Готові списки джерел за темами / Calcium phosphate bioceramic

Добірка наукової літератури з теми "Calcium phosphate bioceramic"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Calcium phosphate bioceramic"

1

Pattanayak, Deepak K., B. T. Rao, and T. R. Rama Mohan. "Calcium phosphate bioceramics and bioceramic composites." Journal of Sol-Gel Science and Technology 59, no. 3 (November 4, 2010): 432–47. http://dx.doi.org/10.1007/s10971-010-2354-y.

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2

FINISIE, MELLATIE R., ATCHE JOSUÉ, VALFREDO T. FÁVERE, and MAURO C. M. LARANJEIRA. "Synthesis of calcium-phosphate and chitosan bioceramics for bone regeneration." Anais da Academia Brasileira de Ciências 73, no. 4 (December 2001): 525–32. http://dx.doi.org/10.1590/s0001-37652001000400006.

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Анотація:
Bioceramic composites were obtained from chitosan and hydroxyapatite pastes synthesized at physiological temperature according to two different syntheses approaches. Usual analytical techniques (X-ray diffraction analysis, Fourier transformed infrared spectroscopy, Thermo gravimetric analysis, Scanning electron microscopy, X-ray dispersive energy analysis and Porosimetry) were employed to characterize the resulting material. The aim of this investigation was to study the bioceramic properties of the pastes with non-decaying behavior from chitosan-hydroxyapatite composites. Chitosan, which also forms a water-insoluble gel in the presence of calcium ions, and has been reported to have pharmacologically beneficial effects on osteoconductivity, was added to the solid phase of the hydroxyapatite powder. The properties exhibited by the chitosan-hydroxyapatite composites were characteristic of bioceramics applied as bone substitutes. Hydroxyapatite contents ranging from 85 to 98% (w/w) resulted in suitable bioceramic composites for bone regeneration, since they showed a non-decaying behavior, good mechanical properties and suitable pore sizes.
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3

LIANG, H., Y. HUANG, F. HE, H. F. DING, and Y. Z. WAN. "ENHANCED CALCIUM PHOSPHATE PRECIPITATION ON THE SURFACE OF Mg-ION-IMPLANTED ZrO2 BIOCERAMIC." Surface Review and Letters 14, no. 01 (February 2007): 71–77. http://dx.doi.org/10.1142/s0218625x07009086.

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Modification of bioceramics by ion implantation of magnesium ( Mg ) is of interest as Mg is the fourth abundant cation in the human body. In this work, magnesium was ion-implanted into a ZrO 2 based bioceramic stabilized with Y 2 O 3 and Al 2 O 3. Both Mg -implanted and unimplanted samples were soaked in a simulated body fluid (SBF) for a period of time. The deposits on the surface of various samples were characterized with scanning electron microscope (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). We find that the Mg -implanted ZrO 2 shows better bioactivity than the plain bioceramic. These results indicate that Mg -implantation can improve the bioactivity of the ZrO 2 based bioceramic. Mechanisms governing the improvement are discussed in this paper.
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4

Gittings, J. P., I. G. Turner, and A. W. Miles. "Calcium Phosphate Open Porous Scaffold Bioceramics." Key Engineering Materials 284-286 (April 2005): 349–52. http://dx.doi.org/10.4028/www.scientific.net/kem.284-286.349.

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Calcium phosphate (CaP) ceramics possessing an interconnecting porosity network in the appropriate size range for vascularisation offer the possibility of providing a structural matrix for replacement of diseased or damaged bone. Such bioceramics must possess sufficient mechanical strength to avoid failure whilst offering a bioactive surface for bone regeneration. The objective of the current study was to produce a hydroxyapatite/tricalcium phosphate (HA/TCP) bioceramic that imitated the orientated trabecular structure found in cancellous bone. The structure-property relationship of these bioceramics was then analysed. It was hypothesised that the mechanical properties would be linked to the shape of the pore structure due to the orientation of the open porous scaffolds (OPS) produced. OPS bioceramics possessed an interconnected macroporosity network of 40-70% by volume with bending strengths of 0.30MPa ± 0.01MPa and apparent densities of 0.35g/cm3 ± 0.05g/cm3. Typically, pore sizes in the range of 150-300µm were produced. The fabrication of CaP OPS resulted in a wide range of macroporosity in the correct size range for osseointegration to occur. Elongating the pore structure did not affect the total porosity of the bioceramics. Strengths were low due to microcrack formation on sintering and not due to the shape of the pores present in the scaffold as initially hypothesised.
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5

Albuquerque, J. S. V., I. W. L. Franca, G. F. Silva, A. L. O. Ferreira, and R. E. F. Q. Nogueira. "Macroporous Calcium Phosphate Bioceramics as Drug Release Agents: A Kinetics Study of Ampicillin Release." Key Engineering Materials 396-398 (October 2008): 675–78. http://dx.doi.org/10.4028/www.scientific.net/kem.396-398.675.

