title: Surface treatments for repair of feldspathic, leucite - and lithium disilicate-reinforced glass ceramics using composite resin.
abstract: The aim of this study was to evaluate the efficacy of different surface conditioning methods on the microtensile bond strength of a restorative composite repair in three types of dental ceramics: lithium disilicate-reinforced, leucite-reinforced and feldspathic. Twelve blocks were sintered for each type of ceramic (n=3) and stored for 3 months in distilled water at 37 °C. The bonding surface of ceramics was abraded with 600-grit SiC paper. Surface treatments for each ceramic were: GC (control) - none; GDB - diamond bur #30 µm; GHF - hydrofluoric acid (10%); GT- tribochemical silica coating (45-μm size particles). Treatments were followed by cleaning with phosphoric acid 37% for 20 s + silane + adhesive. The composite resin was used as restorative material. After repair, samples were subjected to thermocycled ageing (10,000 cycles between 5 °C and 55 °C for 30 s). Thereafter, the samples were sectioned into 1.0 mm2 sticks and tested for microtensile bond strength with 0.5 mm/min crosshead speed. Data were compared by two-way ANOVA and Tukey's test (α=0.05). The superficial wear with diamond bur proved to be suitable for feldspathic porcelain and for leucite-reinforced glass ceramic while hydrofluoric acid-etching is indicated for repairs in lithium disilicate-reinforced ceramic; tribochemical silica coating is applicable to leucite-reinforced ceramic. Predominance of adhesive failures was observed (>85% in all groups). In conclusion, the success of surface treatments depends on the type of ceramic to be repaired.
authors.affiliation: Department of Prosthodontics and Dental Materials, School of Dentistry, IMED - Meridional University, Passo Fundo, RS, Brazil.
authors.forename: Christian Alencar
authors.initials: CA
authors.lastname: Neis
authors.affiliation: Dentistry and Nursing, Department of Restorative Dentistry, School of Pharmacy, UFC - Federal University of Ceará, Fortaleza, CE, Brazil.
authors.forename: Nadine Luísa Guimarães
authors.initials: NL
authors.lastname: Albuquerque
authors.affiliation: Dentistry and Nursing, Department of Restorative Dentistry, School of Pharmacy, UFC - Federal University of Ceará, Fortaleza, CE, Brazil.
authors.forename: Ivo de Souza
authors.initials: Ide S
authors.lastname: Albuquerque
authors.affiliation: Department of Prosthodontics and Dental Materials, School of Dentistry, IMED - Meridional University, Passo Fundo, RS, Brazil.
authors.forename: Erica Alves
authors.initials: EA
authors.lastname: Gomes
authors.affiliation: Department of Prosthodontics and Dental Materials, School of Dentistry, IMED - Meridional University, Passo Fundo, RS, Brazil.
authors.forename: Celso Bernardo de
authors.initials: CB
authors.lastname: Souza-Filho
authors.affiliation: Dentistry and Nursing, Department of Restorative Dentistry, School of Pharmacy, UFC - Federal University of Ceará, Fortaleza, CE, Brazil.
authors.forename: Victor Pinheiro
authors.initials: VP
authors.lastname: Feitosa
authors.affiliation: Department of Prosthodontics and Dental Materials, School of Dentistry, IMED - Meridional University, Passo Fundo, RS, Brazil.
authors.forename: Aloisio Oro
authors.initials: AO
authors.lastname: Spazzin
authors.affiliation: Department of Prosthodontics and Dental Materials, School of Dentistry, IMED - Meridional University, Passo Fundo, RS, Brazil.
authors.forename: Atais
authors.initials: A
authors.lastname: Bacchi
mesh_terms: D000134:Acid Etching, Dental; D000538:Aluminum Silicates / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D003738:Dental Cements; D003776:Dental Porcelain / Q000737:chemistry*; D017680:Potassium Compounds / Q000737:chemistry*; D011897:Random Allocation; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: D000538:Aluminum Silicates; D003188:Composite Resins; D003738:Dental Cements; D017680:Potassium Compounds; C493120:lithia disilicate; D003776:Dental Porcelain; C016447:feldspar; C078519:leucite; C023506:Glass ceramics