Long-term nano-mechanical properties of biomodified dentin-resin interface components

Author(s)

Dos Santos, Paulo Henrique ^{[1, 2]} ; Karol, Sachin ^[1] ; Pedran-Russo, Ana Karina ^[1]

Affiliation

^[1] Univ Illinois, Coll Dent, Dept Restorat Dent, Chicago, IL 60612 - USA

^[2] UNESP, Aracatuba Sch Dent, Dept Dent Mat & Prosthodont, Aracatuba, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF BIOMECHANICS; v. 44, n. 9, p. 1691-1694, JUN 3 2011.
• Web of Science Citations: 27

Abstract

Failures of dental composite restorative procedures are largely attributed to the degradation of dentin-resin interface components. Biomodification of dentin using bioactive agents may improve the quality and durability of the dentin-resin bonds. The aim of this study was to nanomechanically assess the reduced modulus of elasticity (Er) and nano-hardness (H) of major components of the dentin-resin interface (hybrid layer, adhesive layer and underlying dentin) biomodified by collagen cross-linkers at 24 h, 3 and 6 months following restorative procedure. Demineralized dentin surfaces were biomodified with 5% glutaraldehyde (GD) or 6.5% grape seed extract (GSE) prior to placement of adhesive systems and composite resin. Nano-measurements of the interface components in a fluid cell showed that both agents increased the Er and H of underlying dentin after 3 and 6 months when compared to a control. The mechanical properties of the adhesive and hybrid layers decreased over time. Biomodification of the dentin-resin interface structures using GD and GSE can increase the mechanical properties of the interface over time and may contribute to the long-term quality of adhesive restorations. (C) 2011 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 08/03213-7 - Effect of colagen cross-linkers in the adhesive interfaces: evaluation of mechanical nanoproperties
• Grantee: Paulo Henrique dos Santos
• Support Opportunities: Scholarships abroad - New Frontiers