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Semi-synthetic beta-lactam antibiotics are the most important class of antibacterial agents. Their use in veterinary and human medicine is in continuous expansion. Calcium phosphate bioceramics have been used in medicine and dentistry for nearly 30 years. Calcium phosphate ceramics (CPC) are nowadays being widely used as drug delivery systems because of their desirable properties such as biocompatibility, bioresorbability, controlled release etc. In recent years In this work, kinetic models to describe ampicillin adsorption from CPC were investigated. Calcium phosphate bioceramic are analogous to the mineral component of bones, its properties make it suitable for implant materials and delivery agents of drugs
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6

Hussain, Wafaa A., Entessar H. A. Al-Mosawe, Mukhlis M. Ismail, and Luay H. Alwan. "Porous Biphasic Calcium Phosphate for Biomedical Application." Journal of Biomimetics, Biomaterials and Biomedical Engineering 49 (February 2021): 101–10. http://dx.doi.org/10.4028/www.scientific.net/jbbbe.49.101.

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Excellent osteoconductivity and resorbability achieved when porous bioceramics have highsurface area that providing fast bone ingrowth. Porous samples were fabricated by using biphasic calcium phosphate BCP (achieved from HA heat treated at 850 oC) with 10 and 20 wt% of ovalbumin binder powder and mixture of carrot fibers and ovalbumin powders (1:1) then dried at 60oC and fired at 1300 oC. Structural, physical and mechanical properties of the prepared porous bioceramic were determined involved X-ray diffraction, Fourier transform infrared spectroscopy FTIR, apparent porosity, water absorption, apparent solid density and compressive strength. The results of X-ray and FTIR showed that the heat treatment of HA was succeeded in forming biphasic calcium phosphate. The apparent porosity values increased with increasing of the binder and carrot fibers content and the growths density of bacteria on bioceramics are less than natural bone. The effect of pathogenic bacteria (Pseudomonas & Staphylococcus) that cause pollution on porous calcium phosphate and natural bone (Albino mice) has been studied.
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7

Tavoni, Marta, Massimiliano Dapporto, Anna Tampieri, and Simone Sprio. "Bioactive Calcium Phosphate-Based Composites for Bone Regeneration." Journal of Composites Science 5, no. 9 (August 27, 2021): 227. http://dx.doi.org/10.3390/jcs5090227.

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Анотація:
Calcium phosphates (CaPs) are widely accepted biomaterials able to promote the regeneration of bone tissue. However, the regeneration of critical-sized bone defects has been considered challenging, and the development of bioceramics exhibiting enhanced bioactivity, bioresorbability and mechanical performance is highly demanded. In this respect, the tuning of their chemical composition, crystal size and morphology have been the matter of intense research in the last decades, including the preparation of composites. The development of effective bioceramic composite scaffolds relies on effective manufacturing techniques able to control the final multi-scale porosity of the devices, relevant to ensure osteointegration and bio-competent mechanical performance. In this context, the present work provides an overview about the reported strategies to develop and optimize bioceramics, while also highlighting future perspectives in the development of bioactive ceramic composites for bone tissue regeneration.
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Zheng, Min, Ding Fan, Jian Bin Zhang, and Xiu Kun Li. "Effect of Ceria Additive on Microstructure and Properties of Laser-Cladded Bioceramic Coating." Key Engineering Materials 434-435 (March 2010): 586–89. http://dx.doi.org/10.4028/www.scientific.net/kem.434-435.586.

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The calcium phosphate bioceramic coating was fabricated on titanium alloy (Ti-6Al-4V) substrate by a 5kW continuous transverse flow CO2 laser. Due to the peculiar role of rare earth oxide in laser cladding, the effect of ceria additive on the microstructure and properties of laser-cladded bioceramic coating was investigated by means of scanning electron microscope (SEM), X-ray diffraction (XRD), microhardness and corrosion resistance testing. The results indicate that the appearance of rare earth oxide ceria in the precursor powders has an impact on the microstructure and properties of the laser-cladded bioceramic coating. Calcium phosphate bioceramic such as hydroxyapatite (HA) and β-tricalcium phosphate (β-TCP) are synthesized on the top surface of laser-cladded specimens. And the addition of rare earth oxide ceria in pre-placed powders has an influence on the formation of calcium phosphate bioceramic phases. Furthermore, it reveals that the laser-cladded bioceramic coating of ceria additive in pre-placed powders has more favorable microhardness and corrosion resistance compared with the coating without rare earth oxide.
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Hesaraki, Saeed, A. Zamani, and M. Hafezi. "Montmorillonite-Added Calcium Phosphate Bioceramic Foams." Key Engineering Materials 361-363 (November 2007): 111–14. http://dx.doi.org/10.4028/www.scientific.net/kem.361-363.111.

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Анотація:
The present work was performed to improve the mechanical strength of porous calcium phosphate blocks by adding a little amount of montmorillonite mineral to the calcium phosphate composition. 3.5 wt % of the montmorillonite mineral was added to the slurry of precipitated hydroxyapatite and the porosity was produced by infiltration of a polymer template. After the firing process (1200 oC), the compressive strength, phase composition, morphology and dissolution behavior of the porous bodies were evaluated by appropriate techniques. It was found that the additive improved the mechanical strength but decreased the dissolution rate of the porous calcium phosphate body. Also the final composition of the porous block (i.e. hydroxyapatite, HA, and β- tricalcium phosphate, β-TCP) was not influenced through the presence of the additive. It is suggested that the montmorillonite mineral can improve the sintering performance of the HA and β- TCP.
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Jung, Yoona, Jooseong Kim, Sukyoung Kim, Shin hye Chung, and Jinhong Wie. "Development of Cellular Signaling Pathways by Bioceramic Heat Treatment (Sintering) in Osteoblast Cells." Biomedicines 11, no. 3 (March 5, 2023): 785. http://dx.doi.org/10.3390/biomedicines11030785.

