Mechanical properties of Y:TZP/TiO2 coated with hydroxyapatite for dental implants
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2017
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Dental Materials
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Purpose/aim: (1) To investigate the effect of titania content
in mol% (0, 10 and 30) in the specific surface area (SBET), the
size of the agglomerates and the intensity of the peaks corresponding
to crystalline phase present in the ceramic powder
of Y:TZP/TiO2; (2) to investigate the effect of titania addition (0,
10 and 30 mol%) on the microstructure, relative density (RD),
Young’s modulus (E), Poisson’s ratio (PR), flexural strength ( f)
andWeibull modulus (m) of a Y:TZP/TiO2 composite; and (3) to
investigate the effect of the presence of a biomimetic coating
on the microstructure and mechanical properties ( f and m) of
Y:TZP/TiO2 composite.
Materials and methods: Y:TZP (3mol% of yttria) and
Y:TZP/TiO2 composite (10 or 30mol% of titania) were synthesized
using a co-precipitation route. The powders were
pressed and sintered at 1400 ◦C/2 h. Half of the discs were
subjected to biomimetic coating. The powderswere characterized
by X-ray diffraction (XRD), laser scattering, gas adsorption
and scanning electron microscopy (SEM). The surfaces, with
and without biomimetic coating, were characterized by SEM
and XRD. The RD was measured by the Archimedes’ principle.
E and PRwere measured by ultrasonic pulse-echo method.
For the mechanical properties the specimens (n = 30 for each
group) were tested in a universal testing machine. Weibull
modulus was estimated by the maximum likelihood method
and ANOVA with Tukey test (˛ = 5%) was used to evaluate f, E
and RD.
Results: All powders had a SBET greater than 42m2/g and
the titania addition favored the formation of larger agglomerates.
Titania addition increased the grain size of the composite
and caused a significant decrease in the f in MPa (control:
815.4a; T10: 455.7b and T30: 336.0c), E in GPa (control: 213.4a;
T10: 155.8b and T30: 134.0c) and relative density in % (control:
99.0a; T10: 94.4c and T30: 96.3b) of the Y:TZP/TiO2 composite.
The presence of 30% titania caused substantial increase
in m and PR. Biomimetic coating resulted in the formation of
apatite globules heterogeneously distributed on the surface of
the material and this treatment did not significantly alter the
f and m of the composite (Table 1).
Conclusions: The Y:TZP/TiO2 composite coated with a layer
of CaP has great potential to be used as implant material. Properties
of the powderwere affected by titania addition. Addition
of titania toY:TZP caused an increase in grain size, a significant
decrease in f, E and RD. The presence of biomimetic coating
did not jeopardize the reliability of Y:TZP/TiO2 composite.
Como referenciar
MIRANDA, R.B.P.; MARCHI, J.; USSUI, V.; LAZAR, D.R.R.; MIRANDA, W.G.J.; CESAR, P.F. Mechanical properties of Y:TZP/TiO2 coated with hydroxyapatite for dental implants. Dental Materials, v. 33, p. e54-e54, 2017. suppl. 1. DOI: 10.1016/j.dental.2017.08.106. Disponível em: http://repositorio.ipen.br/handle/123456789/28642. Acesso em: 29 Mar 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.