Relevant bibliographies by topics / Hydroxyapatite Testing

Academic literature on the topic 'Hydroxyapatite Testing'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Hydroxyapatite Testing"

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Akbar, Achmad Fitriadi, and Sari Edi Cahyaningrum. "Characterization and Anti-Bacterial Activity Testing of the Nano Hydroxyapatite-Clove (Eugenia Caryophyllus) Against Streptococcus Mutans Bacteria." Indonesian Journal of Chemical Science 11, no. 1 (May 1, 2022): 1–8. http://dx.doi.org/10.15294/ijcs.v11i1.51037.

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Hydroxyapatite is one of the materials as a source of calcium and phosphate in the tooth remineralization process. Several studies have shown that hydroxyapatite produces strong antibacterial activity against caries-causing bacteria. Dental caries are one of the tooth scrapings suffered by many people. Dental caries are caused by Streptococcus mutans. In addition to hydroxyapatite, essential oil derived from cloves also has a good antimicrobial function. The eugenol content in cloves can kill bacteria that are resistant to antibiotics. This study aims to determine the results of the physicochemical characterization and antibacterial test of Streptococcus mutans in the clove-hydroxyapatite nanoformulation. This study used a nano-hydroxyapatite-clove test material with various compositions of 0.5 mL, 1 mL, 2 mL, 3 mL, and 4 mL of clove oil, 1% hydroxyapatite, Tween, and propylene glycol. The results of FT-IR characterization showed OH, C-H, C-O, C=O, PO43-, and CO32- functional groups. In PSA testing, the smallest size is indicated by the variation in the composition of 1ml clove oil, which is 16.07nm. The measurement of the antibacterial activity test showed that the hydroxyapatite-clove nanoformulation was able to inhibit the growth of Streptococcus mutans bacteria, with normally distributed data (p=0,05) and produce a significant probability,000 (p<0,05).
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Suciu, Oana, Liviu Bereteu, Gheorghe Drăgănescu, and Teodora Ioanovici. "Determination of the Elastic Modulus of Hydroxyapatite Doped with Magnezium through Nondestructive Testing." Advanced Materials Research 814 (September 2013): 115–22. http://dx.doi.org/10.4028/www.scientific.net/amr.814.115.

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In this paper there are presented determination methods of longitudinal elasticity modulus based on processing and analysis of vibration signals which are the results of an impulse from a small rigid ball applied on some samples of hydroxyapatite with discoid form. Hydroxyapatite is a bioactive bioceramics used, usually in implants, rods and screws covering, in order to allow human tissue to adhere to implant surface. In order to improve mechanical properties of hydroxyapatite it is doped with magnesium. This chemical element exists in normal bone tissue; it doesnt create any compatibility problem and has a stabilizing role in heat treatments stopping undesirable phase transformations.
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Gross, K. A., and C. C. Berndt. "In vitro testing of plasma-sprayed hydroxyapatite coatings." Journal of Materials Science: Materials in Medicine 5, no. 4 (April 1994): 219–24. http://dx.doi.org/10.1007/bf00121092.

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Lawarti, Riska Amelia, and Sari Edi Cahyaningrum. "Potential Antibacterial Activity of Hydroxyapatite Composite And Green Betel Leaf Extract (Piper betle L.) Against Streptococcus mutans Bacteria." Indonesian Journal of Chemical Science 11, no. 1 (May 1, 2022): 41–49. http://dx.doi.org/10.15294/ijcs.v11i1.51059.

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Dental caries is a common oral disease and the main bacteria causing it is Streptococcus mutans. Hydroxyapatite is a material consisting of calcium and phosphate components that have dual abilities as remineralizing and antibacterial agents. In addition to hydroxyapatite, phenolic compounds and tannins in green betel leaf extract also have antimicrobial functions. Tannins and phenols act as poisons for microbes by inhibiting the enzyme activity of interfering microbes. The purpose of this study was to determine the physicochemical character and antibacterial activity of Streptococcus mutans from oral hydroxyapatite preparations and green betel leaf extract. In this study, hydroxyapatite and green betel leaf extract were used as oral preparations with variations in the addition of green betel leaf extract 0.1; 0.3; 0.5; 0.7 and 1 gram. The results of the FTIR analysis explain the absorption bands of the functional groups PO43-, OH and CO32- from hydroxyapatite, as well as the C=O and C-O groups from green betel leaf extract which have shifted the wave number, indicating that there has been a bond between hydroxyapatite and metabolite compounds in betel leaf extract. green. In PSA testing, the smallest particle size was indicated by the variation of hydroxyapatite composite and 0,3 gram green betel leaf extract, which was 690.08 nm. Testing the antibacterial activity of the hydroxyapatite-green betel leaf extract composite showed inhibitory activity against Streptococcus mutans bacteri.
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Burmawi, Novesar Jamarun, Syukri Arief, and Gunawarman. "Caracterization and Compressive Strength of Biocomposite Hydroxyapatite-Borosilicate with Hight Temperature Sintering." MATEC Web of Conferences 248 (2018): 01005. http://dx.doi.org/10.1051/matecconf/201824801005.