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Анотація:
Bioceramics are calcium-phosphate-based materials used in medical and dental implants for replacing or repairing damaged bone tissues; however, the effect of bioceramic sintering on the intracellular signaling pathways remains unknown. In order to address this, we analyzed the impact of sintering on the cell signaling pathways of osteoblast cells using sintered and non-sintered hydroxyapatite (HA) and beta-tricalcium phosphate (β-TCP). X-ray diffraction indicated that only the morphology of HA was affected by sintering; however, the sintered bioceramics were found to have elevated the calcium concentrations in relation to the non-sintered variants. Both bioceramics inhibited the JNK signaling pathway; the sintered HA exhibited half the value of the non-sintered variant, while the sintered β-TCP rarely expressed a p-JNK value. The total Src and Raptor protein concentrations were unaffected by the sintering, while the p-Src concentrations were decreased. The p-EGFR signaling pathway was regulated by the non-sintered bioceramics, while the p-p38 concentrations were reduced by both the sintered β-TCP and HA. All of the bioceramics attenuated the total AKT concentrations, particularly the non-sintered HA, and the AKT phosphorylation concentration, except for the non-sintered β-TCP. Thus, the sintering of bioceramics affects several intracellular signaling pathways. These findings may elucidate the bioceramic function and expand their application scope as novel substrates in clinical applications.
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Більше джерел

Дисертації з теми "Calcium phosphate bioceramic"

1

Ramírez, Caballero Silvia. "Composites made of bioceramic and chitosan physical hydrogel as potential bone substitutes." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI010/document.

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Les substituts osseux synthétiques servent au remplacement temporaire des tissus osseux, favorisent la formation, la croissance et la survie de l’os et sont biorésorbables. Aucun matériau monophasé ne remplissant complètement ces exigences, un matériau composite bioinspiré est une alternative possible. L’objectif de cette thèse était par conséquent d’étudier la synthèse et les propriétés de deux composites biocéramiques/biopolymères : des hydrogels physiques de chitosane minéralisés avec de l’apatite, et une hardystonite architecturée imprégnée par des hydrogels physiques de chitosane. Afin d’obtenir le premier matériau, deux approches ont été développées. La première a consisté à fabriquer des hydrogels physiques de chitosane puis à les minéraliser avec de l’apatite ; la formation de microcapillaires se produit avec des conditions de synthèse spécifiques, et les précipités d’apatite ont été trouvés uniquement à la surface des hydrogels. La seconde approche consiste à convertir des suspensions homogènes contenant le phosphate de calcium et le chitosane en hydrogels de chitosane minéralisés par l’apatite. Les suspensions ont été préparées soit avec un mélange simultané, soit avec des mélanges successifs de suspensions phosphates de calcium avec les solutions de chitosane. Des agrégats minéraux plus petits avec une distribution plus uniforme ont été formés avec la méthode des mélanges successifs. Cela est attribué à une meilleure homogénéité, une viscosité plus faible et l’absence de chitosane. De manière générale, trois paramètres influencent les propriétés mécaniques d’hydrogels de chitosane minéralisés : la base utilisée pour la gélification (déterminant la vitesse de gélification : une grande vitesse conserve l’enchevêtrement des chaînes, résultant en une meilleure élasticité) ; la densité de la réticulation physique (cela induit un module de conservation plus important) et la force ionique (qui mène au désenchevêtrement des chaînes de chitosane, donc, à un faible module de conservation). Cette compréhension a permis l’utilisation de ces suspensions de phosphate de calcium-chitosane en tant qu’encre pour l’impression 3D. Les hydrogels de chitosane et les hydrogels minéralisés ne sont pas cytotoxiques. Pour fabriquer le second matériau, une encre pré-céramique a été imprimée en 3D puis frittée pour former une céramique d’hardystonite cristalline. Les scaffolds d’hardystonite ont été imprégnés par la solution de chitosane, converties ensuite en hydrogels physiques de chitosane. A plus forte concentration de chitosane, la viscosité de la solution était plus grande et l’imprégnation de la matrice plus lente. Avec une vitesse de gélification plus importante, qui dépend de la base utilisée pour la gélification, la perte de poids est plus faible pendant la gélification. L’hydrogel de chitosane a partiellement rempli les pores participant au support de charges externes et à la dissipation d’énergie par rupture
Bone substitutes, an approach to attend social demand for bone healing and reparation, are temporary replacements of bone tissue, promote bone formation and growth and finally are bioresorbed. No single material meets these requirements; an alternative is a bioinspired composite material. The objective of this thesis was thus to study the synthesis and properties of two bioceramics/biopolymer composites: chitosan physical hydrogels mineralized with apatite and hardystonite scaffolds impregnated with chitosan physical hydrogels. To obtain the first material, two strategies were developed. The first one consisted in the fabrication of chitosan physical hydrogels and its subsequent mineralization with apatite; the formation of micro-capillaries occurred under particular synthesis conditions, and apatite precipitates were found only on the surface of hydrogels. The second strategy consisted in a simultaneous conversion of chitosan-calcium phosphate suspensions into chitosan-apatite hydrogels. The suspensions were prepared by sequential or simultaneous mixing of calcium and phosphate suspensions with chitosan solutions. Smaller and more uniformly distributed mineral aggregates were formed following sequential mixing, attributed to higher homogeneity, lower viscosity and no-presence of chitosan. This enabled the use of these chitosan-calcium phosphate suspensions as inks for 3-D printing. In general, three factors impacted the mechanical properties of mineralized chitosan hydrogels: the base used for gelation (determining the gelation rate: a higher rate preserved chain entanglement, resulting in higher elasticity); the density of physical crosslinks (hence a higher storage modulus) and the ionic strength (that led to chitosan chain disentanglements, thus, low storage modulus). Chitosan hydrogels and mineralized hydrogels were not cytotoxic, having no deleterious effects on osteoblasts proliferation. To fabricate the second material, pre-ceramic ink was 3-D printed and then sintered to form crystalline hardystonite ceramic. Hardystonite scaffolds were impregnated with chitosan solution that was, next, converted to chitosan physical hydrogel. At higher chitosan concentration, viscosity of solution was higher and scaffold impregnation was lower. At higher gelation rate, which depend on base used for gelation, lower weight loss during gelation. Chitosan hydrogel partially filled the pores contributing to bearing of external loads and to energy dissipated by fracture
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Seifert, Gabrielle Victoria. "Amorphous Calcium Phosphate Composites of a Phenylalanine-based Poly(ester urea) Poly(1-PHE-6)." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1460388339.

