Please cite this article in press as: J.P.M. Tribst, A.M.d.O. Dal Piva, A.L.S. Borges et al.. Effect of different materials and undercut on the removal force and stress distribution in circumferential clasps during direct retainer action in removable partial dentures. Dent Mater (2019), https://doi.org/10.1016/j.dental.2019.11.022 ARTICLE IN PRESS DENTAL-3470; No. of Pages 8 d e n t a l m a t e r i a l s x x x ( 2 0 1 9 ) xxx–xxx Available online at www.sciencedirect.com ScienceDirect jo ur nal home p ag e: www.intl.elsevierhealth.com/journals/dema Effect of different materials and undercut on the removal force and stress distribution in circumferential clasps during direct retainer action in removable partial dentures João Paulo Mendes Tribst a,b , Amanda Maria de Oliveira Dal Piva a,b,* , Alexandre Luiz Souto Borges a , Rodrigo Máximo Araújo a , João Maurício Ferraz da Silva a , Marco Antonio Bottino a , Cornelis Johannes Kleverlaan b , Niek de Jager b a PhD Graduate Program in Restorative Dentistry, São Paulo State University (Unesp), Institute of Science and Technology, Av. Eng. Francisco José Longo, n o 777. Jardim São Dimas, 12245-000, São José dos Campos, SP, Brazil b Department of Dental Materials Science, Academic Center for Dentistry Amsterdam (ACTA), Universiteit van Amsterdam and Vrije Universiteit, Gustav Mahlerlaan #3004, 1081 LA, Amsterdam, Noord-Holland, The Netherlands a r t i c l e i n f o Article history: Available online xxx Keywords: Removable partial denture Finite element analysis Prosthetic dentistry Retentive force Clasp Non-Metal clasp Retention a b s t r a c t Objectives. This study aimed to evaluate the effect of different materials and undercut on the removal force and stress distribution in the supporting tooth and in the circumferential clasp used in removable partial prosthesis. Methods. Upper molars prepared for Akers circumferential clasp with retention and opposing arm were modeled, scanned, elaborated with CAD software and the geometries imported in FEA and analyzed. Six different materials were selected for the clasp (Polyamide, Poly- oxymethylene, Polyetheretherketone - PEEK, Gold alloy, Titanium and CoCr) and 3 different undercuts (0.25, 0.50 and 0.75 mm), totaling 18 groups. Results. The clasps presented greater stress in their structure and potentially greater damage to the dental enamel when made with rigid materials and with more undercut; however, they presented greater ability to remain in position. Significance. Polyamide with a higher undercut is an esthetic alternative to rigid metallic clasps. It showed promising behavior because it strongly reduces the damage to the enamel, and even with an undercut of 0.75, the retention is lower than for CoCr with a 0.25 undercut, and this retention might still be sufficient. Polyoxymethylene and Polyetheretherketone (PEEK) are not suitable materials for the clasps, because the maximum stress occurring during removal with higher undercuts is higher than the material strength. © 2019 Published by Elsevier Inc. on behalf of The Academy of Dental Materials. ∗ Corresponding author at: Av. Eng. Francisco José Longo, n o 777. Jardim São Dimas, 12245-000, São José dos Campos, SP, Brazil E-mail addresses: joao.tribst@unesp.br (J.P.M. Tribst), amanda.piva@unesp.br (A.M.d.O. Dal Piva), alexandre.borges@unesp.br (A.L.S. Borges), maximo.araujo@unesp.br (R.M. Araújo), joao.mauricio@unesp.br (J.M.F. da Silva), mmbottino@uol.com.br (M.A. Bottino), c.kleverlaan@acta.nl (C.J. Kleverlaan), n.d.jager@acta.nl (N. de Jager). https://doi.org/10.1016/j.dental.2019.11.022 0109-5641/© 2019 Published by Elsevier Inc. on behalf of The Academy of Dental Materials.