Effect of titania addition and sintering temperature on the microstructure, optical, mechanical and biological properties of the Y-TZP/TiO2 composite
| Autor: | Ana Clara Fagundes Pedroni, Tayná Paula Leite, Nelson Batista de Lima, Márcia Martins Marques, Paulo Francisco Cesar, Juliana Marchi, Ranulfo Benedito de Paula Miranda |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Scanning electron microscope Weibull modulus Composite number Sintering 030206 dentistry 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure law.invention 03 medical and health sciences 0302 clinical medicine Flexural strength Magazine Mechanics of Materials law General Materials Science Cubic zirconia Composite material 0210 nano-technology General Dentistry |
| Zdroj: | Dental Materials. 36:1418-1429 |
| ISSN: | 0109-5641 |
| Popis: | Objective The aims of this study were: 1) to evaluate the effect of sintering temperature on microstructure, density and flexural strength of a 3Y-TZP/TiO2 composite containing 12.5 wt% of TiO2 compared to 3Y-TZP specimens (control); 2) to compare 3Y-TZP with the experimental 3Y-TZP/TiO2 composite, both sintered at 1400 °C, with respect to the following parameters: optical properties, characteristic strength, Weibull modulus, fatigue behavior, induction of osteoblasts proliferation and differentiation (mineralization nodules formation). Methods The 3Y-TZP and 3Y-TZP/TiO2 powders were uniaxially pressed and sintered at 1200 °C, 1300 °C, 1400 °C or 1500 °C for one hour in a furnace. The microstructural analysis consisted of X-ray diffraction and scanning electron microscopy. The density was measured by the Archimedes' principle and the flexural strength was obtained by the biaxial flexure test. The optical properties were measured using a spectrophotometer operating in the visible light wavelength range. The step-stress accelerated life testing was performed by the pneumatic mechanical cycler and the biological behavior achieved by using osteoblast-like cells (Osteo-1 cell line). Results Tetragonal zirconia was identified in all groups and cubic zirconia was identified only at 3Y-TZP group. The addition of TiO2 decreased the values of density and flexural strength of the composite 3Y-TZP/TiO2 in relation to 3Y-TZP regardless of the sintering temperature. The color difference between the two materials was not significant regarding L*a*b* parameters. The composite showed higher probability of failure, and induced higher proliferation and differentiation than control. Significance The composite developed have good aesthetic and biologics properties. However, its microstructure and mechanical properties need to be improved for future dental implant applications. |
| Databáze: | OpenAIRE |
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