Accepted Article 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 an 'Accepted Article', doi: 10.1111/iej.12380 This article is protected by copyright. All rights reserved. Received Date : 30-Jun-2014 Revised Date : 14-Sep-2014 Accepted Date : 17-Sep-2014 Article type : Original Scientific Article Micro-CT Evaluation of C-Shaped Mandibular First Premolars in a Brazilian Subpopulation R. Ordinola-Zapata 1 , C. Monteiro Bramante 1 , P. Gagliardi Minotti 1 , B. Cavalini Cavenago 1 , J. L. Gutmann 3 , B. I. Moldauer 4 , M. A. Versiani 2 , M.A. Hungaro Duarte 1 1 Department of Endodontics, Bauru Dental School, University of São Paulo, Bauru, Brazil, 2 Department of Endodontics, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, Brazil, 3 Department of Endodontics, Baylor College of Dentistry, Texas A&M University System Health Science Center, Dallas, TX, USA, 4 Advanced Education in General Dentistry Program, Larkin Community Hospital, Florida, USA. Running title: C-shaped anatomy in mandibular first premolars Keywords: dental anatomy; mandibular premolars; C-shaped canal system; micro-computed tomography Corresponding author: Dr Ronald Ordinola-Zapata Faculdade de Odontologia de Bauru – USP, Al. Octávio Pinheiro Brisolla, 9-75 , CEP 17012-901, Bauru - São Paulo, Brazil e-mail: ronaldordinola@usp.br