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3

Dórea, Neto Francisco de Assis. "Avaliação do cimento de alfa-fosfato tricálcico em artrodeses tarsocrurais experimentais em cães /." Jaboticabal : [s.n.], 2007. http://hdl.handle.net/11449/101130.

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Orientador: João Guilherme Padilha Filho
Banca: Paola Castro Morais
Banca: Patricia Popak Giordano
Banca: Delphim da Graça Macoris
Banca: Márcia Rita Fernandes Machado
Resumo: Objetivou-se nesta pesquisa estudar o comportamento e a bioatividade do cimento de alfa-fosfato tricalcico de dupla pega em artrodeses tarsocrurais. Utilizaram-se seis caes, adultos, macho ou femeas, sem raca definida, com idades entre dois e cinco anos e pesando entre 18 e 30 kg. Foram constituidos dois grupos com 3 animais cada: um grupo onde empregou-se o cimento de ¿-fosfato tricalcico de dupla pega (Grupo I) e outro utilizando osso esponjoso autogeno (Grupo II). A avaliacao radiografica ocorreu aos 30, 45, 60, 90 e 120 dias apos o procedimento cirurgico. Radiograficamente, a fusao dos ossos das articulacoes ocorreu em ambos os grupos apos o 30o dia, sem qualquer reacao adversa ou do tipo corpo estranho. A estabilidade das articulacoes foi satisfatoria com a utilizacao de fixadores esqueleticos externos. Histologicamente, aos 120 dias, observaram-se diferencas na maturidade das celulas osseas entre os dois grupos ocorrendo absorcao lenta e remodelacao da bioceramica (Grupo I). Relativamente a microscopia eletronica de varredura, foi observada formacao de osso novo diretamente na superficie da bioceramica, sem causar formacao de lacuna entre a interface osso-ceramica. O cimento de alfa-fosfato tricalcico de dupla pega demonstrou ter uma boa resistencia mecanica, propriedades de biocompatibilidade, crescimento osseo direto sobre a ceramica, osteoconducao e, ainda, ocorrencia de lenta absorcao quando comparado ao enxerto ósseo.
Abstract: The purpose of this research was to estuding the behaviour and bioactivity of the á-tricalcium phosphate cement double setting in tarsocrural arthrodesis. Therefore, six canines, both male and female adults mongrel dogs, aged between two and five years old and weighing between 12 and 18kg, were the objects of this study. They were vi divided into two groups with three animals each. On Group I á-tricalcium phosphate cement double setting was used. The Group II, also considered the control group, autogenous cancellous bone graft was used. The periods chosen for the radiographic analysis were 30, 45, 60, 90 and 120 days after surgery. Radiographyc bone fusions on the joints were observed on both groups after 30 days. The stabilization of the joints with external fixators proved to be very satisfactory. No reaction of foreigh body or infection process due to the material used was observed. The histological analysis performed after 120 days after surgery revealed differences in terms of the maturity of the bone cells between the two groups, showing slow absorption and remodelling of the bioceramic (Group I). In terms of the scanning electronic microscopy, bone growth was detected, right on the surface of the bioceramic, without causing gap formation on the bone-ceramic joint. The á-tricalcium phosphate cement double setting demonstrated to have a good mechanical resistance, bioacompatibility properties, direct bone growth on the ceramic and osteocondution and, still, the occurrence of slow absorption when compared to the bone graft.
Doutor
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4

Dórea, Neto Francisco de Assis [UNESP]. "Avaliação do cimento de alfa-fosfato tricálcico em artrodeses tarsocrurais experimentais em cães." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/101130.

