Journal
DENTAL MATERIALS
Volume 31, Issue 8, Pages 901-906Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dental.2015.04.018
Keywords
Polyacrylic acid; Dentin; Matrix metalloproteinase; Cysteine cathepsins; Degradation
Funding
- Academy of Finland [8126472]
- NIDCR [R01 DE015306]
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Objective. This study tested whether treatment of demineralized dentin with polyacrylic acid (PAA) has any activatory or inhibitory activity on dentin matrix metalloproteinases (MMP)s or cathepsin K (CAT-K). Methods. Dentin beams (1 mm x 2 mm x 6 mm; n=10) were completely demineralized with EDTA. After initial dry mass assessment, the beams were dipped into 37% phosphoric acid (PA), PA + 2% benzalkonium chloride (BAC), PA + 2% chlorhexidine digluconate (CHX), 10% PAA, PAA + BAC or PAA + CHX for 20s. Demineralized beams without treatment served as control. All beams were incubated in simulated body fluid (SBF) for 1 week and the dry mass loss was evaluated. Aliquots of SBF were used to analyze solubilized telopeptide fragments using ICTP as indicator of MMP-mediated collagen degradation and CTX for CAT-K-mediated degradation. Additional demineralized beams (n=10) were used to measure the influence of different chemical treatments on total MMP activity of EDTA-demineralized dentin using generic MMP assay. Data were analyzed by ANOVA (alpha = 0.05). Results. Dry mass loss ranged from 6% (PA) to 2% for (PA-BAC) or (PAA-BAC) (p < 0.05). ICTP release of PAA-treated group was significantly higher (p < 0.05) than the control, and not significantly different from the PA group (p > 0.05). PA + CHX or PAA + CHX and PAA + BAC showed significantly lower ICTP than PA or PAA groups (p < 0.05). CAT-K activity increased significantly after 10% PAA treatment compared to control (p < 0.05) or to PA postreatment. Significance. Demineralized dentin treated with 10% polyacrylic acid activated CAT-K more than 37% phosphoric acid; 2% chlorhexidine digluconate seems to be a better inhibitor of MMPs and CAT-K than 2% benzalkonium chloride. (C) 2015 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
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