Nanomechanical properties of biochemically modified dentin bonded interfaces

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Santos, Paulo Henrique dos [UNESP]
Karol, S.
Bedran-Russo, A. K. B.

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P>The effect of biomodification of dentin matrices using collagen cross-linkers, glutaraldehyde (GD) and grape seed extract (GSE), on the reduced modulus of elasticity (Er) and nanohardness (H) of the hybrid layer and underlying dentin was investigated at the dentin-resin bonded interface. The coronal dentin of nine molars were exposed and divided into groups: 5% GD, 6 center dot 5% GSE and control. Control samples were etched, bonded with Adper Single Bond Plus and Premise composite. GD and GSE were applied for 1 h prior to bonding procedures. After 24 h, samples were sectioned, and resin-dentin beams were either kept in distilled water or exposed to collagenase treatment for 24 h. Nano-indentations were performed at the hybrid layer and underlying dentin. GD and GSE treatment increased the Er and H of resin-dentin interface structures when compared to the control group (P < 0 center dot 05), particularly the hybrid layer, and may be a promising novel approach to strengthen the dentin-resin bonded interface structures when using these adhesive system and resin-based composite.



collagen, adhesion, mechanical properties, interfaces, dental materials

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Journal of Oral Rehabilitation. Hoboken: Wiley-blackwell, v. 38, n. 7, p. 541-546, 2011.