Effect of two surface treatments for zirconia ceramic on adhesion and fatigue behavior

• Grant number: 10/20077-0
• Support Opportunities: Scholarships in Brazil - Doctorate
• Effective date (Start): May 01, 2011
• Effective date (End): June 30, 2014
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Luiz Felipe Valandro
• Grantee: Marina Amaral
• Host Institution: Faculdade de Odontologia (FOSJC). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil

Abstract

The aim of this study was to evaluate de effect of two surface treatments for silica deposition on zirconia ceramic surface, on Bond strength and mechanical behavior of this material. The hypothesis are that both surface treatments will enhance adhesion values between zirconia and resin cement, and that the silica layer will decrease zirconia's flexural strength and fatigue limits. To adhesion test, 45 zirconia bars were manufactured and received one of the following surface treatments: Control: no surface treatment; Silicatization: sandblasting with 35 µm alumina particles, followed by silane application; and Glaze: application of a thin layer of glaze, firing and HF etching, followed by silane application. Samples were cemented with resin cement to silicate-ceramic slices, and after 2,500 themocycles, the tensile bond strength was measured. For mechanical behavior evaluation, Disc-shaped samples from VITA In-Ceram 2000 YZ cubes for InLab ceramic were manufactured according to standard ISO 6872 to biaxial flexural strength test. The evaluated surface treatments were: Control, Silicatization and Glaze. Samples were submitted to biaxial flexural strength without and with mechanical cycling (2x106 cycles, 100 N, biaxial load, immerse in 37ºC distilled water, 4 Hz). The stair case method was applied to determination of fatigue limit of tested samples (102, 103, 104 e 105 cycles). Tensile bond strength was higher for Silicatization group, followed by Glaze group. Samples from Control group did not survive to thermocycling. Mechanical cycling did not affected biaxial flexural strength values, while surface treatment did: Silicatization group presented the highest values of flexural strength. On Weibull analysis, the lowest m values were presented by Silicatization. Glaze group without cycling, and the highest m value was presented by cycled group Glaze. Stair case analysis showed decrease in fatigue limits for the three surface treatments evaluated with higher number of cycles. Silicatization group kept the higher fatigue limits for each number of applied cicles. (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)

AMARAL, MARINA; CESAR, PAULO FRANCISCO; BOTTINO, MARCO ANTONIO; LOHBAUER, ULRICH; VALANDRO, LUIZ FELIPE. Fatigue behavior of Y-TZP ceramic after surface treatments. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, v. 57, p. 149-156, APR 2016. (10/20077-0)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

AMARAL, Marina. Influência de três tratamentos de superfície para cerâmicas a base de zircônia na resistência adesiva e no comportamento à fadiga do material. 2014. Doctoral Thesis - Universidade Estadual Paulista (Unesp). Instituto de Ciência e Tecnologia. São José dos Campos São José dos Campos.