This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1111/IEJ.13247 This article is protected by copyright. All rights reserved DR. ALI KELES (Orcid ID : 0000-0003-2835-767X) DR. CANGUL KESKIN (Orcid ID : 0000-0001-8990-4847) DR. MARCO AURÉLIO VERSIANI (Orcid ID : 0000-0001-5277-9827) Article type : Original Scientific Article Evaluation of dentine thickness of middle mesial canals of mandibular molars prepared with rotary instruments: a micro-CT study A Keles 1 , C Keskin 1 , R Alqawasmi 1 , MA Versiani 2 1 Department of Endodontics, Faculty of Dentistry, Ondokuz Mayıs University Samsun, Turkey, 2 Dental Specialty Center, Brazilian Military Police, Minas Gerais, Brazil Running head: Dentine thickness of middle mesial canals Keywords: danger zone, dentine thickness, middle mesial canal, mandibular molar, mesial root, micro-CT Corresponding author Dr. Ali Keleş Department of Endodontics, Faculty of Dentistry, Ondokuz Mayıs University, 55400 Samsun, Turkey alikeles29@yahoo.com Accepted Article