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The use of Hydroxyapatite as bone graft material continues to increase. To utilize hydroxyapatite, it is often formed into biocomposite. The formation of hydroxyapatite biocomposite intended to address the fragile hydroxyapatite weaknesses. The added element in the formation of this biocomposite is borosilicate. Mixing of this material is arranged with certain composition using ball miling. To form a test specimen, it was printed with compacting force of 5 KN, 15 KN and 25 KN. Test results Compressive Strength.and XRD showed that addition of borosilicate did not change the compound that is hydroxyapatite, but the intensity of hydroxyapatite tends to decrease with addition of borosilicate amount, this is corroborated by FTIR testing. For visible compressive strength, the maximum value occurs at 75: 25 compositions, ie 45 MPa, 42.9 MPa and 52.3 MPa. This suggests that the addition of borosilicate in biocomposite formation does not alter hydroxyapatite compound and can generally increase the compressive strength and modulus of elasticity to 25% wt% borosilicate addition.
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Faisal, Hendri, Rida Evalina Tarigan, and Julkardo Lase. "Antibacterial Activity of Ag-Hidroxyapatite Composite of Bone-in Tuna (Thunnus albacores) Against Streptococcus mutans." JURNAL SAINS NATURAL 12, no. 2 (April 29, 2022): 78. http://dx.doi.org/10.31938/jsn.v12i2.378.

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Calcium from fish bones have not been widely used for human needs. Calcium in the medical field is used as a hydroxyapatite compound, such as in the manufacture of bones and dentures, as an additive in the manufacture of toothpaste, and usage in drug delivery. This study aims to determine whether the Ag-Hydroxyapatite composite has an inhibitory capability against Streptococcus mutans bacteria. This research is an experimental study through laboratory testing by synthesizing Ag-Hydroxyapatite from tuna fish bones (Thunnus albacores) and testing its antibacterial activity against Streptococcus mutans bacteria. The results showed that the tuna fish bone samples formed hydroxyapatite compounds and the results of the Ag-Hydroxyapatite composite had antibacterial activity against Streptococcus mutans bacteria, the statistical test results showed a significant difference from the negative control group. Ag-hydroxyapatite composite has antibacterial activity against Streptococcus mutansKeywords: Tuna (Thunnus albacores); Hydroxyapatite; Argentum; Antibacterial; Streptococcus mutans ABSTRAKUji Aktivitas Antibakteri Komposit Ag-Hidroksidaapatit dari Tulang Ikan Tuna (Thunnus albacores) terhadap Streptococcus mutansKalsium dari tulang ikan, belum banyak dimanfaatkan untuk kebutuhan manusia. Kalsium dalam dunia medis dimanfaatkan menjadi senyawa Hidroksiapatit. seperti pada pembuatan tulang dan gigi palsu, sebagai bahan tambahan dalam pembuatan pasta gigi dan juga digunakan sebagai penghantar obat. Penelitian ini bertujuan untuk mengetahui apakah komposit Ag-Hidroksiapatit memiliki daya hambat terhadap bakteri Streptococcus mutans. Penelitian ini merupakan penelitian yang bersifat eksperimental melalui pengujian laboratorium dengan mensintesis Ag-Hidroksiapatit dari tulang ikan tuna (Thunnus albacores) dan menguji aktivitas antibakteri terhadap bakteri Streptococcus mutans. Hasil penelitian menunjukan bahwa dari sampel tulang ikan tuna terbentuk senyawa Hidroksiapatit dan hasil komposit Ag-Hidroksiapatit memiliki aktifitas antibakteri terhadap bakteri Streptococcus mutans, hasil uji statistik menunjukkan adanya perbedaan signifikan terhadap kelompok kontrol negatif. Komposit Ag-hidrokiapatit memiliki aktifitas antibakteri terhadap bakteri Streptococcus mutansKeywords: Tuna (Thunnus albacores); Hydroxyapatite; Argentum; Antibacterial; Streptococcus mutans
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R., Dr Mohammed. "Assessment of shear bond strength of Polycarboxylate cement reinforced by different amounts of Hydroxyapatite." Mustansiria Dental Journal 7, no. 2 (March 19, 2018): 161–65. http://dx.doi.org/10.32828/mdj.v7i2.393.