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Made available in DSpace on 2014-06-11T19:31:08Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-03-28Bitstream added on 2014-06-13T20:21:57Z : No. of bitstreams: 1 doreaneto_fa_dr_jabo.pdf: 1608125 bytes, checksum: 3f4786116d52404397afbb4ba51cd232 (MD5)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Objetivou-se nesta pesquisa estudar o comportamento e a bioatividade do cimento de alfa-fosfato tricalcico de dupla pega em artrodeses tarsocrurais. Utilizaram-se seis caes, adultos, macho ou femeas, sem raca definida, com idades entre dois e cinco anos e pesando entre 18 e 30 kg. Foram constituidos dois grupos com 3 animais cada: um grupo onde empregou-se o cimento de ¿-fosfato tricalcico de dupla pega (Grupo I) e outro utilizando osso esponjoso autogeno (Grupo II). A avaliacao radiografica ocorreu aos 30, 45, 60, 90 e 120 dias apos o procedimento cirurgico. Radiograficamente, a fusao dos ossos das articulacoes ocorreu em ambos os grupos apos o 30o dia, sem qualquer reacao adversa ou do tipo corpo estranho. A estabilidade das articulacoes foi satisfatoria com a utilizacao de fixadores esqueleticos externos. Histologicamente, aos 120 dias, observaram-se diferencas na maturidade das celulas osseas entre os dois grupos ocorrendo absorcao lenta e remodelacao da bioceramica (Grupo I). Relativamente a microscopia eletronica de varredura, foi observada formacao de osso novo diretamente na superficie da bioceramica, sem causar formacao de lacuna entre a interface osso-ceramica. O cimento de alfa-fosfato tricalcico de dupla pega demonstrou ter uma boa resistencia mecanica, propriedades de biocompatibilidade, crescimento osseo direto sobre a ceramica, osteoconducao e, ainda, ocorrencia de lenta absorcao quando comparado ao enxerto ósseo.
The purpose of this research was to estuding the behaviour and bioactivity of the á-tricalcium phosphate cement double setting in tarsocrural arthrodesis. Therefore, six canines, both male and female adults mongrel dogs, aged between two and five years old and weighing between 12 and 18kg, were the objects of this study. They were vi divided into two groups with three animals each. On Group I á-tricalcium phosphate cement double setting was used. The Group II, also considered the control group, autogenous cancellous bone graft was used. The periods chosen for the radiographic analysis were 30, 45, 60, 90 and 120 days after surgery. Radiographyc bone fusions on the joints were observed on both groups after 30 days. The stabilization of the joints with external fixators proved to be very satisfactory. No reaction of foreigh body or infection process due to the material used was observed. The histological analysis performed after 120 days after surgery revealed differences in terms of the maturity of the bone cells between the two groups, showing slow absorption and remodelling of the bioceramic (Group I). In terms of the scanning electronic microscopy, bone growth was detected, right on the surface of the bioceramic, without causing gap formation on the bone-ceramic joint. The á-tricalcium phosphate cement double setting demonstrated to have a good mechanical resistance, bioacompatibility properties, direct bone growth on the ceramic and osteocondution and, still, the occurrence of slow absorption when compared to the bone graft.
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5

Hsu, Yu-Hsiu. "Fabrication of porous calcium phosphate bioceramics." Thesis, University of Bath, 2005. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425267.

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6

Fernandes, Juliana Machado. "Síntese e caracterização de cimento de alfa-fosfato tricálcico reforçado com hidrogel de alginato de sódio e PVA para aplicação médico-odontológica." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/96502.

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Os cimentos de fosfato de cálcio (CFCs) têm atraído grande interesse para uso em ortopedia e odontologia como substitutos para partes danificadas do sistema esquelético, mostrando boa biocompatibilidade e osteointegração, permitindo sua utilização como enxerto ósseo. As características que determinam os CFCs biomateriais atrativos para a reconstituição ou remodelação óssea, são a facilidade de manipulação e moldagem, sem ter de dar forma prévia ao implante, adaptando-se totalmente à forma da cavidade óssea. Diversos estudos, têm mostrado que a adição de aditivos poliméricos tem uma forte influência sobre as propriedades do cimento. A baixa resistência mecânica é o principal obstáculo a uma maior utilização de CFC como material de implante. O objetivo deste trabalho foi avaliar as propriedades de um cimento com base em α-fosfato tricálcico (α -TCP ), adicionado de PVA (poli (álcool vinílico)) (10%, 8%, 6%), hidrogel de PVA (10%,8%,6%) reticulado com ácido cítrico (10%), hidrogel de alginato de sódio (2%) e poliacrilato de amônia (1%), todos em massa, foram adicionados ao pó de α -TCP sintetizado. As amostras foram moldadas e avaliadas quanto à densidade, porosidade, teste ―in vitro‖ (Simulated Body Fluid), fases cristalinas e propriedades mecânicas. Os resultados mostram o aumento das propriedades mecânicas do cimento, quando adicionado destes polímeros. A reticulação dos hidrogéis de PVA com ácido cítrico foi eficiente.O hidrogel de PVA, o hidrogel de alginato de sódio e o poliacrilato de amônia agiram como redutor de líquido.
The calcium phosphate cements (CPCs) have great interest for use in orthopedics and dentistry as replacements for damaged parts of the skeletal system, showing good biocompatibility and osseointegration, allowing its use as a bone graft. The characteristics that determine CPCs attractive biomaterials for bone remodeling or rebuilding, is ease of handling and molding, without having to shape prior to implantation, adapting itself fully to the shape of the bone cavity. Several studies in literature have shown that the addition of polymeric additives has a strong influence on the mechanical properties of cement. The low mechanical strength is the main impediment to a broader use of calcium phosphate bone cement as implant material. The aim of this work was evaluate the strength of a CPC based on α-tricalcium phosphate, with polymeric additions. CPC was synthesized and PVA (poli (vinyl alcohol)) (10%, 8%, 6%), sodium alginate hydrogel (2%) and ammonium polyacrylate (1%), all by weight, were added to the powder. Specimens were molded and evaluated for density, porosity, in vitro test (Simulated Body Fluid), crystalline phases and mechanical properties. The results show the increase of the mechanical properties of cement when added of polymeric additives. The crosslinking of PVA hydrogels with citric acid was effective. The PVA hydrogel, the hydrogel sodium alginate and ammonium polyacrylate acted as a reducing liquid.
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Santos, Rodrigo Brandão Medeiros dos. "Síntese e caracterização de pós nanoestruturados de fosfato de cálcio e nanocompósitos hidroxiapatita/sílica-gel." Universidade do Estado de Santa Catarina, 2009. http://tede.udesc.br/handle/handle/1750.

