INFLUENCE OF FILLER CHARGE ON GLOSS OF COMPOSITE MATERIALS BEFORE AND AFTER IN VITRO TOOTHBRUSHING
Available online 3 May 2013
this study evaluated the gloss behavior of experimental resin composites loaded with different filler percentages, immediately after polishing and after toothbrushing simulation.
sixteen disc-shaped specimens were fabricated for each different-charged composite (40%, 50%, 60%, 70% and 75%) and polished with SiC abrasive papers. Gloss measurements were made prior to simulated toothbrushing. The specimens were subjected to the simulation for 5, 15, 30 and 60 minutes using an electrical toothbrush with a standardized pressure while being immersed in a toothpaste/artificial saliva slurry.
Baseline composite gloss values ranged from 69.7 (40%) to 81.3 (75%) GU (gloss units) and from 18.1 (40%) to 32.3 (75%) GU after one hour of brushing. Highest gloss values were obtained by 75%-charged resin, while the lowest values were obtained by the 40%-charged one.
All tested materials showed a gloss decrease. However, the higher filler load a composite resin has, the higher gloss it can achieve.