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This study was done to assess bond strength of Polycarboxylate cement reinforcedby different amount of Hydroxyapatite. In this study a hydroxyapatite materials wereadded to Polycarboxylate cement at different ratios;10%, 15%, 20%, 25% and 30% (by weight ) and the bond strength was detected by construction a cylinders from thesemixed materials, constructed on exposed dentine of human extracted premolar teethand by Zwick’s universal testing machine the bond strength were detected for thesemixed materials. Results showed that the Polycarboxylate reinforced byhydroxyapatite has higher bond strength than conventional Polycarboxylate cementand the hydroxyapatite powder to Polycarboxylate cement powder ratio by weightbest to be 20%. The addition of hydroxyapatite to conventional Polycarboxylatecement increased its bond strength to dentine.
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Chen, P., X. Chen, Y. Wang, and P. Wang. "Preliminary study on the upcycle of non-structural construction and demolition waste for waste cleaning." Materiales de Construcción 70, no. 338 (April 15, 2020): 220. http://dx.doi.org/10.3989/mc.2020.13819.

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This study proposes a method to convert non-structural calcium-rich construction and demoli­tion waste fines into adsorbents of heavy metal ions by mixing waste fines with diammonium hydrogen phos­phate solution to produce hydroxyapatite, which has high surface areas and excellent ion-exchange capacity with heavy metal ions. As a result, environmental polluting waste is converted into environmentally cleaning material. Waste putty powders was chosen as the representative waste to investigate the detailed formation process of hydroxyapatite and the key reaction parameters of the reaction. Results showed that hydroxyapatite can be pro­duced on waste putty particles. Higher ageing temperatures or longer ageing duration are beneficial to the yield and crystallinity of the produced hydroxyapatite. Adsorption testing confirmed that Ni2+ can replace Ca2+ in the hydroxyapatite lattice, leading to the formation of a new crystal, arupite (Ni3(PO4)2•8H2O), and contributing to a modest adsorption capacity for Ni2+ (15 mg/g) for the hydroxyapatite-containing waste putty.
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Narayan, Roger J. "Hydroxyapatite/diamondlike Carbon Nanocomposites: A Novel Surface Modification to Extend Orthopaedic Prosthesis Lifetimes." Journal of Materials Research 20, no. 9 (September 2005): 2288–95. http://dx.doi.org/10.1557/jmr.2005.0284.

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Conventional plasma-sprayed hydroxyapatite coatings suffer from many difficulties that have limited their use in orthopaedic implants, including uneven resorption rates, poor fracture toughness, and poor adhesion to medical alloys. The placement of a diamondlike carbon buffer layer may overcome these obstacles by providing unique chemical inertness, hardness, and cell-interaction properties at the implant–tissue interface. Nanocrystalline hydroxyapatite and amorphous diamondlike carbon films were prepared by room-temperature pulsed-laser deposition of hydroxyapatite and graphite targets, respectively. Scanning electron microscopy, transmission electron microscopy, x-ray diffraction, and microscratch adhesion testing were used to determine surface morphology, interfacial structure, and adhesion of the bilayer coatings. Nanocrystalline hydroxyapatite/diamondlike carbon coatings have several potential orthopaedic applications, including use in hip prostheses.
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Bao, Quan He, Chao Sun, Chen Zhang, and Jie Qing Zhang. "Dip Coated Magnesium-Substituted Hydroxyapatite Coatings on Magnesium Alloy for Biomedical Applications." Journal of Biomimetics, Biomaterials and Biomedical Engineering 25 (October 2015): 83–89. http://dx.doi.org/10.4028/www.scientific.net/jbbbe.25.83.

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Magnesium-substituted hydroxyapatite coatings have been deposited on magnesium alloy for biomedical applications by sol–gel technology. The Ca(10−x)Mgx(PO4)6(OH)2 coatings obtained, with magnesium contents up to x = 1.5, show dense and compact and with visible cracks. The results of Hydrogen (H2) evolution testing in Hank’s solution show that magnesium-substituted hydroxyapatite coatings can improve the corrosion resistance of magnesium alloy.
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Dissertations / Theses on the topic "Hydroxyapatite Testing"

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Gledhill, Heather Claire. "In-vitro fatigue testing of thermally sprayed hydroxyapatite coatings." Thesis, University of Bath, 1996. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362253.

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Lye, Peter. "Surface composition of hydroxyapatite in aqueous solutions." Thesis, Queensland University of Technology, 1985.

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Quantifying the surface composition of hydroxyapatite, the structural prototype of the main inorganic constituent of bone, teeth and other calcified tissues in nature, is the first step in understanding the surface-solution equilibria of the biological solutions in contact with calcified tissue. The surface concentrations of calcium and phosphorus on hydroxyapatite in aqueous media in the pH range 5.62 to 8.19 were determined using a radioisotope exchange technique. The effect of 0.1 M KCl, 0.1 M NaCl and water on the surface composition was also determined. Trace amounts of radioactive calcium (45ca) and phosphorus (32PJ were added to aqueous hydroxyapatite suspensions at thermodynamic equilibrium following sequential washing to achieve a constant surface at any given pH. At isotopic equilibrium, the radioactive calcium and phosphorus in solution were determined by liquid scintillation counting and, with the use of appropriate isotope exchange equations, it was possible to calculate the surface concentration of calcium and phosphorus using the surface area of the solid. The surface composition varied with pH, the variation being due to the change in surface phosphorus, since the surface calcium changed little over the pH range tested. The increase in surface phosphorus concentration with decreasing pH was attributed to the effect of the surface charge on the adsorption of phosphorus from solution. The surface phosphorus concentration could be predicted from the solution pH, but the same was not true for surface calcium which was shown to be independent of pH. Using the radioisotope exchange technique~ there was no difference in the measured surface composition in 0.1 M KCl~ 0.1 M NaCl and water indicating that 0.1 M KCl and 0.1 M NaCl behave as indifferent electrolytes towards the surface of hydroxyapatite. On the basis of the measured surface composition over the pH range tested~ the surface of hydroxyapatite in aqueous solution was considered to be consistent with (1) the model of Brown (1966) which assumes that the solid is covered with a half unit cell layer of octacalcium phosphate and (2) the surface charge-dependent adsorption of ions proposed by Bell and Mika (1979).
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Parikh, Anand. "LONG-TERM CRANIAL RECONSTRUCTIONS IN FULL THICKNESS DEFECTS USING CARBONATED CALCIUM PHOSPHATE CEMENT WITH TITANIUM MESH SCAFFOLD IN A SHEEP MODEL: BIOMECHANICAL ANALYSIS." Akron, OH : University of Akron, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1164993505.

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Thesis (M.S.)--University of Akron, Dept. of Biomedical Engineering, 2006.
"December, 2006." Title from electronic thesis title page (viewed 06/27/2007) Co-Advisors, Glen O. Njus, Daniel B. Sheffer; Faculty Reader, Mary C. Verstraete; Department Chair, Daniel B. Sheffer; Dean of the College, George K. Haritos; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.
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Popa, Cristina Liana. "Caractérisation physico-chimique et ultrasonore de matériaux céramiques pour applications biomédicales." Thesis, Le Havre, 2016. http://www.theses.fr/2016LEHA0022/document.

