Effect of titania content and biomimetic coating on the mechanical properties of the Y-TZP/TiO2 composite

Publication date: Available online 26 November 2017
Source:Dental Materials
Author(s): Ranulfo Benedito de Paula Miranda, Walter Gomes Miranda, Dolores Ribeiro Ricci Lazar, Valter Ussui, Juliana Marchi, Paulo Francisco Cesar
ObjectiveTo investigate the effect of titania addition (0, 10 and 30mol%) on the microstructure, relative density, Young's modulus (E), Poisson's ratio (υ), mechanical properties (flexural strength, σf, and Weibull modulus, m) of a Y-TZP/TiO2 composite. The effect of the presence of a biomimetic coating on the microstructure and mechanical properties was also evaluated.MethodsY-TZP (3mol% of yttria) and Y-TZP/TiO2 composite (10 or 30mol% of titania) were synthesized by co-precipitation. The powders were pressed and sintered at 1400°C/2h. The surfaces, with and without biomimetic coating, were characterized by X-ray diffraction analysis and scanning electron microscopy. The relative density was measured by the Archimedes' principle. E and υ were measured by ultrasonic pulse-echo method. For the mechanical properties the specimens (n=30 for each group) were tested in a universal testing machine.ResultsTitania addition increased the grain size of the composite and caused a significant decrease in the flexural strength (in MPa, control 815.4^a; T10 455.7^b and T30 336.0^c), E (in GPa, control 213.4^a; T10 155.8^b and T30 134.0^c) and relative density (control 99.0%^a; T10 94.4%^c and T30 96.3%^b) of the Y-TZP/TiO2 composite. The presence of 30% titania caused substantial increase in m and υ. Biomimetic coating did not affect the mechanical properties of the composite.SignificanceThe Y-TZP/TiO2 composite coated with a layer of CaP has great potential to be used as implant material. Although addition of titania affected the properties of the composite, the application of a biomimetic coating did not jeopardize its reliability.



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