title: Matrix metalloproteinase inhibitory properties of benzalkonium chloride stabilizes adhesive interfaces.
abstract: This study evaluated the effects of different concentrations of benzalkonium chloride (BAC) on the preservation of adhesive interfaces created with two etch-and-rinse adhesives and its inhibitory properties on dentin matrix metalloproteinase (MMP) activity. The following groups were tested with the adhesive systems Optibond Solo Plus and All-Bond 3: Group 1, adhesive without inhibitor (control); Group 2, topical 2.0% chlorhexidine (2.0% CHX); Group 3, phosphoric acid with 1.0%wt BAC (BAC-PA); Group 4, 0.25% BAC-adhesive (0.25% BAC); Group 5, 0.5% BAC-adhesive (0.5% BAC); Group 6, 1.0% BAC-adhesive (1.0% BAC); and Group 7, 2.0% BAC-adhesive (2.0% BAC). Composite cylinders were fabricated, and shear bond strength (SBS) was evaluated after 24 h, 6 months, and 18 months of storage. Extracts from concentrated demineralized human dentin powder were subjected to SDS-PAGE and incubated in the presence of 0.25, 0.5, 1.0, and 2.0% BAC. Overall, stable bonds were maintained for 18 months. Improved bond strengths were seen for 0.5% BAC and 1.0% BAC when bonding with Optibond Solo Plus, and for 0.25% BAC and 0.5% BAC when bonding with All-Bond 3. Zymographic analysis revealed complete inhibition of gelatinolytic activity with BAC. Benzalkonium chloride, at all concentrations, inhibited dentin proteolytic activity, which seems to have contributed to the improved bond stability after 18 months for specific combinations of BAC concentration and adhesive.
authors.affiliation: Department of Restorative Dentistry, School of Dental Medicine, University at Buffalo, Buffalo, NY, USA.
authors.forename: Camila
authors.initials: C
authors.lastname: Sabatini
authors.forename: Shaival K
authors.initials: SK
authors.lastname: Patel
mesh_terms: D001548:Benzalkonium Compounds / Q000494:pharmacology*; D003799:Dental Stress Analysis; D003804:Dentin / Q000187:drug effects*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D004591:Electrophoresis, Polyacrylamide Gel; D006801:Humans; D061965:Matrix Metalloproteinase Inhibitors / Q000494:pharmacology*; D011310:Preservatives, Pharmaceutical / Q000494:pharmacology*; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength
chemical_list: D001548:Benzalkonium Compounds; D017220:Dentin-Bonding Agents; D061965:Matrix Metalloproteinase Inhibitors; D011310:Preservatives, Pharmaceutical; D019279:Resin Cements
keywords: SDS-PAGE; bond strength; dental adhesive; dentin; matrix metalloproteinase