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The loss of an organ or a part of the body generates, besides the loss of function, social and psychological disorders. The materials used to replace bone fall into a class called biomaterials and should have physical and biological properties compatible with living tissue hosts. The objective of this study is to optimize the method of synthesis and characterization of a bone matrix of calcium phosphate nanostructured and nanocomposite calcium phosphate /SiO2n at concentrations of 1%, 2%, 3% and 5% by volume. Were carried out morphological characterization of nanoparticles, nanostructured mineral powders and biomaterials obtained by sintering at 1200 C/2h. Finally, studies were performed on the mechanical behavior of nanostructured biomaterials. The process of synthesis of nanostructured powders proved to be efficient and optimized, allowing to obtain the matrix of calcium phosphate and nanocomposites with silica gel. Silica gel influence the surface energy of the matrix of calcium phosphate and this phenomenon has influenced the particle size of the nanocomposites, phase transformation and sinterability of the matrix of calcium phosphate. Tests of mechanical properties showed that the increase in percentual silica gel in the phosphate matrix tends to reduce the mechanical strength (hardness, strength and fracture toughness). Only the nanocomposite with 1% silica showed improvement in mechanical properties after annealing.
A perda de um órgão ou de uma parte do corpo humano gera, além da perda da função, transtornos sociais e psicológicos. Os materiais utilizados na substituição de ossos enquadram-se em uma classe denominada de biomateriais e devem apresentar propriedades físicas e biológicas compatíveis com os tecidos vivos hospedeiros. Esse trabalho tem como objetivo otimizar o método de síntese e caracterização de uma matriz óssea de fosfato de cálcio nanoestruturada e de nanocompósitos fosfato de cálcio/SiO2n, nas concentrações de 1%, 2%, 3% e 5% em volume. Foram realizadas caracterizações morfológicas das nanopartículas, mineralógica dos pós nanoestruturados e dos biomateriais obtidos da sinterização a 1200ºC/2h. Por fim, foram realizados estudos sobre o comportamento mecânico dos biomateriais nanoestruturados. O processo de síntese de pós nanoestruturados mostrou-se eficiente e otimizado, permitindo a obtenção da matriz de fosfato de cálcio e dos nanocompósitos com sílica gel. A sílica gel influenciou na energia de superfície da matriz de fosfato de cálcio e esse fenômeno influenciou no tamanho de partícula dos nanocompósitos, transformação de fase e sinterabilidade da matriz de fosfato de cálcio. Os ensaios de propriedades mecânicas mostraram que o aumento do percentual de sílica gel na matriz de fosfato tende a reduzir a resistência mecânica (microdureza, flexão e tenacidade à fratura). Apenas o nanocompósito com 1% de sílica apresentou melhora nas propriedades mecânicas após o recozimento.
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Gittings, Jonathan Paul. "Fabrication and properties of novel open porous calcium phosphate bioceramics." Thesis, University of Bath, 2005. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421251.

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Novotná, Lenka. "Bioceramic Materials for Advanced Medical Applications." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-234578.

