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. 2020 Jun 25;9(6):1989. doi: 10.3390/jcm9061989

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Box plot of the non-surgical endodontic retreatment working time (min) regarding the non-surgical endodontic retreatment techniques. PTR: ProTaper Retreatment endodontic rotary instruments; RCB50: Reciproc Blue endodontic reciprocating instrument; H-GG: combined root canal retreatment technique between Gates-Glidden drills and Hedstrom files.