title: In vitro microleakage at the gingival margin of porcelain and resin veneers.
abstract: This in vitro study investigated the effect of dental surface treatments on the seal of porcelain and resin laminate veneers to tooth structure. Nine groups of 20 teeth were prepared for labial veneers--six groups with the apical margin of the veneer in dentin, two groups with the veneer wholly bordered by enamel, and one group with the apical margin coincident with the apical margin of a previously placed glass ionomer restoration. The teeth were treated with a variety of dentin-bonding agents prior to restoration of eight groups with porcelain veneers and one group with Visio-Gem microfilled resin veneers. After placement, the veneers were stored in water for 4 days, then subjected to thermocycling before silver staining and sectioning. Results showed no leakage around the margins of the veneers wholly bordered by enamel. Complete leakage was found around the glass ionomer restorations, and nearly total leakage was found along the resin-dentin interface of the resin veneers. The porcelain veneers that extended onto dentin showed variable but limited leakage for four of five of the dentin-bonding treatments.
authors.affiliation: Department of Restorative Dentistry, University of California, School of Dentistry, San Francisco.
authors.forename: A M
authors.initials: AM
authors.lastname: Lacy
authors.forename: C
authors.initials: C
authors.lastname: Wada
authors.forename: W
authors.initials: W
authors.lastname: Du
authors.forename: L
authors.initials: L
authors.lastname: Watanabe
mesh_terms: D000134:Acid Etching, Dental; D000180:Acrylic Resins / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003737:Dental Cavity Preparation; D003738:Dental Cements / Q000737:chemistry; D003743:Dental Enamel / Q000473:pathology; D003763:Dental Leakage / Q000473:pathology; D003776:Dental Porcelain / Q000737:chemistry*; D003801:Dental Veneers; D003804:Dentin / Q000473:pathology; D005881:Gingiva; D005899:Glass Ionomer Cements / Q000737:chemistry; D005976:Glutaral / Q000737:chemistry; D006801:Humans; D008298:Maleates / Q000737:chemistry; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D009566:Nitrates / Q000737:chemistry; D017942:Nitric Acid; D010070:Oxalates / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D019279:Resin Cements; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins; D003738:Dental Cements; D005899:Glass Ionomer Cements; D008298:Maleates; D008689:Methacrylates; C070605:Mirage-Bond; D009566:Nitrates; D010070:Oxalates; D011109:Polymethacrylic Acids; D019279:Resin Cements; C046981:ESPE Visio-Gem; C061140:Tenure Dentin Conditioner; D003776:Dental Porcelain; D017942:Nitric Acid; C040964:Ketac-Fil; C041330:Scotchbond; C044372:Gluma; D005976:Glutaral