In Sweden as well as in many other countries most materials currently used for dental restorations contain acrylate and methacrylate monomers (1). As a consequence of increased use of resin-based compounds, there has been an increase in reported cases of irritant and allergic contact dermatitis mainly among dental professionals (2-5). The most common agent causing dermatitis among dental profes...

In this study, firstly, (2-oxo-2-(3,4,5-trifluoroanilino)-ethyl-2-methylprop-2-enoate) FAOEME, a methacrylate monomer with arylamide side group containing three fluorine atoms in the branch, was synthesized. Poly(HEMA-co-FAOEME) obtained due to radical copolymerization of FAOEME 2-hydroxyethyl (HEMA). Structural characterization its copolymer and HEMA performed by spectroscopy methods such as F...

Insight in the osmotic behavior of degrading hydrogels is of great importance in the design of biodegradable hydrogels for biomedical applications. This study compares the degradation behavior of PEG-HEMA (hydroxyethylmethacrylated polyethylene glycol) and dex-HEMA (hydroxyethylmethacrylated dextran) hydrogels. The degradation of PEG-HEMA gels takes several months to over a year, while that of ...

Background: Polymeric materials are widely known as versatile materials, particularly for biomedical applications. The bioavailability, low toxicity, solubility, and permeability of this material play an essential role in implants, such joint replacements, bone plates, ligaments, vascular grafts, intraocular lenses, heart valves, sutures, dental implants. These can be formed either biodegradabl...

PURPOSE A four-month extended wear clinical trial was conducted to compare the ocular effects of a high Dk Balafilcon A silicone hydrogel lens and a low Dk HEMA 38.6 per cent H20 soft lens. METHOD Twenty-four subjects who were adapted to daily wear of soft lenses wore a high Dk lens in one eye and a low Dk HEMA lens in the other eye for four months on an extended wear basis after one week of ...

Because Methacrylic monomers are used in dental work, dental personnel, technicians, and patients are at risk of being sensitized. 2-hydroxyethyl methacrylate (2-HEMA) and ethyleneglycol dimethacrylate (EGDMA) are commonly used. Allergic test reactions to them sometimes appear beyond D7. This study was designed to study the development and course of positive test reactions to 2-HEMA and EGDMA i...

In Salmonella typhimurium and Escherichia coli, the hemA gene encodes the enzyme glutamyl-tRNA reductase, which catalyzes the first committed step in heme biosynthesis. We report that when heme limitation is imposed on cultures of S. typhimurium, glutamyl-tRNA reductase (HemA) enzyme activity is increased 10- to 25-fold. Heme limitation was achieved by a complete starvation for heme in hemB, he...

Polyhydroxyethylmethacrylate polymers (poly-HEMA) form hydrogels that provide an excellent alternative to agar in the production of salt bridges for use in bioelectrochemical experiments. A method for the simple production of poly-HEMA salt bridges is described. The poly-HEMA bridges were compared with agar bridges of similar geometry. Whereas poly-HEMA salt bridges have a conductivity that is ...

The Escherichia coli hemA gene, essential for the synthesis of 5-aminolevulinic acid (ALA), was isolated and sequenced. The following criteria identified the cloned gene as hemA. (i) The gene complemented a hemA mutation of E. coli. (ii) The gene was localized to approximately 26.7 min on the E. coli chromosomal linkage map, consistent with the location of the mapped hemA locus. Furthermore, DN...

The water-soluble HEMA has polar properties with small dimension to enhance the wetting properties of the adhesive solution and the penetration efficacy of the adhesive into demineralized dentin [3]. HEMA has been reported to be positively influence bond strength to dentin. Because of its hydrophilic character, it is also frequently added to improve miscibility of hydrophobic and hydrophilic co...