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Type: Artigo de periódico
Title: MMP-2 assay within the hybrid layer created by a two-step etch-and-rinse adhesive: Biochemical and immunohistochemical analysis
Author: Mazzoni, A
Carrilho, M
Papa, V
Tjaderhane, L
Gobbi, P
Nucci, C
Di Lenarda, R
Mazzotti, G
Tay, FR
Pashley, DH
Breschi, L
Abstract: Objective: Degradation of hybrid layers (HLs) within resin-infiltrated dentine results from multiple degradation factors, including collagenolytic activity of specific matrix metalloproteinases (MMPs). Inhibition of host-derived MMPs may, therefore, slow the degradation of HL. The null hypothesis tested is that the presence of MMP-2 is similar regardless of chlorhexidine (CHX) pre-treatment or the use of an adhesive. Methods: Powdered dentine prepared from extracted human teeth was divided into 4 groups: (G1) mineralised powder (control group); (G2) dentine powder treated with 1% phosphoric acid for 1 min; (G3) 1% phosphoric acid-etched dentine treated with Adper Scotchbond 1 XT (SB1XT; 3M ESPE); (G4) 1% phosphoric acid-etched dentine treated with 0.2% CHX followed by SB1XT. The concentration of detectable pro-MMP-2 and MMP-2 was assayed using a colorimetric assay system (QuantiSir). In addition, the presence of MMP-2 in the HL was assessed in 1 year-aged adhesive-dentine interfaces using an immunohistochemical approach under FEI-SEM/TEM. Results: In dentine powder treated with 1% phosphoric acid (G2), MMP-2 level decreased compared to controls (G1); the application of SB1XT (G3) resulted in an increase of MMP-2, whilst 0.2% CHX before SB1XT application (G4), reduced MMP-2. The FEI-SEM/TEM analysis revealed MMP-2 distribution within the HL of aged interfaces showing increase MMP-2 patterns in the control group and minor labelling in the CHX-pretreated specimens. Conclusion: The results of this study support the use of non-toxic MMPs inhibitors, such as CHX, as an appropriate additional step in bonding procedures in order to increase the longevity of the adhesive restorations. (C) 2011 Elsevier Ltd. All rights reserved.
Subject: Dentine bonding agents
Country: Inglaterra
Editor: Elsevier Sci Ltd
Citation: Journal Of Dentistry. Elsevier Sci Ltd, v. 39, n. 7, n. 470, n. 477, 2011.
Rights: fechado
Identifier DOI: 10.1016/j.jdent.2011.04.004
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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