title: Microleakage of glass ionomer/composite laminate Class V restorations.
abstract: The aim of this investigation was to evaluate the effects on microleakage of pretreating dentin with polyacrylic acid (PAA), prior to placing a glass ionomer base/composite laminate restoration. Class V erosion-type lesions with the incisal margin on enamel and the cervical margin below the cemento-enamel junction (CEJ), were prepared in 50 sound extracted teeth. These teeth were divided into five dentin treatment groups: A) 10% PAA; B) 20% PAA; C) and D) 40% PAA; E) no dentin preconditioning. In groups A, B, C and E, a glass ionomer base was placed within 1 mm of the margins. In group D the glass ionomer base extended to the cervical margin. The glass ionomer base and the incisal enamel were etched with 37% phosphoric acid prior to placing a bonding agent and restoring with a composite. The restorations were finished and polished and the teeth were stored in distilled water at 37 degrees C for 7 days. They were thermocycled in 0.5% fuchsin dye for 500 cycles (5 degrees C to 60 degrees C), embedded in epoxy resin, and sectioned at 250 mu intervals through the restorations. The section of each tooth exhibiting the most severe dye penetration along the tooth/restoration interface was evaluated and scored both incisally and cervically: 0 = no leakage; 1 = leakage up to the glass ionomer base; 2 = leakage up to 1/2 the wall length; 3 = leakage exceeding 1/2 the wall length. Cervically, the median leakage for all groups was 3.0. Incisally, the median leakage for all the groups was 0.0.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.forename: P
authors.initials: P
authors.lastname: McInnes
authors.forename: E
authors.initials: E
authors.lastname: Perkins
authors.forename: R
authors.initials: R
authors.lastname: Weinberg
mesh_terms: D000180:Acrylic Resins; D003188:Composite Resins; D003736:Dental Cavity Lining; D003738:Dental Cements; D003763:Dental Leakage / Q000517:prevention & control*; D003793:Dental Restoration, Permanent / Q000379:methods; D003804:Dentin / Q000187:drug effects*; D005899:Glass Ionomer Cements; D006801:Humans
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins; D003738:Dental Cements; D005899:Glass Ionomer Cements; C006903:carbopol 940