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L’hydroxyapatite est l'un des matériaux les plus fréquemment utilisés pour le traitement des maladies des tissus durs. Le zinc est impliqué dans chaque étape du métabolisme du tissu osseux et une carence en zinc peut déterminer l'apparition de l'ostéoporose. Le dopage de l'hydroxyapatite par des ions de zinc peut créer un meilleur matériau, avec des propriétés physico-chimiques supérieures. L'objectif de cette thèse est de créer de nouveaux matériaux biocéramiques avec des propriétés spécifiques qui pourraient permettre le développement de nouvelles applications dans le domaine médical. Une attention particulière a été portée à la caractérisation des propriétés biologiques et physico-chimiques. Dans cette thèse, une nouvelle méthode non destructive de caractérisation de nanoparticules de céramique a été développée. La thèse se compose de six chapitres. Les deux premiers décrivent les biomatériaux et les techniques de caractérisation physico-chimique et ultrasonore utilisées, les trois chapitres suivants présentent des résultats expérimentaux originaux et le dernier chapitre des conclusions générales. La nouveauté de cette étude réside dans la caractérisation de matériaux biocéramiques à base d'hydroxyapatite pour de possibles applications biomédicales. Une nouvelle méthode non destructive de caractérisation par ultrasons est présentée. Ces résultats pourraient contribuer à développer une technique rapide et efficace pour la caractérisation de matériaux céramiques, qui pourrait être utilisée dans le futur en complément des techniques communément utilisées dans le domaine médical, notamment dans le domaine orthopédique
Hydroxyapatite is one of the most commonly used material used for treating hard tissue diseases. Zinc is involved in each stage of bone tissue metabolism and a lack of it may determine the onset of osteoporosis. Doping hydroxyapatite with Zn ions may cause an improvement of the hydroxyapatite properties, thus resulting a better material, with enhanced physico-chemical properties. Devices based on collagen and hydroxyapatite inhibit the development of bacterial pathogens, reducing the risk of post-surgical infections. The goal of this thesis was to create new bioceramic materials with specific properties which could allow development of new applications in the medical field. Special attention was paid to the characterization of the physico-chemical and biological properties. In this thesis are reported for the first time non-destructive, ultrasonic spectroscopy studies performed on ceramic solutions. The thesis consists of six chapters, the first two comprised of general aspects, the following three chapters present original experimental results and the last chapter presents general conclusions. The novelty of this study lies in the method of synthesis and characterization of bioceramic materials based on hydroxyapatite for possible biomedical applications. Furthermore, a new non-destructive method of characterization techniques based on ultrasounds is presented. The results presented in this study could create a premises of developing a rapid and effective technique for characterization of ceramic materials, which could be used in the future as a complementary technique widely used on different materials used in the medical field, especially in the orthopedic field
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Dalmonico, Gisele Maria Leite. "Elaboração e caracterização de biomateriais granulados microporosos de fosfatos de cálcio: teste in vivo em ovinos." Universidade do Estado de Santa Catarina, 2015. http://tede.udesc.br/handle/handle/627.

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Made available in DSpace on 2016-12-08T15:56:19Z (GMT). No. of bitstreams: 1 Gisele Dalmonico.pdf: 8818399 bytes, checksum: 54cd754bf0a330bb5a3710ceaea2c8ed (MD5) Previous issue date: 2015-11-20
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Treatments for bone loss are research topics and involve different areas of scientific knowledge, engineering, physics, chemistry, biology and biomedicine. The biomaterials that stand out as replacement in bone structure treatments are hydroxyapatite, β and α calcium phosphate, biphasic hydroxyapatite/calcium phosphate β and α and hydroxyapatite matrix nanocomposite biomaterials. These biomaterials stand out as bone substitutes because they present a crystallography similar to that of human skeleton bone apatite, being bioactive and biocompatible. Nanostructured biphasic bioceramics are researched and show potential to be bone substitutes in surgical repairing procedures and reconstruction of bone tissue. This project was developed based on research of biomaterials of calcium phosphates, involving the synthesis of two matrices of calcium phosphates: β-calcium phosphate (β-TCP) and hydroxyapatite (HA) and the preparation of microporous granular biomaterials of β-TCP, HA and biphasic compositions HA/β-TCP. All biomaterials were characterized by different techniques: X-ray diffraction, infrared spectroscopy in Fourier transform (FTIR), Raman spectroscopy, specific surface area for BET, particle size by laser diffraction, density of helium pictometria, porosimetry mercury and hydrostatic porosity by Arthur, differential scanning calorimetry, dilatometry, scanning electron microscopy, atomic force microscopy, confocal microscopy, optical microscopy, polarized light microscopy. The interest of this research was to evaluate the performance of biomaterials in in vivo tests for the time periods of 90 and 180 days, in relation to osseointegration and the formation of neoformed bone tissue and determine which biomaterials presented potential as bone replacement for biomedical applications. The results found are encouraging and demonstrate that the granulated microporous biomaterials of calcium phosphate proves to be ability to repair and bone reconstruction for the two test times in vivo evaluated, revealing the osseointegration and bone formation similar between the compositions.
Os tratamentos de perdas ósseas são temas de pesquisa que envolve diferentes áreas do conhecimento científico, engenharia, física, química, biologia e biomédica. Os biomateriais que se destacam como substitutos em tratamentos da estrutura óssea são a hidroxiapatita, os fosfatos de cálcio-β e α, os bifásicos hidroxiapatita/fosfato de cálcio-β, α e os biomateriais nanocompósitos de matriz hidroxiapatita. O destaque destes biomateriais como substitutos ósseos, se deve, por apresentarem cristalografia similar à da apatita óssea do esqueleto humano, por serem bioativos e biocompatíveis. As biocerâmicas bifásicas nanoestruturadas são pesquisadas e demonstram ser promissoras como substitutos ósseos em procedimentos cirúrgicos de reparação e reconstrução do tecido ósseo. Este projeto se desenvolveu com base na investigação de biomateriais de fosfatos de cálcio, envolvendo a síntese de duas matrizes de fosfatos de cálcio: Fosfato de cálcio-β (TCP-β) e hidroxiapatita (HA) e elaboração de biomateriais granulados microporosos de TCP-β, HA e bifásicos HA/TCP-β. Todos os biomateriais granulados foram caracterizados por diferentes técnicas: difratometria de raios X, espectroscopia de infravermelho por transformada de Fourier (FTIR), espectroscopia Raman, área superficial específica por BET, tamanho de partícula por difração a laser, densidade por pictometria de hélio, porosimetria de mercúrio e hidrostática com método de Arthur. Com relação ao comportamento térmico utilizou-se a calorimetria exploratória diferencial, dilatometria. A caracterização microestrutural foi realizada com a microscopia eletrônica de varredura, microscopia de força atômica, microscopia confocal, microscopia óptica, microscopia de luz polarizada. Esse projeto de pesquisa envolveu a elaboração de biomateriais granulados microporosos de fosfatos de cálcio, o interesse foi avaliar o desempenho destes em teste in vivo, para os tempos de 90 e 180 dias em tíbia de ovinos, em relação ao desempenho dos mesmos sobre a osseointegração e a neoformação do novo tecido ósseo. Os resultados encontrados são animadores e demonstram que todas as composições de biomateriais granulados microporos de fosfatos de cálcio, demonstraram capacidade de reparação e reconstrução óssea para os dois tempos de teste in vivo avaliados, revelando a osseointegração e a neoformação óssea semelhante entre as composições.
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Books on the topic "Hydroxyapatite Testing"

