| Texto completo | |
| Autor(es): Mostrar menos - |
Strazzi-Sahyon, H. B.
;
Campos, T. M. B.
;
dos Santos, C.
;
Piza, M. M. T.
;
Alves, L. M. M.
;
Jalkh, E. B. Benalcazar
;
Bergamo, E. T. P.
;
Tebcherani, S. M.
;
Witek, L.
;
Coelho, P. G.
;
Yamaguchi, S.
;
Bonfante, E. A.
Número total de Autores: 12
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Dental Materials; v. 40, n. 9, p. 10-pg., 2024-08-14. |
| Resumo | |
Objective: To assess the influence of calcination process on the properties of minimally processed recycled 3Y-TZP, and to compare it with its commercial counterpart. Methods: Non-milled 3Y-TZP waste was collected, fragmented and ball-milled to a granulometric < 5 <mu>m. Half of the recycled powder was calcined at 900 degrees C. Recycled 3Y-TZP disks were uniaxially pressed and sintered to create two recycled groups: 1) Calcined and 2) Non-calcined to be compared with a commercial CAD/CAM milled 3Y-TZP. The microstructure of experimental groups was assessed through density (n = 6), scanning electron microscopy (n = 3) and energy-dispersive X-ray spectroscopy (n = 3); and the crystalline content was evaluated through X-ray diffraction (XRD) (n = 3). Optical and mechanical properties were investigated through reflectance tests (n = 10), and Vickers hardness, fracture toughness (n = 5), and biaxial flexural strength tests (n = 16), respectively. Fractographic analysis was performed to identify fracture origin and crack propagation. Statistical analyses were performed through ANOVA followed by Tukey<acute accent>s test, and by Weibull statistics. Results: Particle size distribution of recycled powder revealed an average diameter of similar to 1.60 mu m. The relative density of all experimental groups was > 98.15 % and XRD analysis exhibited a predominance of tetragonal-phase in both recycled groups, which were similar to the crystallographic pattern of the control group. Cross-section micrographs presented flaws on the non-calcined group, and a more homogeneous microstructure for the calcined and commercial groups. Commercial samples showed lower contrast-ratio and higher translucency-parameter than the recycled groups, where non-calcined presented higher translucency-parameter and lower contrast-ratio than its calcined counterpart. The commercial group presented higher fracture toughness and characteristic strength than the recycled groups. Moreover, the calcined group exhibited higher hardness, characteristic strength, and probability of survival at higher loads than the non-calcined group. Fractographic analysis depicted the presence of microstructural flaws in the non-calcined group, which may have acted as stress-raisers and led to failures at lower flexural strengths values. Significance: The calcination process improved the microstructure, optical, and mechanical properties of the recycled 3Y-TZP. (AU) | |
| Processo FAPESP: | 21/07440-2 - Infiltração graduada por vidro em uma zircônia ultra translúcida (5Y-PSZ): síntese, processamento e caracterização das propriedades físicas e mecânicas |
| Beneficiário: | Larissa Marcia Martins Alves |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 21/06730-7 - Rumo à zircônia sustentável reciclada a partir do descarte de usinagem e melhorada por infiltração graduada e ao desenvolvimento de blocos de zircônia multicamada resistentes, graduados, e não suscetíveis ao envelhecimento |
| Beneficiário: | Estevam Augusto Bonfante |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores - Fase 2 |
| Processo FAPESP: | 16/18818-8 - EMU concedido no processo 2012/19078-7: ElectroPuls E3000 Linear-Torsion All-Electric dynamic test instrument package |
| Beneficiário: | Estevam Augusto Bonfante |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Equipamentos Multiusuários |
| Processo FAPESP: | 20/12874-9 - Infiltração gradada por vidro em um compósito experimental à base de whiskers de alumina e zircônia: desenvolvimento, caracterização microestrutural e das propriedades ópticas e mecânicas |
| Beneficiário: | Tiago Moreira Bastos Campos |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 19/08693-1 - Compósitos experimentais à base de alumina e zircônia infiltrados por vidro: caracterização microestrutural e das propriedades ópticas e mecânicas. |
| Beneficiário: | Edmara Tatiely Pedroso Bergamo |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 22/12118-5 - Desenvolvimento do processo de reciclagem da 3Y-TZP e aplicação na produção de compósitos com gradientes de módulo elástico |
| Beneficiário: | Henrico Badaoui Strazzi Sahyon |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 22/07157-1 - Caracterização física e mecânica de um sistema multicamadas utilizando zircônia reciclada |
| Beneficiário: | Ernesto Byron Benalcazar Jalkh |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |