswi, A Singh, S Manglekar, UK Ambikathanaya, S Shetty
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  • The Influence of Root Canal Preparation with ProTaper Next, WaveOne Gold, and Twisted Files on Dentine Crack Formation
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    Machines.2021; 9(12): 332.     CrossRef
  • The potential effect of instrumentation with different nickel titanium rotary systems on dentinal crack formation—An in vitro study
    Márk Fráter, András Jakab, Gábor Braunitzer, Zsolt Tóth, Katalin Nagy, Andrej M. Kielbassa
    PLOS ONE.2020; 15(9): e0238790.     CrossRef
  • Micro–computed Tomographic Assessment of the Residual Filling Volume, Apical Transportation, and Crack Formation after Retreatment with Reciproc and Reciproc Blue Systems in Curved Root Canals
    Damla Kırıcı, Sezer Demirbuga, Ertuğrul Karataş
    Journal of Endodontics.2020; 46(2): 238.     CrossRef
  • Force and vibration generated in apical direction by three endodontic files of different kinematics during simulated canal preparation: An in vitro analytical study
    Ankit Nayak, PK Kankar, Prashant K Jain, Niharika Jain
    Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine.2019; 233(8): 839.     CrossRef
  • Effect of Aging on Dentinal Crack Formation after Treatment and Retreatment Procedures: a Micro-CT Study
    Lilian Rachel de Lima Aboud, Bernardo Camargo dos Santos, Ricardo Tadeu Lopes, Leonardo Aboud Costa Viana, Miriam Fátima Zaccaro Scelza
    Brazilian Dental Journal.2018; 29(6): 530.     CrossRef
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