Compósito de zircônia comercial com hidroxiapatita pura produzida via método sol gel para aplicações biomédicas
Due to its excellent mechanical properties such as toughness, mechanical strength and modulus of elasticity similar to that of stainless steel alloys, in addition to low toxicity, zirconia is a ceramic biomaterial with several applications. However, zirconia has low affinity with cells and tissue...
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| Formato: | Dissertação |
| Idioma: | por |
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/25486 |
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| Resumo: | Due to its excellent mechanical properties such as toughness, mechanical
strength and modulus of elasticity similar to that of stainless steel alloys, in addition to
low toxicity, zirconia is a ceramic biomaterial with several applications. However,
zirconia has low affinity with cells and tissues, since it is a bioinert material, and
because of its high mechanical properties in relation to the bone, irregular
concentrations of tension can appear, resulting in fracture. Hydroxyapatite, in turn,
belongs to the calcium phosphate family and has a high modulus of elasticity, and is
present in natural compounds such as hard tissue, bone, dentin and dental enamel,
being a bioactive material without adequate mechanical resistance. In order to obtain
a material with high fracture toughness and affinity with cells and tissues, zirconia and
hydroxyapatite composites were developed and investigated. For this work the zirconia
used was doped with 8% of yttria, commercial, and the hydroxyapatite was synthesized
by sol-gel method at different temperatures and calcination times (500°C/2h, 500°C/4h,
500°C/6h; 700°C/1h, 700°C/2h, 700°C/4h; 900°C/4h). The samples showed
commercial yttria doped zirconia layer followed by composite material layer produced
with commercial zirconia and hydroxyapatite calcined at 700°C/4h in the following
proportions YSZ/HA 95/5, YSZ/HA 90/10, YSZ/HA 85/15 and YSZ/HA 80/20. The
samples were characterized by: X-ray Diffraction (XRD), Fourier Transform Infrared
Spectroscopy (FTIR), BET Method, Archimedes Assay, Vickers Microhardness and
Scanning Electron Microscopy (SEM). The XRD results showed the formation of the
hydroxyapatite major phase at different temperatures and calcination times, with the
formation of the composite materials with surface area and hardness decreasing with
increasing presence of hydroxyapatite. The samples YSZ/HA 85/15 and YSZ/HA
80/20, presented the best mechanical behavior with higher fracture toughness values
of 9.2 and 9.3 MPa.m1/2, respectively. The sample YSZ/HA 85/15 with lower apparent
porosity (0.60%) and water absorption (0.10%). |
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