title: An in vitro study of marginal leakage associated with composite restorations using an acidified agar technique.
abstract: The marginal leakage associated with a composite restorative material was examined using an in vitro method for the production of secondary caries-like lesions after the restorations had been subjected to thermal cycling. The fillings were placed in cavities with a 90 degrees cavo-surface angle with and without etching of the walls with phosphoric acid and in cavities with a bevelled margin which were also acid etched. Some degree of leakage was demonstrated in 95% of the unetched cavities while approximately half of the restorations in etched unbevelled cavities showed leakage. With the bevelled and etched group virtually no leakage occurred.
mesh_terms: D000143:Acids; D003188:Composite Resins; D001840:Dental Bonding; D003731:Dental Caries / Q000209:etiology* / Q000473:pathology; D003737:Dental Cavity Preparation; D003743:Dental Enamel / Q000473:pathology; D003793:Dental Restoration, Permanent; D005782:Gels; D006801:Humans; D013499:Surface Properties; D013696:Temperature
chemical_list: D000143:Acids; D003188:Composite Resins; D005782:Gels