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Cílem disertační práce bylo připravit trojrozměrné biokeramické podpůrné systémy („skafoldy“), které by v budoucnu mohly pomoci při rekonstrukci a regeneraci poškozených kostních tkání. Porézní keramické pěny byly připraveny dvěma způsoby – replikační technikou a polymerizací in situ. Co se složení týče, byly studovány keramické materiály zejména na bázi oxidu hlinitého, zirkoničitého a kalcium fosfátů. Byl studován jednak vliv procesních parametrů jako je složení suspenzí a jejich viskozit, dále pak vliv tepelného zpracování na strukturu a výsledné vlastnosti připravených materiálů. U slinutých pěn byla pomocí rastrovací elektronové mikroskopie hodnocena zejména morfologie – velikost pórů, jejich propojenost a celková porozita, charakterizace mikrostruktury nebyla opomenuta. Dále bylo stanoveno fázové složení a pevnost v tlaku. Z biologických vlastností byla testována a diskutována bioaktivita a cytotoxicita materiálů. Disertační práce je členěna do několika částí. V literární rešerši je popsána stavba a vlastnosti kosti, požadavky kladené na kostní náhrady, výhody a nevýhody současně používaných materiálů a způsoby přípravy keramických pěn. Následuje experimentální část, kde byly nejprve studovány pěny připravené replikační technikou. Všechny takto vyrobené pěny měly propojené póry o velikostech 300 až 2000 m, celková porozita se pohybovala v rozmezí 50 – 99 %. Pevnost pěn na bázi kalcium fosfátů – 0,3 MPa (při celkové porozitě 80%) byla nedostatečná pro kostní náhrady, kde je požadována pevnost větší než 2 MPa. Kalcium fosfátové keramiky byly tedy zpevněny buďto inertním jádrem na bázi oxidu hlinitého nebo ATZ (oxidem zirkoničitým zhouževnatělým oxidem hlinitým). Dále byl přípraven částicový kompozit, ve kterým byl hydroxyapatit pojený oxidem křemičitým. Pevnost pěn se podařilo zvýšit až na více než 20 MPa. V poslední kapitole experimentální části byly studovány keramické pěny pěněné in situ, kde byly póry vytvářeny oxidem uhličitým unikajícím během reakce mezi diisokyanátem a polyalkoholem. Po vypálení polymerního pojiva měly pěny propojené póry o průměrné velikosti 80 až 550 m. Celková porozita se pohybovala v rozmezí 76 – 99%. Výhodou oproti replikační technice byly plné trámečky bez velké středové dutiny vznikající vypálením polymerní předlohy. Žádný ze studovaných materiálů nebyl pro buňky toxický, navíc všechny studované pěny vykazovaly bioaktivní chování. Z hlediska kostního tkáňového inženýrství se jako nejslibnější jeví kompozitní materiál zpevněný oxidem křemičitým.
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Bernard, Sheldon Ainsworth. "Influence of silicon dioxide, magnesium oxide and zinc oxide on resorbable tricalcium phosphate based bioceramics." Online access for everyone, 2005. http://www.dissertations.wsu.edu/Thesis/Fall2005/s%5Fbernard%5F083005.pdf.

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Книги з теми "Calcium phosphate bioceramic"

1

S, Komlev V., ed. Calcium phosphate based bioceramics for bone tissue engineering. Stafa-Zuerich, Switzerland: Trans Tech Publications, 2008.

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Komlev, V. S. (Vladimir Sergeevich), ред. Biokeramika na osnove fosfatov kalʹt︠s︡ii︠a︡: Calcium phosphate based bioceramics. Moskva: Nauka, 2005.

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Groot, K. de. Bioceramics Calcium Phosphate. Taylor & Francis Group, 2018.

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Groot, K. de. Bioceramics Calcium Phosphate. Taylor & Francis Group, 2018.

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Groot, K. de. Bioceramics Calcium Phosphate. Taylor & Francis Group, 2018.

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Groot, K. de. Bioceramics Calcium Phosphate. Taylor & Francis Group, 2018.

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Bioceramics Calcium Phosphate. Taylor & Francis Group, 2017.

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de Groot, K. Bioceramics of Calcium Phosphate. Edited by Klaas de Groot. CRC Press, 2018. http://dx.doi.org/10.1201/9781351070133.

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Barinov, Sergey V., and Vladimir S. Komlev. Calcium Phosphate Based Bioceramics for Bone Tissue Engineering. Trans Tech Publications, Limited, 2008.

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Dorozhkin, Sergey V. Hydroxyapatite and Other Calcium Orthophosphates: Bioceramics, Coatings and Dental Applications. Nova Science Publishers, Incorporated, 2017.

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Частини книг з теми "Calcium phosphate bioceramic"

1

Hesaraki, S., A. Zamanian, and M. Hafezi. "Montmorillonite-Added Calcium Phosphate Bioceramic Foams." In Bioceramics 20, 111–14. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-457-x.111.

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Duan, Ke, Yuwei Fan, and Rizhi Wang. "Electrochemical Deposition and Patterning of Calcium Phosphate Bioceramic Coating." In Ceramic Transactions Series, 53–61. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118406069.ch6.

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Aruna, S. T., and M. Shilpa. "Solution Combustion Synthesis of Calcium Phosphate-Based Bioceramic Powders for Biomedical Applications." In Nanomaterials and Their Biomedical Applications, 175–96. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6252-9_7.

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Liao, Jia-Hui, Yu-Chen Chang, and Tzer-Shin Sheu. "Preparation of Hydroxyapatite and Calcium Phosphate Bioceramic Materials from the Aqueous Solution at Room Temperature." In Advances in Bioceramics and Biocomposites II, Ceramic Engineering and Science Proceedings, Volume 27, Issue 6, 95–101. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470291351.ch9.

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Salma, I., G. Salms, A. Skagers, M. Pilmane, and L. Feldmane. "Autologous Fibrin Mixed with Biphasic Calcium Phosphate Bioceramic Granules Activates Encapsulation in Soft Tissue Environment." In IFMBE Proceedings, 178–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-34197-7_47.

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Arcos, Daniel. "Calcium Phosphate Bioceramics." In Bio-Ceramics with Clinical Applications, 23–71. Chichester, UK: John Wiley & Sons, Ltd, 2014. http://dx.doi.org/10.1002/9781118406748.ch3.

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Dorozhkin, Sergey V. "Calcium Phosphates." In Handbook of Bioceramics and Biocomposites, 91–118. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-12460-5_9.

