title: The influence of surface standardization of lithium disilicate glass ceramic on bond strength to a dual resin cement.
abstract: In vitro studies to assess bond strength between resins and ceramics have used surfaces that have been ground flat to ensure standardization; however, in patients, ceramic surfaces are irregular. The effect of a polished and unpolished ceramic on bond strength needs to be investigated. Sixty ceramic specimens (20×5×2 mm) were made and divided into two groups. One group was ground with 220- to 2000-grit wet silicon carbide paper and polished with 3-, 1-, and ¼-μm diamond paste; the other group was neither ground nor polished. Each group was divided into three subgroups: treated polished controls (PC) and untreated unpolished controls (UPC), polished (PE) and unpolished specimens (UPE) etched with hydrofluoric acid, and polished (PS) and unpolished specimens (UPS) sandblasted with alumina. Resin cement cylinders were built over each specimen. Shear bond strength was measured, and the fractured site was analyzed. Analysis of variance (ANOVA) and Tukey post hoc tests were performed. PE (44.47 ± 5.91 MPa) and UPE (39.70 ± 5.46 MPa) had the highest mean bond strength. PS (31.05 ± 8.81 MPa), UPC (29.11 ± 8.11 MPa), and UPS (26.41 ± 7.31 MPa) were statistically similar, and PC (24.96 ± 8.17 MPa) was the lowest. Hydrofluoric acid provides the highest bond strength regardless of whether the surface is polished or not.
authors.affiliation: School of Dentistry, Graduate Program, Pontiphical Catholic University of Paraná, Curitiba, Brazil. rafaeltbrum@yahoo.com.br
authors.forename: R
authors.initials: R
authors.lastname: Brum
authors.forename: R
authors.initials: R
authors.lastname: Mazur
authors.forename: J
authors.initials: J
authors.lastname: Almeida
authors.forename: G
authors.initials: G
authors.lastname: Borges
authors.forename: D
authors.initials: D
authors.lastname: Caldas
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000537:Aluminum Oxide / Q000737:chemistry; D017554:Carbon Compounds, Inorganic / Q000737:chemistry; D002516:Ceramics / Q000737:chemistry*; D055117:Curing Lights, Dental; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D045662:Dental Etching / Q000379:methods; D003775:Dental Polishing / Q000379:methods; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D018130:Diamond / Q000737:chemistry; D006801:Humans; D006858:Hydrofluoric Acid / Q000737:chemistry; D018020:Lithium Compounds / Q000737:chemistry; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D017655:Silicon Compounds / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D017554:Carbon Compounds, Inorganic; D003738:Dental Cements; C118557:Empress 2; D018020:Lithium Compounds; C076808:Monobond S; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; D017655:Silicon Compounds; C493120:lithia disilicate; D003776:Dental Porcelain; D018130:Diamond; C023506:Glass ceramics; D000537:Aluminum Oxide; D006858:Hydrofluoric Acid; C022088:silicon carbide