Berrong, J M Effect of glass-ionomer base on composite resin hardness. [electronic resource] - Dental materials : official publication of the Academy of Dental Materials Jan 1989 - 38-40 p. digital Publication Type: Journal Article ISSN: 0109-5641 Standard No.: 10.1016/0109-5641(89)90091-2 doi Subjects--Topical Terms: Composite ResinsDental CementsGlass Ionomer CementsHardness