Microstructural characterization and interactions in Ti- and TiH2-hydroxyapatite vacuum sintered composites

Marcelo, Teresa; Livramento, V.; Oliveira, Marize Varella de; Carvalho, Maria Helena Catelli de

doi:10.1590/s1516-14392006000100013

Cited by 25 publications

(32 citation statements)

References 16 publications

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“…The formation of Ti x P y phase(s) was also pointed out in composites produced with Ti and HA powders [10][11][12][13][14] . Some researchers report the presence of phases like Ti 4 P 3 or Ti 5 P 3 12 , or Ti 3 P 4 10 without any convincing analyses.…”

Section: In Vitro Testmentioning

confidence: 78%

“…This combination can be achieved by a powder metallurgy technique using appropriate mixtures of titanium and calcium phosphate powders. Many titanium composites containing hidroxiapatite, calcium phosphates or a mixture of varying contents of calcium and phosphorous compounds were synthesized through powder metallurgy under different processing conditions [9][10][11][12][13][14][15][16][17][18][19] . Although reporting densification and microstructure of biomaterials fabricated with various parameters, these investigations still cover a limited number of conditions such as raw materials, processing methods, particles size and their chemical and morphologic characteristics, which can lead to different results.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure development on sintered Ti/HA biocomposites produced by powder metallurgy

et al. 2011

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Titanium-based composites with in-situ calcium and phosphor phases were prepared by powder metallurgy processing with titanium and hydroxyapatite (HA) powders. The mixtures were performed in a friction mill with alcohol for 5 hours, dried in a rotating evaporator, pressed at 600 MPa and sintered at 1200 °C for 2 hours in argon atmosphere. Crystal phases of the as-fabricated composite are found to be, α-Ti, CaTiO 3 , Ca 3 (PO 4 ) 2 and Ti x P y phase(s). The analyses revealed that titanium particles were covered with a compact layer of Ti x P y and CaTiO 3 phases, which resulted from the decomposition of HA into CaTiO 3 and β-Ca 3 (PO 4 ) 2 at approximately 1025 °C. Then the reactions were followed by the decomposition of β-Ca 3 (PO 4 ) 2 , resulting in the growth of CaTiO 3 layer and in the nucleation and growth of Ti x P y phase(s).

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Section: In Vitro Testmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Microstructure development on sintered Ti/HA biocomposites produced by powder metallurgy

et al. 2011

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“…The porous titanium scaffold used in this study had a porosity of 36% and a mean interconnected pore diameter of 480 µm, allowing nutrients to enter the porous structure and form new bone. Earlier results we published about processing of scaffolds and porous coatings indicated that the size and quantity of titanium and spacer powders affect the resulting pore quantity and morphology 30,31,32 . Porous coatings with 11 to 24% porosity and pore sizes of 56 to 120 µm were produced with large titanium particles (500 µm) but without using spacer particles.…”

Section: Discussionmentioning

confidence: 99%

Porous titanium scaffolds produced by powder metallurgy for biomedical applications

et al. 2008

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Porous titanium scaffolds are promising materials for biomedical applications such as prosthetic anchors, fillers and bone reconstruction. This study evaluated the bone/titanium interface of scaffolds with interconnected pores prepared by powder metallurgy, using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Porous scaffolds and dense samples were implanted in the tibia of rabbits, which were subsequently killed 1, 4, and 8 weeks after surgery. Initial bone neoformation was observed one week after implantation. Bone ingrowth in pores and the Ca/P ratio at the interface were remarkably enhanced at 4 and 8 weeks. The results showed that the interconnected pores of the titanium scaffolds promoted bone ingrowth, which increased over time. The powder metallurgy technique thus proved effective in producing porous scaffolds and dense titanium for biomedical applications, allowing for adequate control of pore size and porosity and promoting bone ingrowth.

