Impact of cooling on shaping ability of thermally treated files in canal models with double curvature

Author:

Jamleh Ahmed12,Albanyan Hajar12,Alaqla Ali12,Alissa Hamad12,Alshetan Nawaf3,Alraffa Sulaiman3,Alfadley Abdulmohsen12

Affiliation:

1. Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia

2. King Abdullah International Medical Research Center, Riyadh, Saudi Arabia

3. Dr. Sulaiman Al-Habib Medical Group, Riyadh, Saudi Arabia

Abstract

Background This study compared the ability of thermally treated files in shaping simulated canals with double curvature. Fifty-six canals were enlarged to a final size of 25 with ProTaper Next (PTN) or ZenFlex (ZF). Materials Half of the samples were shaped with cooled files (n = 14 each). The amount of removed resin was measured and canal deviation was determined at eight levels. Shaping time and maximum shaping torque values were also recorded. Data were statistically analyzed using analysis of variance and LSD, Kruskal–Wallis, and chi-square tests at a 0.05 significance level. Results Compared to PTN and cooled PTN, ZF and cooled ZF required lesser time to shape the canals. The maximum torques were found comparable between the groups. All the groups generated negligible deviations at every canal level evaluated and maintained the canal geometry. Although not significant, the cooled PTN and ZF files exhibited lesser canal deviations than their counterparts. Conclusion All groups demonstrated similar shaping ability whilst maintaining the original curvature of the canal in simulated canals with double curvature. However, ZF groups were able to shape the canals faster than PTN groups. There was a trend that cooled files made lesser canal deviations compared to their counterparts.

Funder

King Abdullah International Medical Research Center

Publisher

PeerJ

Subject

General Agricultural and Biological Sciences,General Biochemistry, Genetics and Molecular Biology,General Medicine,General Neuroscience

Reference41 articles.

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3. Effects of sodium hypochlorite concentration and temperature on the cyclic fatigue resistance of heat-treated nickel-titanium rotary instruments;Alfawaz;Journal of Endodontics,2018

4. Comparison of the shaping ability of various nickel-titanium file systems in simulated curved canals;Alrahabi;Saudi Endodontic Journal,2017

5. Shaping ability of ProTaper next and navigator EVO rotary nickel–titanium file systems in simulated L-shaped and S-shaped root canals;Alshahrani;Saudi Endodontic Journal,2019

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