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Emanuel, Horowitz, Parr Jack E, and ASTM Committee F-4 on Medical and Surgical Materials and Devices., eds. Characterization and performance of calcium phosphate coatings for implants. Philadelphia, PA: ASTM, 1994.

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Book chapters on the topic "Hydroxyapatite Testing"

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Cao, H. D., Yan Fei Tan, Xiao Yan Lin, Hong Song Fan, and Xing Dong Zhang. "Cytocompatibility Testing of Hydroxyapatite/Collagen Composite Cross-Linked with Glutaraldehyde." In Advanced Biomaterials VI, 223–26. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-967-9.223.

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Orth, Joachim, Serena Macedo, Axel Wilke, and Peter Griss. "Osseointegration of Hydroxyapatite-Coated and Uncoated Bulk Alumina Implants in the Femur of Göttingen Minipigs Mechanical Testing of Bonding Strength." In Bioceramics and the Human Body, 302–7. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2896-4_41.

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Wilke, A., S. V. Hirschheydt, and J. Orth. "Human Bone Marrow Cell Culture-Analysis of Cell Behaviour at Biocompatibility Testing of Ceramics." In Hydroxyapatite and Related Materials, 283–87. CRC Press, 2017. http://dx.doi.org/10.1201/9780203751367-28.

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Conference papers on the topic "Hydroxyapatite Testing"

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Wei, M., A. J. Ruys, B. K. Milthorpe, and C. C. Sorrell. "MECHANICAL TESTING OF ELECTROPHORETICALLY DEPOSITED HYDROXYAPATITE." In Proceedings of the 12th International Symposium on Ceramics in Medicine. WORLD SCIENTIFIC, 1999. http://dx.doi.org/10.1142/9789814291064_0111.

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Yatongchai, Chokchai, Mark R. Towler, and Anthony W. Wren. "Processing and mechanical testing of strontium-substituted hydroxyapatite/glass composites." In 2014 40th Annual Northeast Bioengineering Conference (NEBEC). IEEE, 2014. http://dx.doi.org/10.1109/nebec.2014.6972986.

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Zhang, Qingwei, Wei Zhang, Jephte Augustin, Donggang Yao, David M. Wootton, Fredric A. Kleinbart, Norman A. Johanson, Kimberly A. Wasko, Peter I. Lelkes, and Jack G. Zhou. "Bio-Testing of Poly-L-Lactic Acid/Hydroxyapatite Porous Bone Scaffolds." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64125.

