title: Improving shear bond strength between feldspathic porcelain and zirconia substructure with lithium disilicate glass-ceramic liner.
abstract: This study investigated the shear bond strength (SBS) between veneering porcelain and zirconia substructure using lithium disilicate glass-ceramic as a liner. The mineral phases and microstructures of lithium disilicate glass-ceramic at temperature range of 800-900°C were preliminarily investigated. SBSs of porcelain-veneered zirconia specimens with and without lithium disilicate glassceramic liner fired at the same temperature were determined. Results showed that SBSs of veneering porcelain and zirconia with lithium disilicate glass-ceramic liner was notably increased (p<0.05). Specimens from the group with the highest SBS (59.7 MPa) were subject to thermocycling up to 10,000 cycles and their post-thermocycling SBSs investigated. Though weakened by thermocycling, SBSs were above the clinically acceptable limit (25 MPa) of ISO 9693. Fractographic analysis revealed mixed cohesive and adhesive failures. It was concluded that lithium disilicate glass-ceramic is a potential liner which generated high SBS between veneering porcelain and zirconia.
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University.
authors.forename: Kamolporn
authors.initials: K
authors.lastname: Wattanasirmkit
authors.forename: Viritpon
authors.initials: V
authors.lastname: Srimaneepong
authors.forename: Kanchana
authors.initials: K
authors.lastname: Kanchanatawewat
authors.forename: Naruporn
authors.initials: N
authors.lastname: Monmaturapoj
authors.forename: Pasutha
authors.initials: P
authors.lastname: Thunyakitpisal
authors.forename: Supatra
authors.initials: S
authors.lastname: Jinawath
mesh_terms: D002516:Ceramics / Q000737:chemistry*; D001840:Dental Bonding; D003736:Dental Cavity Lining; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis; D003801:Dental Veneers; D006358:Hot Temperature; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D033081:Shear Strength; D013499:Surface Properties; D014961:X-Ray Diffraction; D015040:Zirconium / Q000737:chemistry*
chemical_list: C493120:lithia disilicate; D003776:Dental Porcelain; C023506:Glass ceramics; D015040:Zirconium; C028541:zirconium oxide