OBTAINING AND RESEARCH OF SILICON-CONTAINING CARBAMIDE FORMALDEHYDE RESIN

dimethylhydantoin-formaldehyde resin and polyvinylpyrrolidone

Berlin, A. and Smeets, J. (1974). European intercomparison programmes and harmonization oftechniqueswith special reference to heavy metals in biological fluids. Presented at the Fourth Annual Symposium onRecent Advances in the Analytical Chemistry of Pollutants, Basle, Switzerland. Bryce-Smith, D. (1972). Behavioural effects of lead and other heavy metal pollutants. Chemistry in Britain, 8, 240...

Resorcinol-Formaldehyde (R-F) Resin

Effects of Carbamide Peroxide Bleaching Gel on Color of Silorane- and Methacrylate-based Resin Composites

Introdouction: Bleaching has become a common treatment for improving the appearance of natural teeth. However, the need to protect dental restorations from bleaching agent exposure is inevitable, as these agents may change the color of restorative materials by oxidation. Filtek P90 composite resin has recently been introduced with the aim of decreasing polymerization shrinkage. The purpose of...

Structure formation in urea-formaldehyde resin synthesis

The structure formation in acid promoted polycondensation and particularly in alkaline post-treatment with urea was studied by 13C NMR spectroscopy in the three-step synthesis of ureaformaldehyde resins. Trishydroxymethyl urea was identified as the constituent of the mixture of hydroxylmethylated urea derivatives obtained in alkaline conditions. The formation of methylenes linked to secondary o...

Resorcinol-formaldehyde resin "Russian Red" endodontic therapy.

Resorcinol-formaldehyde resin is a material used in endodontic therapy in many foreign countries. With immigration to the United States increasing, American dentists need to become familiar with resorcinol-formaldehyde therapy. It contains two potentially toxic components, formaldehyde (liquid) and resorcinol (powder). Zinc oxide or barium sulfate may be used for radiopacity. When 10% sodium hy...