title: [Marginal gaps of combined composite and glass ionomer cement fillings in different preparations in vitro].
abstract: In 34 extracted molars with class V cavities (coronal margin in the enamel, apical margin in the dentin) a shoulder or a shoulder with bevel were prepared on the apical aspect. The dentin was covered with glass ionomer cement (GIC) and after beveling the neighboring enamel composite material was applied on top with enamel etching. 24 other cavities filled with either composite or glass ionomer cement served as controls. The specimen were exposed to 2000 alternating thermal tests (1 min. at 8 degrees C, 1 min at 60 degrees C) and alternations of the filling margins were recorded quantitatively using replicas in the SEM. After the alternating thermal tests GIC controls showed statistically significant better margin in enamel and dentin with shoulder preparations alone than the combined or pure composite fillings. Combined fillings with beveled apical cavity margins were superior to shoulder preparations alone. Glass ionomer cement seems to be better for the treatment of class V cavities in terms of margin tightness than composite alone or in combination.
authors.forename: E
authors.initials: E
authors.lastname: Reich
authors.forename: H
authors.initials: H
authors.lastname: Völkl
mesh_terms: D003188:Composite Resins; D003738:Dental Cements; D003793:Dental Restoration, Permanent; D003799:Dental Stress Analysis; D005899:Glass Ionomer Cements; D006801:Humans; D013499:Surface Properties
chemical_list: D003188:Composite Resins; D003738:Dental Cements; D005899:Glass Ionomer Cements
vernacular_title: Der Randspalt kombinierter Füllungen aus Komposit und Glasionomerzement in vitro.