Abstract
Since the denture base absords with use, various deodorant and cleansing preparations are on the market. This absorption of smell is caused by rotting of food residue, so that it may be prevented to some extent by providing a bactericidal property in the resin base. In this study, we examined whether acrylic resin could exhibit bactericidal activity by the oligodynamic action of silver. We evaluated changes in the color, water absorption, solubility and transvers deflection of the denture base resin by the addition of silver powder. Concerning the oligodynamic action, no inhibition zone was observed without the addition of silver powder, but inhibition zones of 0.8-2.4 mm, 1.3-3.3 mm, and 2.1-4.0 mm (4.2 mm with standerd silver) were observed with the addition of silver powder to resin powder at 5%, 10% and 20% respectively. Concerning color changes of the acrylic resin with the addition of silver, the color difference was greater at a higher silver content. The color difference was smaller in dark pink resin than in clear resin. The water absorption and solubility decreased with the increase in the percentage of silver. The transverse deflection also decreased with an increasing percentage of silver.
