Journal of oral rehabilitation vol:9 issue:3 pages:203-16
After cleaning with an abrasive toothpaste, fourteen polished composites were examined in vitro SEM and profilometrically. It was shown that the smooth surface composites kept a remarkable smoothness. The classic composites coarsened profilometrically eight times under these testing conditions, and the glass-ionomers fourteen times. SEM pictures pointed out that the organic matrix was the weakest link for classic composites as well as for glass-ionomer cements. The glass-ionomers were the roughest group because of the larger grain size, numerous cracks and porosities. The porosities hampered the roughness measurements in all materials and contributed to a large extent to the roughness of the products.