title: The influence of various cavity bases on the micro-hardness of composites.
abstract: This study reports the effects of five commonly used bases on the hardness of three newer composite resins. The bases were a calcium hydroxide, a polycarboxylate, a ZOE, an EBA, and a glass ionomer cement. All bases except the calcium hydroxide caused reduction in the hardness of each composite, although for some base/composite combinations the reductions were not significant. Glass ionomer also caused considerable reduction in surface hardness and cannot be recommended for use as a base under composite resin restorations.
mesh_terms: D002126:Calcium Hydroxide; D003188:Composite Resins; D003738:Dental Cements; D003793:Dental Restoration, Permanent; D005069:Evaluation Studies as Topic; D005899:Glass Ionomer Cements; D006244:Hardness; D006801:Humans; D011076:Polycarboxylate Cement; D013499:Surface Properties; D015035:Zinc Oxide-Eugenol Cement
chemical_list: D003188:Composite Resins; D003738:Dental Cements; D005899:Glass Ionomer Cements; D011076:Polycarboxylate Cement; D015035:Zinc Oxide-Eugenol Cement; D002126:Calcium Hydroxide