Effect of partially demineralized dentin beneath the hybrid layer on dentin-adhesive interface micromechanics
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Data
2015-02-26
Autores
Anchieta, Rodolfo Bruniera [UNESP]
Machado, Lucas Silveira [UNESP]
Sundfeld, Renato Herman [UNESP]
Reis, Andre Figueiredo
Giannini, Marcelo
Luersen, Marco Antonio
Janal, Malvin
Rocha, Eduardo Passos [UNESP]
Coelho, Paulo G.
Título da Revista
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Título de Volume
Editor
Elsevier B.V.
Resumo
Objective: To investigate the presence of non-infiltrated, partially demineralized dentin (PDD) beneath the hybrid layer for self-etch adhesive systems, and its effect on micromechanical behavior of dentin-adhesive interfaces (DAIs). This in-vitro laboratory and computer simulation study hypothesized that the presence of non-infiltrated PDD beneath the hybrid layer does not influence the mechanical behavior of the DAI of self-etch adhesive systems.Methods: Fifteen sound third molars were restored with composite resin using three adhesive systems: Scotchbond Multipurpose (SBMP), Clearfil SE Bond (CSEB) and Adper Promp L-Pop (APLP). The thickness and length of all DAIs were assessed using scanning electron microscopy, and used to generate three-dimensional finite element models. Elastic moduli of the hybrid layer, adhesive layer, intertubular dentin, peritubular dentin and resin tags were acquired using a nano-indenter. Finite element software was used to determine the maximum principal stress. Mixed models analysis of variance was used to verify statistical differences (P < 0.05).Results: Elastic moduli and morphology were found to differ between the adhesive systems, as well as the presence and extension of PDD.Significance: Both self-etch adhesive systems (APLP and CSEB) had PDD. The DAI stress levels were higher for the one-step self-etch adhesive system (APLP) compared with the etch-and-rinse adhesive system (SBMP) and the self-etch primer system (CSEB). (C) 2014 Elsevier Ltd. All rights reserved.
Descrição
Palavras-chave
Dentin, Adhesive systems, Mechanical properties, Finite element, Adhesion, Nano-indentation, Hybrid layer
Como citar
Journal Of Biomechanics. Oxford: Elsevier Sci Ltd, v. 48, n. 4, p. 701-707, 2015.