Effect of annealing after grinding on different systems of Y-TZP zirconia

• Grant number: 15/04552-3
• Support Opportunities: Regular Research Grants
• Start date: July 01, 2015
• End date: December 31, 2017
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Ligia Antunes Pereira Pinelli
• Grantee: Ligia Antunes Pereira Pinelli
• Host Institution: Faculdade de Odontologia (FOAr). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
• Associated researchers: Eduardo Bellini Ferreira ; Laiza Maria Grassi Fais ; Selma Gutierrez Antonio

Abstract

The aim of this study is to evaluate the effect of annealing after grinding on the surface properties, crystalline phases and on the flexural strength of two different zirconia Y-TZP (yttria partially stabilized tetragonal polycrystalline zirconia) systems. Y-TZP bars for core (Group Z) and for full contour (monolithic, Group MZ) will be distributed in 6 subgroups (n = 18) according to the performance (+) or not (-) of grinding (G), irrigation (I) and annealing (A) as follow: G-A- (control) and G-A+ (20 X 4 X 1.2mm); and G+I-A-, G+I-A+, G+I+A- and G+I+A+ (20 X 4 X 1.5mm). The grinding (0.3 mm) will be done in standardizing device using MasterCeram diamond stone wheel-shaped at low speed. The annealing of A+ groups will be conducted according to pilot study. In group Z, the zirconia core will be veneered with IPS e-max Ceram (1.8 mm thick) using ZirLiner, wash, two layers of dentin and glaze with the firing parameters recommended by the manufacturer. Topographic surface, free surface energy and mean roughness will be evaluated for determine the surface properties. X-ray diffraction technique will be used to assess the amount and type of crystalline phases. Samples will be subjected to 4 point- bending test in a MTS 810 machine (10 kN, 0.5 mm/min). The data will be compared by statistical analysis according to the most appropriate test adopting a significance level of 5%. (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)

CANDIDO, L. M.; FAIS, L. M. G.; FERREIRA, E. B.; ANTONIO, S. G.; PINELLI, L. A. P.. Characterization of a Diamond Ground Y-TZP and Reversion of the Tetragonal to Monoclinic Transformation. Operative Dentistry, v. 42, n. 4, p. 407-417, JUL-AUG 2017. (15/04552-3, 13/07793-6)

DE OLIVEIRA FRATUCELLI, ERICK DANTE; CANDIDO, LUCAS MIGUEL; PEREIRA PINELLI, LIGIA ANTUNES. Surface properties and flexural strength of a monolithic zirconia submitted to grinding and regenerative heat treatment. International Journal of Applied Ceramic Technology, v. 18, n. 2, DEC 2020. (15/04552-3)