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Synthesis and structural, physical and mechanical characterizations of nanoparticled Y-TZP glass-ceramic

Grant number: 17/18157-4
Support type:Scholarships in Brazil - Master
Effective date (Start): December 01, 2017
Effective date (End): February 28, 2019
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Ana Flávia Sanches Borges
Grantee:Victor Mosquim
Home Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil

Abstract

This in vitro study aims to synthesize a glass-ceramic reinforced by yttria-stabilized polycrystalline tetragonal zirconia (Y-TZP) and to characterize it structurally, physically and mechanically, comparing with two commercially available glass ceramics: lithium disilicate (IPS e.max CAD®, Ivoclar Vivadent, Leichstein) and zirconium oxide reinforced lithium silicate (Celtra Duo®, Dentsply). For this purpose, a nanoscaled Y-TZP powder will be obtained and mixed with a Tetraethylorthosilicate (TEOS) additive in the proportion 30/70 vol%, added to solvent, binder and deflocculant. In a previously lubricated metallic device with the dimensions proposed by ISO 6872 (4mm width X 2mm thickness X 14mm length), 5g of the mixture will be inserted and subjected to cold uniaxial pressing at 80 MPa. Then blocks for CAD/CAM C14 HTA1 IPS e.max CAD® and Celtra Duo® will be cut with diamond disc (245 rpm, under refrigeration) in bars of 4mm width X 2mm thickness X 14mm length. The groups will be composed by 10 bars of each material, being VEY (experimental glass-ceramic enhanced with Y-TZP nanoparticles), VCD (glass-ceramic Celtra Duo®) and VMAX (glass-ceramic IPS e.max CAD®). Initially, these bars will be submitted to evaluation of their optical properties on white and black backgrounds, which will allow the calculation of the material's contrast ratio and translucency parameter. Afterwards, these same bars will be subjected to 3-point bending test using a metal device under a 5000 N load cell at a constant speed of 0.5 mm/min attached to an Emic DL 500 universal testing machine and with the aid of an automation program Tesc® 2.0. The qualitative fractographic analysis of the fractured specimens will be performed using a DinoLite AM313T digital stereomicroscope, where 5 specimens from each group will be submitted to scanning electron microscopy (SEM) analysis. The obtained data will be organized and, if they present normal distribution, will be submitted to ANOVA and complemented with Tukey test; If there is a non-normal distribution, will be submitted to Kruskal-Wallis and Dunn non-parametric tests. For all cases, the level of significance will be set at 5% (p <0.05%). (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)
MOSQUIM, VICTOR; FERRAIRO, BRUNNA MOTA; VERTUAN, MARIELE; MAGDALENA, AROLDO GERALDO; FORTULAN, CARLOS ALBERTO; LISBOA-FILHO, PAULO NORONHA; CESAR, PAULO FRANCISCO; BONFANTE, ESTEVAM AUGUSTO; HONORIO, HEITOR MARQUES; SANCHES BORGES, ANA FLAVIA. Structural, chemical and optical characterizations of an experimental SiO2-Y-TZP ceramic produced by the uniaxial/isostatic pressing technique. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, v. 106, JUN 2020. Web of Science Citations: 0.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.