title: Influence of Surface Treatments and Adhesive Systems on Lithium Disilicate Microshear Bond Strength.
abstract: The purpose of this study was to evaluate the microshear bond strength of ceramic prosthetic structures reinforced by lithium disilicate cemented with resin cement under conditions of different surface treatments and adhesive systems. Seventy-two rectangular blocks of lithium disilicate (6.5 mm long × 5 mm wide × 1 mm thick) were fabricated, air abraded with 50-μm Al2O3 particles and divided into six groups (n=12) depending on the surface pretreatments. The groups were as follows: 10HF/S/SBM: 10% hydrofluoric acid etched for 20 s (10HF) + silane (S) + Adper Scotchbond Multi-Purpose (SBM); 10HF/S/SB: 10HF + S + Single Bond Universal (SB); 10HF/SBM; 10HF/SB; S/SBM and S/SB. Two 1-mm-long plastic tubes were placed on the specimens, filled with RelyX ARC resin cement and cured for 20 s per tube. The plastic tube was removed, and the microshear bond strength was tested. Data were submitted to analysis of variance and Tukey's tests (α=0.05). Fractured specimens were observed under optical microscopy. For both adhesives, the bond strengths (MPa) of groups treated with acid-etching and silane (10HF/S/SB: 24.82, 10HF/S/SBM: 24.90) were higher (p<0.001) than those of groups treated with acid-etching (10HF/SB: 16.47, 10HF/SBM: 19.94) only or only silane (S/SB: 18.42, S/SBM: 13.24). All groups showed a predominance of failure adhesive. The silanization should be a clinical step in cementing ceramic structures reinforced by lithium disilicate, even with the application of universal adhesive that contains silane in its formulation.
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, UNOPAR - Universidade Norte do Paraná, Londrina, PR, Brazil.
authors.forename: Celso Sebastião
authors.initials: CS
authors.lastname: Garboza
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, UNOPAR - Universidade Norte do Paraná, Londrina, PR, Brazil.
authors.forename: Sandrine Bittencourt
authors.initials: SB
authors.lastname: Berger
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, UNOPAR - Universidade Norte do Paraná, Londrina, PR, Brazil.
authors.forename: Ricardo Danil
authors.initials: RD
authors.lastname: Guiraldo
authors.affiliation: Department of Restorative Dentistry, Piracicaba Dental School, UNICAMP - Universidade Estadual de Campinas, Piracicaba, SP, Brazil.
authors.forename: Ana Paula Piovezan
authors.initials: AP
authors.lastname: Fugolin
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, UNOPAR - Universidade Norte do Paraná, Londrina, PR, Brazil.
authors.forename: Alcides
authors.initials: A
authors.lastname: Gonini-Júnior
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, UNOPAR - Universidade Norte do Paraná, Londrina, PR, Brazil.
authors.forename: Sandra Kiss
authors.initials: SK
authors.lastname: Moura
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, UNOPAR - Universidade Norte do Paraná, Londrina, PR, Brazil.
authors.forename: Murilo Baena
authors.initials: MB
authors.lastname: Lopes
mesh_terms: D003776:Dental Porcelain / Q000737:chemistry*; D008422:Materials Testing; D013499:Surface Properties
chemical_list: C493120:lithia disilicate; D003776:Dental Porcelain