The silver sorption layer in dental composites; three year results

摘要

Objectives: the purpose of this investigation was o observe the behaviour of a recently discovered silver sorption layer in seven dental composities for three years. Methods: Rectangular block test pieces (3.0 × 2.5 × 2.5 mm) of seven resin composites were fabricated and the resin rich layer removed From one surface by grinding on silica carbide paper. The testpieces were immersed in aqueous AgNO_3 (3 mol/l). After 26, 42, 90, 180, 360, 540, 720 and 1085 days, respectively, nine specimens of each material were removed to measure the depth of silver stain in the different composites.