Characterization and evaluation of adherence to a policristalina of tetragonal zirconia ceramic partially stabilized with yttria

• Grant number: 12/02945-0
• Support Opportunities: Scholarships in Brazil - Doctorate
• Effective date (Start): July 01, 2012
• Effective date (End): February 28, 2015
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Marco Antonio Bottino
• Grantee: Sabrina Feitosa Sochacki
• Host Institution: Faculdade de Odontologia (FOSJC). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil

Abstract

Objective: evaluate the parameters of adhesion between glaze and zirconia and zirconia + glaze and resin cement. The ceramic will be characterized (density, porosity, contact angle, scanning electron microscopy (SEM) and atomic force (AFM), energy-dispersive X-ray spectroscopy (EDX), grain boundary analysis, X-ray diffraction (XRD), Vickers hardness, fracture toughness, evaluation of elastic modulus and Poisson's ratio). For shear test between glaze and zirconia, specimens are prepared from Diazir full contour ceramic and divided into five groups: G1: untreated (control), G2: Surface AS-SINTERED + glaze; G3: blasting with aluminum oxide particles + glaze; G4: sandblasting with Al2O3 particles 30 microns modified silicon oxide (Cojet ® Sand, 3M ESPE) + glaze; G5: Piranha Solution treatment + glaze. Topography and roughness analysis of the surface will be performed AFM, EDS, SEM, optical digital perfilometry, contact angle analysis and Scratch test. For bond strength test between resin cement and ceramic treated (G1-G5) specimens' bars are made of zirconia. After the treatment, the surfaces will be etched with hydrofluoric acid and silanized. The cementation will be made with Variolink (Ivoclar Vivadent). Half of the specimens of each treatment will be tested 24 hours after cementation (immediate group), the other shall be subject to storage (90 days and thermocycling oven cycles 6000-G6: TC + G1 and G7: TC + G2, G8, G3 + CT ' G9: G4 + CT; G10: G5 + CT) and then will be held the shear test (1mm/min). For analysis of the retention force and bond strength, zirconia infrastructures will be made and adapted to a model in epoxy resin reinforced by glass fibers simulating a coronary preparation where the same surface treatment described above. The data obtained at different stages will be analyzed statistically. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

FEITOSA, SABRINA A.; LIMA, NELSON B.; YOSHITO, WALTER K.; CAMPOS, FERNANDA; BOTTINO, MARCO A.; VALANDRO, LUIZ F.; BOTTINO, MARCO C.. Bonding strategies to full-contour zirconia: Zirconia pretreatment with piranha solution, glaze and airborne-particle abrasion. INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES, v. 77, p. 151-156, SEP 2017. (12/02945-0)

FEITOSA, SABRINA A.; CAMPOS, FERNANDA; YOSHITO, WALTER KENJI; LAZAR, DOLORES R. R.; USSUI, VALTER; VALANDRO, LUIZ FELIPE; BOTTINO, MARCO A.; BOTTINO, MARCO C.. Effect of the bonding strategy on the tensile retention of full-contour zirconia crowns. INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES, v. 85, p. 106-112, OCT 2018. (12/02945-0)