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Tissue engineering is a rapidly growing interdisciplinary field which offers a promising new technology to create artificial constructs for regeneration of tissues. One important aspect of bone tissue engineering is to build scaffolds with interconnected 3-D porous structure in order to mimic natural bone architecture. In this work, co-continuous micro-porous scaffolds made of Poly-L-lactic acid (PLLA) with 50% porosity and PLLA/hydroxyapatite (HA) with 40% porosity were prepared by injection molding of an immiscible polymer blend with polystyrene as sacrificial material. The sacrificial material was then removed by solvent leaching with cyclohexane. The porous PLLA/HA matrix supported murine osteoblast (7F2) cell growth for up to 9 days, suggesting that that the introduction and replacement of sacrificial material had no negative effects on cell proliferation. In vitro studies also indicate an increase in mineralization by osteoblasts cultured on the porous structure, as compared to cells cultured on solid scaffold. One month subcutaneous degradation tests showed a mild foreign body reaction and complete fibrous encapsulation. Following surgical implantation of the scaffolds into circular defects in canine tibia, we observed after 12 weeks new bone tissue grew into the porous structures. Taken together our data suggest that interconnected porous structures with good cytocompatibility and increased mineralization in vitro paired with enhanced osteoinductive properties in vivo suggest a great potential of the porous PLLA/HA for inducing and sustaining bone tissue repair.
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Singh, Gurpreet, Hazoor Singh, and Buta Singh Sidhu. "Characterisation and In Vitro Corrosion Resistance of Plasma-Sprayed Hydroxyapatite and Hydroxyapatite–Silicon Oxide Coatings on 316L SS." In ITSC2015, edited by A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen, and C. A. Widener. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.itsc2015p0941.

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Abstract In the current investigation plasma spray technique was used for depositing hydroxyapatite (HA) and hydroxyapatite – silicon oxide (SiO2) coatings on 316L SS substrate. In HA-SiO2 coating, 20 wt% SiO2 was mixed with HA. The feedstock and coatings were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) / energy-dispersive X-ray spectroscopy (EDX) analyses. The corrosion resistance of the uncoated, HA coated and HA + 20 wt% SiO2 coated 316L SS was investigated by electrochemical corrosion testing in simulated human body fluid (Ringer’s solution). After the corrosion testing, the samples were analyzed by XRD and SEM / EDX analyses. The addition of SiO2 reduces the crystallinity of the coating. The corrosion resistance of the 316L SS was found to increase after the deposition of the HA + 20 wt% SiO2 and HA coatings.
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Sun, L., C. C. Berndt, and K. A. Gross. "Characterization and Mechanical Properties of Flame Sprayed Hydroxyapatite/Polymer Composite Coatings." In ITSC2001, edited by Christopher C. Berndt, Khiam A. Khor, and Erich F. Lugscheider. ASM International, 2001. http://dx.doi.org/10.31399/asm.cp.itsc2001p0321.

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Abstract Hydroxyapatite/polymer composite coatings of different volume ratios were produced using a Plastic Flame Spray (PFS) system. The intent of this processing is to obtain a coating with an optimal combination of biological and mechanical properties of these two materials for skeletal implants. The composite coatings were produced with a mechanical blend of EMMA and hydroxyapatite powder from a fluidized bed powder feeder. Characterization was conducted by scanning electron microscopy on the surface morphology, polished cross-sections and fracture surface morphology of the coatings. The bioactivity of the coatings was evaluated with a calcium ion meter, and the stress-strain behavior was investigated by tensile testing. The biological and mechanical properties were found to be related to the volume and the distribution of the hydroxyapatite in the polymer matrix.
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Abir, Mirazul Mahmud, Sarita Morakul, Yuichi Otsuka, Yukio Miyashita, and Yoshiharu Mutoh. "Effects of Composition on Mechanical Properties of Suspension Plasma-Sprayed Hydroxyapatite/Titania Coating." In ITSC2019, edited by F. Azarmi, K. Balani, H. Koivuluoto, Y. Lau, H. Li, K. Shinoda, F. Toma, J. Veilleux, and C. Widener. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.itsc2019p0369.

