A micro-computed tomographic evaluation of dentinal microcrack alterations during root canal preparation using single‑file Ni‑Ti systems

Li,Mei‑Lin; Liao,Wei‑Li; Cai,Hua‑Xiong

doi:10.3892/etm.2017.5399

A micro-computed tomographic evaluation of dentinal microcrack alterations during root canal preparation using single‑file Ni‑Ti systems

Authors:
- Mei‑Lin Li
- Wei‑Li Liao
- Hua‑Xiong Cai
View Affiliations

Affiliations: Department of Oral Medicine, Haizhu Square Branch, Stomatological Hospital, Southern Medical University (Guangdong Provincial Stomatological Hospital), Guangzhou, Guangdong 510280, P.R. China, Zhujiang New Town Dental Clinic, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat‑Sen University, Guangzhou, Guangdong 510060, P.R. China
Published online on: October 30, 2017 https://doi.org/10.3892/etm.2017.5399
Pages: 494-499
Copyright: © Li et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

Metrics: Total Views: 0 (Spandidos Publications: | PMC Statistics: )

Metrics: Total PDF Downloads: 0 (Spandidos Publications: | PMC Statistics: )

Cited By (CrossRef): 0 citations Loading Articles...

Abstract

The aim of the present study was to evaluate the length of dentinal microcracks observed prior to and following root canal preparation with different single‑file nickel‑titanium (Ni‑Ti) systems using micro‑computed tomography (micro‑CT) analysis. A total of 80 mesial roots of mandibular first molars presenting with type II Vertucci canal configurations were scanned at an isotropic resolution of 7.4 µm. The samples were randomly assigned into four groups (n=20 per group) according to the system used for root canal preparation, including the WaveOne (WO), OneShape (OS), Reciproc (RE) and control groups. A second micro‑CT scan was conducted after the root canals were prepared with size 25 instruments. Pre‑ and postoperative cross‑section images of the roots (n=237,760) were then screened to identify the lengths of the microcracks. The results indicated that the microcrack lengths were notably increased following root canal preparation (P<0.05). The alterations in microcrack length in the OS group were more significant compared with those in the WO, RE and control groups (P<0.05). In conclusion, the formation and development of dentinal microcracks may be associated with the movement caused by preparation rather than the taper of the files. Among the single‑file Ni‑Ti systems, WO and RE were not observed to cause notable microcracks, while the OS system resulted in evident microcracks.

