The purpose of this study was to evaluate the effects of the silane coupling agent amount on the flexural properties and hydrolytic durability on an experimental composite resin for understanding the optimum amount of silanation. A spherical filler was silanated with 7 different amounts of gamma-MPTS, 0, 0.17, 0.34, 0.66, 1.36, 2.72 and 5.45 mass%. Photopolymerized experimental composite resins...

The effects of steam sterilization and gamma-irradiation on chitosan and thermogelling chitosan-beta-glycerophosphate (GP) solutions containing polyol additives were investigated. The selected polyols were triethylene glycol, glycerol, sorbitol, glucose and poly(ethylene glycol) (PEG). They were incorporated to chitosan solutions prior to sterilization in a proportion ranging from 1 to 5% (w/v)...

Molecularly imprinted polymers (MIPs) were fabricated on glass slides with a "sandwich" technique giving ~20 µm thick films. Methanol/water as a solvent, and polyethyleneglycol and polyvinylacetate as solvent modifiers, were used to give a porous morphology, which was studied with scanning electron microscopy and gravimetric analysis. Various MIPs were synthesized through non-covalent imprintin...

INTRODUCTION Acrylates are widely used low-molecular-weight substances, initially introduced in industry in the 1930s and subsequently applied also in medicine and the home. One of their main features is the ability to undergo polymerization. The most commonly used acrylic compounds are cyanoacrylates, methacrylates, and acrylates. OBJECTIVE To confirm suspicion of occupational disease in a g...

The aim of this study was to formulate and evaluate an experimental adhesive resin with the addition of 1,3,5-triacryloylhexahydro-1,3,5-triazine at different concentrations. Experimental adhesive resins were obtained by mixing 50% wt bisphenol A glycol dimethacrylate (BisGMA), 25% wt triethylene glycol dimethacrylate (TEGDMA), 25% wt 2-hydroxyethyl methacrylate (HEMA) and photoinitiator system...

INTRODUCTION Incomplete cross-linking of composite dental materials leads to their susceptibility to degradation in the environment of non-organic and organic solvents, contributing to the release of chemical compounds which are potentially harmful to living organisms. OBJECTIVE The aim of the study was an evaluation in in vitro conditions of releasing of potentially toxic substances from six...

This reaction is equilibrium-limited to 95 to 97% conversion in 2 to 4 stages because the temperature must be kept above the dewpoint of sulfur. Additional processing must be provided to reduce the concentration of sulfurous compounds in the effluent to environmentally acceptable levels. When the reaction between H2S and SO2 is carried out in organic liquids at temperatures below 15OoC it is ir...

The cytotoxic potential of ammonium-based deep eutectic solvents (DESs) with four hydrogen bond donors, namely glycerine (Gl), ethylene glycol (EG), triethylene glycol (TEG) and urea (U) were investigated. The toxicity of DESs was examined using In Vitro cell lines and In Vivo animal model. IC50 and selectivity index were determined for the DESs, their individual components and their combinatio...

We report the full characterization of a photocurable dimethacrylate-based formulation modified with small amounts (1 and 3 wt%) polystyrene-block-poly(ethylene oxide) (PS-b-PEO) block copolymer (BCP). The UV curable is mixture bisphenol A bis(2-hydroxy-3-methacryloxypropyl)ether (Bis-GMA) triethylene glycol dimethacrylate (TEGDMA) contains phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (Irga...