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Abstract In this study, hydroxyapatite, titania, and HA-TiO2 composite layers are deposited by suspension plasma spraying on titanium substrates and assessed by means of SEM and XRD analysis, Raman spectroscopy, and acoustic emission testing. The coatings exhibited dense microstructures with low porosity and good interfacial bond strength. The main phase in the HA and composite coatings was found to be similar to the peak of the feedstock powder. In the composite and titania coatings, besides rutile and anatase, a significant percentage of thermally stable Ti3O5 was observed, which is favorable for photocatalytic performance.
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Wagoner Johnson, Amy J., Lucas McInstosh, and Jackie M. Cordell. "Bone Geometry in Periodic Hydroxyapatite Scaffolds Has Little Influence on Effective Elastic Properties." In ASME 2008 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2008. http://dx.doi.org/10.1115/sbc2008-193229.

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The development of bone replacement materials for large and load-bearing defects and their translation to the clinic will require extensive characterization of the mechanical properties of the scaffold/bone composites after implantation. Numerous of challenges are associated with such characterization of these types of composite. In particular, the need for large animal models, the associated cost, and the removal of the scaffolds from host bone for mechanical testing are some of the more difficult challenges to overcome. The ability to accurately predict the mechanical properties of scaffold/bone composites will lead to significant advances in the area of bone tissue engineering. Properties for periodic materials have been accurately modeled modeled using representative volume elements (RVE) [1]. The hydroxyapatite (HA) scaffolds in this study have a periodic lattice structure, making the use of an RVE appropriate for modeling effective properties. However, the choice of an appropriate RVE and geometry to represent the bone in the composite is less clear.
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Khor, K. A., Y. W. Gu, Y. Li, C. H. Quek, V. J. P. Lim, and P. Cheang. "Novel Bioactive Composites by Thermal Spray Process." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0625.

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Abstract This paper compares two types of hydroxyapatite (HA) composite coatings, HA/Ti-6Al-4V and HA/Y-ZrO2. The powders used in the study were prepared using a slurry process then deposited by plasma spraying. The resulting coatings were characterized based on their microstructure, mechanical properties, and biocompatibility. Both composite coatings performed better than pure HA coatings in tensile adhesion and indentation tests. Testing also revealed that the HA/Y-ZrO2 coatings had favorable strength and fracture toughness and that the HA/Ti-6Al-4V coatings had good affinity to living tissue and sufficient mechanical strength.
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Cottin, A., V. Guipont, B. Cauwe, and C. Demangel. "Laser Shock Adhesion Test (LASAT) Applied to Bioceramic Coatings Involving Two-Dimensional Shock Wave Propagation." In ITSC2019, edited by F. Azarmi, K. Balani, H. Koivuluoto, Y. Lau, H. Li, K. Shinoda, F. Toma, J. Veilleux, and C. Widener. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.itsc2019p0101.

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Abstract Metallic implants for orthopedic or dental use are often coated with a plasma-sprayed hydroxyapatite (HA) layer. In this study, HA coatings are applied to titanium substrates of varying thickness and laser shock adhesion tests are performed using different laser spot diameters. The objective is to investigate the effect of different shockwave regimes on interfacial debonding and the potential consequences of laser shock adhesion testing. HA coatings exhibiting different levels of adhesion were subjected to laser shock experiments and subsequently examined using nondestructive inspection techniques. The results are presented along with suggestions for developing a robust laser shock adhesion test.
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Xu, J. L., K. A. Khor, and J. Cizek. "Microstructures and Adhesive Bonding Strength Analysis of Plasma Sprayed Silica Modified Hydroxyapatite Coatings on Ti-6Al-4V substrates." In ITSC2010, edited by B. R. Marple, A. Agarwal, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. DVS Media GmbH, 2010. http://dx.doi.org/10.31399/asm.cp.itsc2010p0721.

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Abstract Hydroxyapatite (HA) is preferred for its ability to interact with living bone, resulting in improvements of implant fixation and faster bone healing. In this study, a small amount of silicon dioxide (~ 2wt%) was introduced into HA slurry which was subsequently spray-dried into powder. A silicon modified HA coating was then deposited onto Ti-6Al-4V alloy substrates by atmospheric plasma spraying technology. Scanning electron microscopy (SEM), X-ray diffraction and X-ray photoelectron spectrometry, and Raman spectrometry were employed to investigate the surface chemistry that would directly influence bone forming cell proliferation. Additionally, the adhesive bonding strength of the as-sprayed coatings were specified measured using a universal testing system. The fracture surfaces after tensile test were also investigated by SEM.
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