View Figures

View References

1	Arslan H, Barutcigil C, Karatas E, Topcuoglu HS, Yeter KY, Ersoy I and Ayrancı LB: Effect of citric acid irrigation on the fracture resistance of endodontically treated roots. Eur J Dent. 8:74–78. 2014. View Article : Google Scholar : PubMed/NCBI
2	Ertas H, Sagsen B, Arslan H, Er O and Ertas ET: Effects of physical and morphological properties of roots on fracture resistance. Eur J Dent. 8:261–264. 2014. View Article : Google Scholar : PubMed/NCBI
3	Bier CA, Shemesh H, Tanomaru-Filho M, Wesselink PR and Wu M: The ability of different nickel-titanium rotary instruments to induce dentinal damage during canal preparation. J Endod. 35:236–238. 2009. View Article : Google Scholar : PubMed/NCBI
4	Shemesh H, van Soest G, Wu M and Wesselink PR: Diagnosis of vertical root fractures with optical coherence tomography. J Endod. 34:739–742. 2008. View Article : Google Scholar : PubMed/NCBI
5	Kishen A: Mechanisms and risk factors for fracture predilection in endodontically treated teeth. Endodont Top. 13:57–83. 2006. View Article : Google Scholar
6	Kubo M, Miura J, Sakata T, Nishi R and Takeshige F: Structural modifications of dentinal microcracks with human aging. Microscopy (Oxf). 62:555–561. 2013. View Article : Google Scholar : PubMed/NCBI
7	Er K, Tasdemir T, Siso SH, Celik D and Cora S: Fracture resistance of retreated roots using different retreatment systems. Eur J Dent. 5:387–392. 2011.PubMed/NCBI
8	Saber SE, Nagy MM and Schäfer E: Comparative evaluation of the shaping ability of ProTaper Next, iRaCe and Hyflex CM rotary NiTi files in severely curved root canals. Int Endod J. 48:131–136. 2015. View Article : Google Scholar : PubMed/NCBI
9	Pop I, Manoharan A, Zanini F, Tromba G, Patel S and Foschi F: Synchrotron light-based µCT to analyse the presence of dentinal microcracks post-rotary and reciprocating NiTi instrumentation. Clin Oral Investig. 19:11–16. 2015. View Article : Google Scholar : PubMed/NCBI
10	Sathorn C, Palamara JE and Messer HH: A comparison of the effects of two canal preparation techniques on root fracture susceptibility and fracture pattern. J Endod. 31:283–287. 2005. View Article : Google Scholar : PubMed/NCBI
11	Yoldas O, Yilmaz S, Atakan G, Kuden C and Kasan Z: Dentinal microcrack formation during root canal preparations by different NiTi rotary instruments and the self-adjusting file. J Endod. 38:232–235. 2012. View Article : Google Scholar : PubMed/NCBI
12	Bürklein S, Tsotsis P and Schäfer E: Incidence of dentinal defects after root canal preparation: Reciprocating versus rotary instrumentation. J Endod. 39:501–504. 2013. View Article : Google Scholar : PubMed/NCBI
13	Liu R, Hou BX, Wesselink PR, Wu MK and Shemesh H: The incidence of root microcracks caused by 3 different single-file systems versus the ProTaper system. J Endod. 39:1054–1056. 2013. View Article : Google Scholar : PubMed/NCBI
14	Topçuoğlu HS, Düzgün S, Kesim B and Tuncay O: Incidence of apical crack initiation and propagation during the removal of root canal filling material with ProTaper and Mtwo rotary nickel-titanium retreatment instruments and hand files. J Endod. 40:1009–1012. 2014. View Article : Google Scholar : PubMed/NCBI
15	Ashwinkumar V, Krithikadatta J, Surendran S and Velmurugan N: Effect of reciprocating file motion on microcrack formation in root canals: An SEM study. Int Endod J. 47:622–627. 2014. View Article : Google Scholar : PubMed/NCBI
16	Arias A, Lee YH, Peters CI, Gluskin AH and Peters OA: Comparison of 2 canal preparation techniques in the induction of microcracks: A pilot study with cadaver mandibles. J Endod. 40:982–985. 2014. View Article : Google Scholar : PubMed/NCBI
17	Wright HM Jr, Loushine RJ, Weller RN, Kimbrough WF, Waller J and Pashley DH: Identification of resected root-end dentinal cracks: A comparative study of transillumination and dyes. J Endod. 30:712–715. 2004. View Article : Google Scholar : PubMed/NCBI
18	Matsushita-Tokugawa M, Miura J, Iwami Y, Sakagami T, Izumi Y, Mori N, Hayashi M, Imazato S, Takeshige F and Ebisu S: Detection of dentinal microcracks using infrared thermography. J Endod. 39:88–91. 2013. View Article : Google Scholar : PubMed/NCBI
19	De-Deus G, Silva EJ, Marins J, Souza E, Ade A Neves, Gonçalves Belladonna F, Alves H, Lopes RT and Versiani MA: Lack of causal relationship between dentinal microcracks and root canal preparation with reciprocation systems. J Endod. 40:1447–1450. 2014. View Article : Google Scholar : PubMed/NCBI
20	Beling KL, Marshall JG, Morgan LA and Baumgartner JC: Evaluation of cracks associated with ultrasonic root-end preparation of gutta-percha filled canals. J Endod. 23:323–326. 1997. View Article : Google Scholar : PubMed/NCBI
21	Yared G: Canal preparation using only one Ni-Ti rotary instrument: Preliminary observations. Int Endod J. 41:339–344. 2008. View Article : Google Scholar : PubMed/NCBI
22	Pérez-Higueras JJ, Arias A and de la Macorra JC: Cyclic fatigue resistance of K3, K3XF, and twisted file nickel-titanium files under continuous rotation or reciprocating motion. J Endod. 39:1585–1588. 2013. View Article : Google Scholar : PubMed/NCBI
23	Kiefner P, Ban M and De-Deus G: Is the reciprocating movement per se able to improve the cyclic fatigue resistance of instruments? Int Endod J. 47:430–436. 2014. View Article : Google Scholar : PubMed/NCBI
24	Nabeshima CK, Caballero-Flores H, Cai S, Aranguren J, Britto ML Borges and Machado ME: Bacterial removal promoted by 2 single-file systems: Wave one and one shape. J Endod. 40:1995–1998. 2014. View Article : Google Scholar : PubMed/NCBI
25	Bürklein S, Hinschitza K, Dammaschke T and Schäfer E: Shaping ability and cleaning effectiveness of two single-file systems in severely curved root canals of extracted teeth: Reciproc and WaveOne versus Mtwo and ProTaper. Int Endod J. 45:449–461. 2012. View Article : Google Scholar : PubMed/NCBI
26	Shemesh H, Bier C, Wu M, Tanomaru-Filho M and Wesselink PR: The effects of canal preparation and filling on the incidence of dentinal defects. 42:1–213. 2009.
27	Shemesh H, Roeleveld AC, Wesselink PR and Wu MK: Damage to root dentin during retreatment procedures. J Endod. 37:63–66. 2011. View Article : Google Scholar : PubMed/NCBI
28	Moeller L, Wenzel A, Wegge-Larsen AM, Ding M and Kirkevang LL: Quality of root fillings performed with two root filling techniques. An in vitro study using micro-CT. Acta Odontol Scand. 71:689–696. 2013. View Article : Google Scholar : PubMed/NCBI
29	Liu R, Kaiwar A, Shemesh H, Wesselink PR, Hou B and Wu M: Incidence of apical root cracks and apical dentinal detachments after canal preparation with hand and rotary files at different instrumentation lengths. J Endod. 39:129–132. 2013. View Article : Google Scholar : PubMed/NCBI
30	Kim HC, Lee MH, Yum J, Versluis A, Lee CJ and Kim BM: Potential relationship between design of nickel-titanium rotary instruments and vertical root fracture. J Endod. 36:1195–1199. 2010. View Article : Google Scholar : PubMed/NCBI