On June 30, 2021, Chiari, Marina D. S.; Alania, Yvette; Bedran-Russo, Ana K.; Braga, Roberto R. published an article.Quality Control of Oxybis(ethane-2,1-diyl) bis(2-methylacrylate) The title of the article was Experimental dentin adhesives containing calcium orthophosphate particles: Effect on dentin bond strength, micro-permeability and collagen degradation. And the article contained the following:
To assess the effect of dicalcium phosphate dihydrate (DCPD) or mineral trioxide aggregate (MTA) particles on the microtensile bond strength (ΜTBS), micro-permeability and enzymic activity at the adhesive-dentin interface of exptl. dental adhesives. An exptl. ethanol-based, two-step etch-and-rinse adhesive system was prepared Four exptl. groups were tested, based on the type of particle added: (1) DCPD functionalized with diethylene glycol dimethacrylate (DCPD_DEGDMA), (2) citric acid (DCPD_CA), (3) calcium silicate (MTA) and (4) unfilled (control). All particles were added at 10 wt%. Human third molars had their occlusal enamel removed and dentin surface polished. After acid etching, the adhesives were applied on the dentin surfaces and the teeth were restored with a com. nanofilled resin composite. The μTBS and micro-permeability were tested after 24 h or 2 mo of storage in simulated body fluid (SBF) at 37°C. Bonded interfaces were observed using scanning electron microcopy (SEM). Gelatinolytic activity at the adhesive interfaces was assessed by in situ zymog. at 24 h and 2 mo in SBF/37°C. The results were described as relative florescent units (RFU). μTBS data were analyzed by ANOVA/Games-Howell test. Data from micro-permeability and in situ zymog. were analyzed by Kruskal-Wallis/Mann-Whitney test (alpha: 5%). Differences in μTBS were found among adhesives (control = MTA > DCPD_CA > DCPD_DEGDMA, p < 0.001), but not between storage times. The control group showed the lowest permeability at both observation periods. Except for DCPD_CA, no significant increases in micro-permeability were observed after 2 mo. All groups presented significant reductions in RFU values between 24 h and 2 mo. DCPD_DEGDMA (at 24 h) and MTA (at 2 mo) presented statistically lower RFU than the control (p < 0.01). Evidence of reduced MMP activity was observed at adhesive interfaces with the use of exptl. adhesives containing calcium-releasing particles. However, after two months, bond strength and micro-permeability results suggest that interfacial stability was not affected by adhesive formulation. The experimental process involved the reaction of Oxybis(ethane-2,1-diyl) bis(2-methylacrylate)(cas: 2358-84-1).Quality Control of Oxybis(ethane-2,1-diyl) bis(2-methylacrylate)
The Article related to calcium orthophosphate dentin adhesive bond strength micropermeability collagen degradation, Pharmaceuticals: Formulation and Compounding and other aspects.Quality Control of Oxybis(ethane-2,1-diyl) bis(2-methylacrylate)
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