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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of long-term storage on nanomechanical and morphological properties of dentin-adhesive interfaces

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Author(s):
Anchieta, Rodolfo Bruniera [1, 2] ; Machado, Lucas Silveira [3, 2] ; Martini, Ana Paula [1] ; dos Santos, Paulo Henrique [1, 3] ; Giannini, Marcelo [4] ; Janal, Malvin [2] ; Tovar, Nick [2] ; Sundfeld, Renato Herman [3] ; Rocha, Eduardo Passos [1] ; Coelho, Paulo G. [2]
Total Authors: 10
Affiliation:
[1] Univ Estadual Paulista, UNESP, Aracatuba Dent Sch, Dept Dent Mat & Prosthodont, Aracatuba, SP - Brazil
[2] NYU, Dept Biomat & Biomimet, New York, NY 10010 - USA
[3] Univ Estadual Paulista, UNESP, Aracatuba Dent Sch, Dept Restorat Dent, Aracatuba, SP - Brazil
[4] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Restorat Dent, Piracicaba, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Dental Materials; v. 31, n. 2, p. 141-153, FEB 2015.
Web of Science Citations: 18
Abstract

Introduction. To evaluate the influence of storage time on the elastic modulus, micromorphology, nanoleakage, and micromechanical behavior of the dentin-adhesive interfaces of five adhesive systems (Scotchbond Multi-Purpose, Clearfil SE Bond, One Up Bond F, Adper Easy One, and Filtek LS Adhesive) after 24 h (T0) and 12 months (T1). Methods. Fifty teeth were restored and distributed according to each adhesive system (n = 10). At least four specimens were obtained from each tooth. One specimen was evaluated under SEM to obtain the micromorphology of dentin-adhesive interface (DAI). Two specimens were used to assess nanoleakage, one tested in T0 and the other in T1. The last specimen was used for nanoindentation, in T0 and T1, to obtain the initial and final mechanical properties of DAI structures. Two non-restored teeth were evaluated under SEM to obtain the dentin morphology. Laboratorial data were used to build 15 finite element models to assess the maximum principal stress in each time of analysis. Results. Storage resulted in hydrolysis of the dentin-adhesive interfaces for all groups. Silver impregnation increased for all groups after 1 year storage (p < .05), except for Clearfil SE Bond. In general, a decrease in elastic modulus values was observed for all groups from T0 to T1 (p < .05), mainly at the hybrid layer. The FEAs showed higher stress levels at T1 than T0 simulations for all adhesives. Conclusion. At T1, degradation occurred at the dentin-adhesive interface formed by all adhesives, and the intensity of degradation differed depending on the type of adhesive system used. The interface formed by the self-etching primer containing the 10-MDP functional monomer showed the highest stability among the adhesive systems after 12 months of storage. (C) 2014 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 12/07012-1 - Nanomechanical properties and micromechanical evaluation of dentin/adhesive interface after hydrolytic degradation: a nanoindentation and tridimensional finite element analyses
Grantee:Rodolfo Bruniera Anchieta
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 10/12926-7 - Nanomechanical properties and micromechanical evaluation of dentin/adhesive interface after hydrolytic degradation: nanoidentation and tridimensional finite element analyses
Grantee:Rodolfo Bruniera Anchieta
Support Opportunities: Scholarships in Brazil - Doctorate