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“…O pó de hidreto de titânio foi obtido pela hidrogenação a 500 o C de finos de esponja de titânio, seguida pela moagem por 6 horas. O diâmetro médio das partí-culas de TiH 2 , medido por difração a laser, foi de aproximadamente 15 µm [11].…”

Section: Materiais Utilizados E Misturaunclassified

“…Os trabalhos existentes [8,11] se limitaram basicamente ao estudo das fases formadas em compósitos fabricados com hidroxiapatita micrométrica. Para isso usaram geralmente quantidades iguais ou superiores a 10% em volume de fosfatos de cál-cio.…”

Section: Introductionunclassified

Preparação e caracterização de um biocompósito obtido pela mistura de hidreto de titânio com nitrato de cálcio para implantes dentários

et al. 2016

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RESUMONeste trabalho foram realizados estudos sobre a fabricação de um biocompósito à base de titânio para implantes dentários a partir da mistura de pó de hidreto de titânio (92%) com nitrato de cálcio (8% em volume). O pó de hidreto de titânio foi adicionado na solução aquosa de nitrato de cálcio, dissolvido por agitação mecânica, e em seguida os precursores foram misturados e dispersados/homogeneizados por ultrassom. Posteriormente, a mistura foi secada em evaporador rotativo, compactada com 600 MPa à temperatura ambiente, desmoldada e sinterizada em alto vácuo a 1200 o C durante 2 horas. Foi analisada a microestrutrura e fases formadas, as propriedades mecânicas, a rugosidade da superfície, a porosidade aberta, a molhabilidade da superfície e a citotoxicidade do biocompósito. As fases identificadas após a sinterização foram α-Ti e CaTiO 3 . O limite de resistência em compressão, o módulo de Young (E) e o ângulo de contato do biocompósito diminuíram significativamente com relação ao hidreto de titânio puro sinterizado nas mesmas condições. O limite médio de resistência em compressão do hidreto de titânio foi de 1794,67 MPa e do biocompósito foi de 481,36 MPa. O módulo de Young e o ângulo de contato do hidreto de titânio e do biocompósito foram de aproximadamente 112 GPa e 94 graus, e de 75 GPa e 83 graus, respectivamente. A rugosidade de superfície foi da mesma ordem de grandeza entre os materiais e ficou aproximadamente entre 1,4 e 1,5 µm (Ra) e 1,4 e 1,9 µm (Ra e Sa), medidas com rugosímetro de contato e com microscópio confocal a laser, respectivamente. A porosidade aberta do biocompósito sinterizado foi de aproximadamente três vezes maior do que aquela do hidreto de titânio sinterizado. Nos ensaios de citotoxicidade a porcentagem de células viáveis do biocompósi-to foi superior àquela do controle negativo e àquela do hidreto de titânio sinterizado.Palavras-chave: titânio, nitrato de cálcio, biocompósito, implantes dentários. ABSTRACTA titanium-based biocomposite was prepared from titanium hydrate powder and calcium nitrate for dental implant applications. The minor precursor was added in the major precursor of titanium hydrate in the concentration of 8% in volume. Titanium hydrate was added in the calcium nitrate solution, previously dissolved by mechanical agitation in distilled water, and then mixed/homogenized by ultrasound. The mixture was dried in a rotating evaporator, pressed at 600 MPa at room temperature and vacuum sintered at 1200 o C during 2 hours. It was analyzed the microstructure and phases formed, the mechanical properties, the surface roughness, the open porosity, the surface wetness and cytotoxicity of the materials. The phases formed in the biocomposite after sintering were α-Ti and CaTiO 3 . The compressive strength, Young modulus (E) and contact angle of the biocomposite significantly decreased compared to the sintered titanium hydrate. The average compressive strength of the titanium hydrate was 1794,67 MPa and of the biocomposite was 481,36 MPa. The Young modulus and contact angle o...

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Microstructural characterization and interactions in Ti- and TiH2-hydroxyapatite vacuum sintered composites

Cited by 25 publications

References 16 publications

Microstructure development on sintered Ti/HA biocomposites produced by powder metallurgy

Microstructure development on sintered Ti/HA biocomposites produced by powder metallurgy

Porous titanium scaffolds produced by powder metallurgy for biomedical applications

Preparação e caracterização de um biocompósito obtido pela mistura de hidreto de titânio com nitrato de cálcio para implantes dentários

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