Effect of CAD/CAM milling, polishing and sandblasting processes on the mechanical properties of different dental zirconia

• Grant number: 18/00465-7
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• Start date: June 11, 2018
• End date: January 10, 2019
• Field of knowledge: Health Sciences - Dentistry
• Principal Investigator: Paulo Francisco Cesar
• Grantee: Beatriz Togoro Ferreira da Silva
• Supervisor: Yu Zhang
• Host Institution: Faculdade de Odontologia (FO). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Institution abroad: New York University, United States
• Associated to the scholarship: 16/13117-1 - Effect of temporal width pulse of Er:YAG laser in zirconia morphology, roughness and bond strength, BP.DR

Abstract

The development of dental zirconia with higher yttria content, 4 mol.% yttria partially stabilized zirconia (4Y-PSZ) and 5 mol.% yttria partially stabilized zirconia (5Y-PSZ), which present high strength and excellent translucency, aims to significantly expand the clinical indications of monolithic zirconia restorations. The increased yttria content results in the presence of the stable cubic phase in these zirconia materials, significantly reducing phase transformation due to both mechanical stresses and low temperature degradation. Therefore, this study aims to evaluate the effects of various clinically relevant surface treatments on ultra translucent zirconia, including phase composition, surface characteristics, aging resistance, and mechanical properties. Twonew ultra translucent partially stabilized monolithic zirconia will be assessed: 4Y-PSZ and 5YPSZ. Three mol.% yttria-stabilized tetragonal zirconia (3Y-TZP) will be used as a reference.Specimens will be produced using different surface treatment methods: machining, polishingbefore sintering, polishing after sintering and sandblasting. The specimens will be evaluated,before and after low temperature aging, by different techniques: microstructure (n=3), surface topography (n=3), roughness (n=10), zirconia phase characterization (X-ray diffraction analysis - XRD) (n=3), hardness (n=10) and four-point bending flexural strength (n=10). Quantitative data obtained will be analyzed statistically (p <0.05) and qualitative observations will be thoroughly described in comparison.

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)

DA SILVA, BEATRIZ TOGORO FERREIRA; TREVELIN, LIVIA TOSI; SCHROETER, ANANDA CAROLINA; WILLERS, AMANDA ENDRES; CESAR, PAULO FRANCISCO; MATOS, ADRIANA BONA. Effect of silica coating and laser treatment on the flexural strength, surface characteristics, and bond strength of a dental zirconia. European Journal of Oral Sciences, v. 129, n. 1, JAN 2021. (15/13571-1, 16/13117-1, 18/00465-7)