Biodegradation of resin –dentin interfaces is dependent on the restorative material, mode of adhesion, esterase or MMP inhibition

   Publication HistoryPublished online:May 19, 2018Accepted:May 8, 2018 Received in revised form:April 2, 2018 Received:August 22, 2017 AbstractObjectiveTo measure the effect of simulated human salivary esterases (SHSE) and metalloproteinases (MMP) inhibition on the integrity of restoration –tooth interfaces made from traditional or polyacid-modified resin composites bonded to human dentin by either total-etch or self-etch adhesives.MethodsResin –dentin specimens, made from traditional (Z250) or polyacid-modified (Dyract-eXtra) composites were bonded to human dentin using total-etch (TE-Scotchbond) or self-etch (SE-EasyBond) adhesives. TE was applied with or without the MMP inhibitor galardin. Specimens were incubated in phosphate-bu ffer or SHSE (37 °C/pH = 7.0) for up to 180 days, then suspended in a continuous flow biofilm fermenter cultivating biofilms ofStreptococcus mutans UA159. Interfacial bacterial penetration, biofilm biomass and viability were measured by confocal laser scanning microscopy and biomarker dyes and used as interfacial biodegradation markers.ResultsAll specimens showed increased biofilm penetration and biomass with time regardless of incubation condition. SHSE increased bacterial penetration in all experimental samples after 180  days (p <  0.05). Galardin reduced interfacial bacterial ingress and bacterial biomassvs. non-MMP-inhibited TE-bonded specimens (p  <  0.05). TE interfaces showed lower ...
Source: Dental Technology Blog - Category: Dentistry Source Type: news