Development of Y-TZP/MWCNT-SiO2 nanocomposite for dental protheses

Author(s)

Silva, Lucas Hian da ; Rinaldi, Laura Ajamil ; Lazar, Dolores Ribeiro Ricci ; Ussui, Valter ; Tango, Rubens Nisie ; Belli, Renan ; Lohbauer, Ulrich ; Cesar, Paulo Francisco

• Document type: Journal article
• Source: JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS; v. 143, p. 9-pg., 2023-05-11.

Abstract

Y-TZP/MWCNT-SiO2 nanocomposite was synthesized by co-precipitation and hydrothermal treatment methods. After the characterization of the MWCNT-SiO2 powder, specimens were obtained from the synthesized material Y-TZP/MWCNT-SiO2 by uniaxial pressing for a second characterization and later comparison of its optical and mechanical properties with the conventional Y-TZP. The MWCNT-SiO2 was presented in bundles of carbon nanotubes coated by silica (mean length: 5.10 +/- 1.34 mu m /D90: 6.9 mu m). The composite manufactured was opaque (contrast ratio: 0.9929 +/- 0.0012) and had a white color with a slightly difference from the conventional Y-TZP (Delta E00: 4.4 +/- 2.2) color. The mechanical properties of Y-TZP/MWCNT-SiO2: vickers hardness (10.14 +/- 1.27 GPa; p = 0.25) and fracture toughness (4.98 +/- 0.30 MPa m1/2; p = 0.39), showed no significant difference from the conventional Y-TZP (hardness: 8.87 +/- 0.89; fracture toughness: 4.98 +/- 0.30 MPa m1/2). However, for flexural strength (p = 0.003), a lower value was obtained for Y-TZP/MWCNT-SiO2 (299.4 +/- 30.5 MPa) when compared to the control Y-TZP (623.7 +/- 108.8 MPa). The manufactured Y-TZP/MWCNT-SiO2 composite pre-sented satisfactory optical properties, however the co-precipitation and hydrothermal treatment methods need to be optimized to avoid the formation of porosities and strong agglomerates, both from Y-TZP particles and MWCNT-SiO2 bundles, which lead to a significant decrease in the material flexural strength. (AU)

• FAPESP's process: 12/16027-2 - Y-TZP/MWCNT-COOH nanocomposite development for dentistry application: characterization and aging
• Grantee: Paulo Francisco Cesar
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/00728-4 - Y-TZP/MWCNT-COOH nanocomposite development for dentistry application: characterization and aging
• Grantee: Lucas Hian da Silva
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 12/10955-5 - Y-TZP/MWCNT-COOH nanocomposite development for dentistry application: characterization and aging
• Grantee: Lucas Hian da Silva
• Support Opportunities: Scholarships in Brazil - Doctorate