As frequently added to adhesives, the mono-functional monomer 2-hydroxyethyl methacrylate (HEMA) acts as co-solvent and improves surface wetting. Nevertheless, HEMA promotes watersorption hydrolysis at adhesive interfaces, affecting bond durability dentin. This study investigated if two acrylamide co-monomer alternatives could replace in experimental adhesive-resin formulations part of 3/2-step...

OBJECTIVES The aim of this study was to evaluate the water absorption and the amount of hydroxyethyl metacrylate (HEMA) level released from various resin modified glass ionomer cements. METHODS Advance, Vitremer and Protec-Cem resin modified glass ionomer cements were used to evaluate the HEMA release. Ten specimens were fabricated from each cement in 10 x 1 mm height. Thirty specimens were i...

objective: the use of hema as a biocompatible material in dentin bonding systems and its potential for clinical applications has been well established. excess water can affect conversion of bonding resins. the aim of this study was to survey the effect of water on the degree of conversion of hema by fourier transform infra-red spectroscopy (ft-ir). materials and methods: in this experimental st...

A series of polymers and copolymers of 2-hydroxyethyl methacrylate (HEMA) and methyl methacrylate (MMA) were synthesized in order to find surfaces that would adsorb minimal amounts of protein. The adsorption of albumin, lysozyme and immunoglobulin G from a three-way mixture of these proteins in isotonic buffered saline to the polymers was measured using 125I-labeled proteins. Apparently high pr...

OBJECTIVE The aim of this study was to evaluate the 5 year clinical dentin bonding effectiveness of two HEMA-free adhesives in Class V non-carious cervical lesions. MATERIAL AND METHODS A total of 169 Class V restorations were placed in 67 patients with a self-etching adhesive (G-Bond; 67), a 3-step HEMA and TEGDMA free etch-and-rinse (cfm; 51) and a control HEMA-containing etch-and-rinse adh...

In many bacteria, including the enteric species Salmonella typhimurium and Escherichia coli, heme is synthesized starting from glutamate by a pathway in which the first committed step is catalyzed by the hemA gene product, glutamyl-tRNA reductase (HemA). We have demonstrated previously that when heme limitation is imposed on cultures of S. typhimurium, HemA enzyme activity is increased 10- to 2...

Room-temperature vulcanizing silicone and homopolymers of 2-hydroxyethyl methacrylate (HEMA) have been used to permanently inflate detachable balloons [1] . HEMA is preferred over silicone because it is less viscous and is water soluble. Goto et al. [2] described a commercially available (HEMA A, lnterventional Therapeutics, S. San Francisco, CA) polymerizing substance that includes HEMA as the...

In this study, the DNA sorption performance of diatomite-Zn(II) embedded supermacroporous monolithic p(HEMA) cryogels were investigated for the purpose of designing a novel adsorbent that can be utilized for DNA purification, separation and immunoadsorption studies such as removal of anti-dsDNA antibodies from systemic lupus erythematosus (SLE) patient plasma. Poly(2-hydroxyethyl methacrylate) ...

Medical titanium alloy Ti-6Al-4V (TC4) has been widely used in the medical field, especially human tissue repair. However, TC4 some shortcomings, which may cause problems with biocompatibility and mechanical compatibility direct contact body. To solve this problem, physical gels are formed on surface of TC4, storage modulus gel matches that soft tissue. 2-bromoisobutyryl bromide (BIBB) dopamine...

for the purpose of increasing the permeability to oxygen and equilibrium water content in contact lenses, polar copolymers with nonionic monomers such as 2-hydroxyethle methacrylate(hema) is used. by adding the polar monomers to (hema), the permeability to oxygen and equilibrium with water content is increased and also the absorption of proteins on lens surface is changed. in this research, the...