To quantify the discolouration of temporary acetal resins in vivo, based on weeks follow-up and salivary pH three thirds tooth. find out if final CIELAB coordinates can be predicted from initial colour coordinates, pH, situation (in thirds) follow-up. Colour (L, C, h) were recorded by spectrophotometry 13 participants fitted with hybrid provisional complete dentures made resin. recordings day p...

It is well known that the peripheral visual system declines with age: the yellowing of the lens causes a selective reduction of short-wavelength light and sensitivity losses occur in the cone receptor mechanisms. At the same time, our subjective experience of colour does not change with age. The main purpose of this large-scale study (n = 185) covering a wide age range of colour-normal observer...

The oxidation of aqueous solutions carbamazepine is conducted using the Fenton reagent, combined with photolytic action a 150 W medium pressure UV lamp, operating at T = 40 °C. effect acidity analysed an interval pH 2.0–5.0, verifying that 5.0 promotes colour formation (Colour 0.15 AU). iron studied, finding water increases in linear way, Colour 0.05 + 0.0075 [Fe]0. oxidising hydrogen peroxide ...