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Dorozhkin, Sergey V. "Calcium Phosphates." In Handbook of Bioceramics and Biocomposites, 1–22. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-09230-0_9-1.

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Frayssinet, Patrick, Daniel Ciocca, and Nicole Rouquet. "Calcium Phosphate Powder for Cancer Vaccination." In Bioceramics 20, 1207–10. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-457-x.1207.

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Cave, M. R., David Farrar, and Adrian J. Wright. "Organic/Inorganic Hybrid Calcium Phosphate Biomaterials." In Bioceramics 20, 383–86. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-457-x.383.

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Тези доповідей конференцій з теми "Calcium phosphate bioceramic"

1

Mohammad, Nur Farahiyah, Muhammad Hariz Muhammed, Zulkarnay Zakaria, Azian Azamimi Abdullah, and Intan Shafinaz Mohammad. "Characterization of calcium phosphate bioceramic from Paphia undulata shells." In 2012 International Conference on Biomedical Engineering (ICoBE). IEEE, 2012. http://dx.doi.org/10.1109/icobe.2012.6178966.

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Xu, J. L., K. A. Khor, and R. Kumar. "Spheroidization of Bioceramic Powders in a Radio Frequency Plasma." In ITSC2007, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p0890.

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Abstract Inductively coupled radio frequency (RF) plasma spraying, powered by high-frequency oscillating electrical current, performed an important role in fine powder manufacture. It was used in the present study to prepare fine spherical bioceramic powders of hydroxyapatite (HA) whose chemical composition similar to those of natural bone. The as-sprayed powders consisted of both micron-sized spherical particles and nano-sized particles. In addition to the spheroidization effect, rf plasma treatment led to the decomposition of HA into secondary calcium phosphate phases including tri-calcium phosphate (TCP), tetra-calcium phosphate (TTCP) and calcium oxide (CaO). The microstructure investigation showed that the spheroidized particles were either fully dense or hollow structure with a shell. The reason for the formation of hollow spheres was contributed to the higher density of the solidifying surface layer compared with the molten phase during solidification.
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Yu Feng, Wei Li, Zhiling Yan, and Yunmao Liao. "A preliminary study on a highly porous nano calcium phosphate bioceramic scaffolds for bone tissue engineering." In 2010 IEEE 3rd International Nanoelectronics Conference (INEC). IEEE, 2010. http://dx.doi.org/10.1109/inec.2010.5425196.

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Liu, Xueran, and Ahmed R. El-Ghannam. "Effect of Processing Parameters on the Microstructure and Mechanical Behaviour of Nano Bioceramic." In ASME 2008 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2008. http://dx.doi.org/10.1115/sbc2008-193076.

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Silica-calcium phosphate nanocomposite (SCPC) has a superior bone regenerative capacity and resorbability when compared to hydroxyapatie (HA) and bioactive glass [1–2]. Synthesis of SCPC bioceramics with superior mechanical properties has been an important and challenging issue. Ideally, the mechanical strength of the orthopedic implantat should be comparable to that of the host-bone in order to provide structural support and minimize stress shielding. The compressive strength of trabecular bone ranges from 2–12 MPa and that of cortical bone varies in the range of 100–230 MPa [3]. The aim of the present study is to study the effect of processing parameters on the mechanical properties of SCPC cylinders prepared by powder metallurgy technique. The mechanical properties were correlated to the microstructure of SCPC prepared under different processing conditions.
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Qiu, Qing-Qing, Paul Ducheyne, and Portonovo S. Ayyaswamy. "Growth and Differentiation of Osteoblasts on Hollow Biocompatible Ceramic Microcarriers Under Microgravity Conditions." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0793.

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Abstract In our recent studies with osteoblasts in the simulated microgravity environment of rotating-wall vessels (RWVs), we have observed the formation of cell aggregates and glass surface layers. In those studies, surface modified bioactive glass particles were employed as microcarriers. The growth and coverage of cells on the glass microcarriers were observed to be limited. We have also studied this problem from a numerical modeling viewpoint. Our numerical analysis of the particle dynamics in RWVs has revealed that the limited coverage noted in the experiments may be attributable to both the high shear stress imparted to the particle surface and the collisions experienced by the microcarrier with the outer wall of the vessel. The high shear stress and wall collisions arise primarily as a result of the high density of the microcarrier material. Here, we report the development of novel hollow bioceramic microspheres with an apparent density in the range 0.8 ∼ 1.0 g/cm3. These microcarriers alleviate the aforementioned problems. The hollow ceramic microspheres have an inner shell with composition of 58–72% SiO2, 28–42% Al2O3 (in % by weight) and a porous calcium phosphate surface. This surface was deposited using a fine particle sedimentation method. The hollow microspheres were sintered at 800°C for 1h. FTIR analysis indicated that crystalline calcium hydroxyapatite (HA) was present in the porous surface. Particle trajectory analyses in both an inertial frame and a rotating frame have shown that these microspheres remain suspended in the RWV environment during the entire cell culture period without experiencing collisions with the outer wall of the vessel. Furthermore, the shear stress imparted on the microsphere surface is low (∼ 0.6 dyn/cm2. Our cell culture studies in the HARV employing the hollow microcarriers have shown that osteoblastic cells form 3-D aggregates. Extensive extracellular matrix and mineralization were also observed in these aggregates.
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