head JofIMAB
Journal of IMAB - Annual Proceeding (Scientific Papers)
Publisher: Peytchinski Publishing Ltd.
ISSN: 1312-773X (Online)
Issue: 2020, vol. 26, issue3
Subject Area: Dental Medicine
DOI: 10.5272/jimab.2020263.3288
Published online: 13 August 2020

Original article

J of IMAB. 2020 Jul-Sep;26(3):3288-3292
Irina Tsenova-IlievaORCID logo Corresponding Autoremail, Radosveta VassilevaORCID logo, Emilia KarovaORCID logo,
Department of Conservative Dentistry, Faculty of Dental Medicine, Medical University - Sofia, Bulgaria.

Purpose: The aim of the current study was to assess the dentinal damage after shaping of oval-shaped root canals of lower incisors with SAF by means of micro-computed tomography.
Materials and methods: Twenty single-rooted, non-endodontically treated lower incisors with straight roots were included in the experiment. The specimens were scanned using high-resolution micro-computed tomographic imaging before and after root canal preparation with 1.5 mm Self-adjusting file. Preoperative and postoperative cross-sectional images of the teeth were screened to identify the presence of dentinal defects. The McNemar test was used to determine significant differences before and after instrumentation. The level of significance was set at p≤0.05.
Results: The Self-adjusting file system insignificantly increased the percentage rate of microcracks in root canals of lower incisors compared with preoperative specimens (p>0.05).
Conclusions: The shaping of oval-shaped root canals with Self-adjusting file did not result in significant damage of radicular dentin.

Keywords: root canalshaping, dentinal microcracks, Self-adjusting filesystem, micro-computed tomography,

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Please cite this article as: Tsenova-Ilieva I, Vassileva R, Karova E. A micro-CT assessment of dentinal damage after shaping of oval-shaped root canals. J of IMAB. 2020 Jul-Sep;26(3):3288-3292.
DOI: 10.5272/jimab.2020263.3288

Corresponding AutorCorrespondence to: Irina Tsenova-Ilieva, Department of Conservative Dentistry, Faculty of Dental Medicine, Medical University – Sofia; 1, St Georgi Sofiyski Blvd., 1413 Sofia, Bulgaria; E-mail: irinatsenova@yahoo.com

1. Tsenova I, Vassileva R, Karova E. Incidence of dentinal microcracks after root canal preparation with two reciprocating systems: a stereomicroscopic study. J of IMAB. 2018 Oct-Dec;24(4):2245-2249. [Crossref].
2. Versiani A, Souza E, De-Deus G. Critical appraisal of studies on dentinal radicular microcracks in endodontics: methodological issues, contemporary concepts, and future perspectives. Endod Topics. 2015 Nov;33(1):87–156. [Crossref]
3. Karova E. Properties of nickel-titanium alloy. In Nickel-titanium rotary instruments - a guide for students. Sofia: Valdex Ltd. 2015. 120 p.
4. Liu R, Hou BX, Wesselink PR, Shemesh H. The incidence of root microcracks caused by 3 different single-file systems versus the ProTaper system. J Endod. 2013 Aug;39(8):1054–1056. [PubMed] [Crossref]
5. Al-Zaka IM. The effects of canal preparation by different NiTi rotary instruments and reciprocating WaveOne on the incidence of dentinal defects. M Dent J. 2012;9(2):137–142. [Crossref]
6. Kim HC, Lee MH, Yum J, Versluis A, Lee CJ, Kim BM. Potential relationship between design and vertical root fracture. J Endod, 2010 Jul;36(7):1195–1199. [PubMed] [Crossref]
7. Tsenova I, Vassileva R, Karova E. The ability of root canal cleaning and shaping procedures to initiate dentinal radicular microcracks. Int J Sci Res. 2018 Aug;7(8):1558–1565.
8. Hof R, Perevalov V, Eltanani M, Zary R, Metzger Z. The self-adjusting file (SAF). Part 2: mechanical analysis. J Endod. 2010Apr;36(4):691-6. [PubMed] [Crossref]
9. Metzger Z, Teperovich E, Zary R, Cohen R, Hof R. The self-adjusting file (SAF). Part 1: respecting the root canal anatomy-a new concept of endodontic files and its implementation. J Endod, 2010 Apr;36(4):679–690. [PubMed] [Crossref]
10. Wu MK, Roris A, Barkis D, Wesselink PR. Prevalence and extent of long oval canals in the apical third. Oral Surg Oral Med Oral Pathol Oral RadiolEndod, 2000 Jun;89(6):739–743. [PubMed] [Crossref]
11.Lertchirakarn V, Palmara JE, Messer HH. Patterns of vertical root fracture: factors affecting stress distribution in the root canal. J Endod. 2003 Aug;29(8):523–528. [PubMed] [Crossref]
12. De-Deus G, Belladonna FG, Silva EJNL, Souza EM, Carvalhal JCA, Perez R, et al. Micro-CT assessment of dentinal microcracks after root canal filling procedures. IntEndod J.2017 Sep;50(9):895–901. [PubMed] [Crossref]
13. De-Deus G, Carvalhal JCA, Belladonna FG, Silva EJNL, Lopes RT, Moreira Filho RE, et al. Dentinal microcrack development after canal preparation: a longitudinal in situ micro-computed tomography study using a cadaver model. J Endod. 2017 Sep;43(9):1553–1558.  [PubMed] [Crossref]
14. Tsenova I, Vassileva R, Karova E. Damages to radicular dentin during root canal filling and retreatment procedures: analysis, evaluation methods and methodological issues. Int J Sci Res. 2018 Oct;7(10):524–533.
15. De-Deus G, Belladonna FG, Marins JR, Silva EJ, Neves AA, Souza EM, et al. On the casuality between dentinal defects and root canal preparation: a micro-CT assessment. Braz Dent J. 2016 Oct-Dec;27(6):664–669. [PubMed] [Crossref]
16. Oliveira BP, Câmara AC, Duarte DA, Heck RJ, Antonino ACD, Aguiar CM. Effect of reciprocating systems and working lengths on apical microcrack development: a micro-CT study. Braz Dent J. 2017Nov-Dec;28(6): 710–714. [PubMed] [Crossref]
17. Rödig T, Krämer J, Müller C, Wiegand A, Haupt F, Rizk M.Incidence of microcracks after preparation of straight and curved root canals with three different NiTi instrumentation techniques assessed by micro-CT. Aust Endod J. 2019 Dec;45(3):394-399. [PubMed] [Crossref]
18. Bayram HM, Bayram E, Ocak M, Uygun AD, Celik HH. Effect of ProTaper Gold, Self-Adjusting File, and XP-endo Shaper instruments on dentinal microcrack formation: a micro-computed tomographic study. J Endod. 2017 Jul;43(7):1166–1169. [PubMed] [Crossref]
19. Zuolo ML, De-Deus G, Belladonna FG, Silva EJ, Lopes RT, Souza EM, et al. Micro-computed tomography assessment of dentinal micro-cracks after root canal preparation with TRUShape and Self-Adjusting File systems. J Endod. 2017 Apr;43(4):619–622. [PubMed] [Crossref]
20. Kim HC, Cheung GS, Lee CJ, Kim BM, Park JK, Kang SI. Comparison of forces generated during root canalshaping and residual stresses of three nickel-titanium rotary files by using a three-dimensional finite-element analysis. J Endod. 2008 Jun;34(6):743–747. [PubMed] [Crossref].

Received: 12 September 2019
Published online: 13 August 2020

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