Hydroxyapatite composition

Tricalcium phosphate, Ca2(P0 2> is formed under high temperatures and is unstable toward reaction with moisture below 100°C. The high temperature mineral whidockite [64418-26-4] although often described as P-tricalcium phosphate, is not pure. Whidockite contains small amounts of iron and magnesium. Commercial tricalcium phosphate prepared by the reaction of phosphoric acid and a hydrated lime slurry consists of amorphous or poody crystalline basic calcium phosphates close to the hydroxyapatite composition and has a Ca/P ratio of approximately 3 2. Because this mole ratio can vary widely (1.3—2.0), free lime, calcium hydroxide, and dicalcium phosphate may be present in variable proportion. The highly insoluble basic calcium phosphates precipitate as fine particles, mosdy less than a few micrometers in diameter. The surface area of precipitated hydroxyapatite is approximately... [Pg.334]

Results are different when solutions are used instead of suspensions. Chitosan-hydroxyapatite composites with a homogeneous nanostructure have been prepared by a coprecipitation method by Yamaguchi et al. [170]. [Pg.172]

Antibiotic-loaded composites of poly(DL-lactic acid) and hydroxyapatite have been studied as a filler in the repair of bone defects (106). The drug dideoxykanamycin was formulated at 20% by weight in a 50 50 PL A/hydroxyapatite composite. Cyclindrical composites were implanted into the penetrated tibeas of rats. Antibiotic was present at the implantation site at least 8 weeks postimplantation. [Pg.23]

Lopes, M. A., Monteiro, E J., Santos, J. D., Serro, A. P, and Saramago, B., Hydrophobic-ity, surface tension, and zeta potential measurements of glass-reinforced hydroxyapatite composites. /. Biomed. Mater. Res. 45 (4), 370-375 (1999). [Pg.163]

Sachlos E, Wahl DA, Triffitt JT, Czernuszka JT. (2008) The impact of critical point drying with liquid carbon dioxide on collagen-hydroxyapatite composite scaffolds. Acta Biomater 4(5) 1322-1331. [Pg.18]

L. (2014) Fabrication, characterization and in.vitro evaluation of nanostructured zirconia/hydroxyapatite composite films on zirconium. Surf. Coat. Technol., 238, 58-67. [Pg.246]

R. (2014) Dip coating of poly(e-caprolactone)/hydroxyapatite composite coating on Ti6A14V for enhanced corrosion protection. Surf. Coat. Technol., 245, 102-107. [Pg.251]

Milella, E., Cosentino, F., Licciulli, A., and Massaro, C. (2001) Preparation and characterisation of titania/hydroxyapatite composite coatings obtained by sol-gel... [Pg.305]

Multiwall carbon nanotube (MWCNT)-reinforced hydroxyapatite composite coatings (80% HAp/20% MWCNT) were deposited on austenitic stainless steel AISI 316L by laser surface alloying (LSA) with a 2.5-kW CW Nd YAG laser (Kwok, 2007). EIS of unprotected AISI 316L and HAp/MWCNT-coated steel obtained at open circuit potential are shown in Figure 7.60 after immersion in 0.9% NaCl solution for 2 h. The Bode plot shows that the total impedance Z has noticeably increased for the steel substrate coated with HAp/MWCNT. While the thin passive oxide film on the stainless steel surface was rendered less protective... [Pg.391]

H. Dasarathy, Development of Metal—Hydroxyapatite Composite Surface Coatings, Ph.D. dissertation, University of Alabama in Huntsville, 1994. [Pg.309]

Madhumathl K, Shalumon KT et al (2009) Wet chemical synthesis of chitosan hydrogel-hydroxyapatite composite membranes for tissue engineering applications. Int J Biol Macromol 45 12-15... [Pg.41]

Kong L, Gao Y, Lu G et al (2006) A study on the bioactivity of chitosan/nano-hydroxyapatite composite scaffolds for bone tissue engineering. Eur Polym J 42 3171-3179... [Pg.76]

Redepenning J et al (2003) Electrochemical preparation of chltosan/hydroxyapatite composite coatings on titanium substrates. J Biomed Mater Res A 66(2) 411 16... [Pg.163]

Venkatesan, J., Qian,Z.-J., Ryu, B., Ashok Kumar, N., and Kim, S.-K. (2011a). Preparation and characterization of carbon nanotube-grafted-chitosan— Natural hydroxyapatite composite for bone tissue engineering. Carbohydr. Polym. 83,569-577. [Pg.427]

Nukavarapu, S.R Kumbar, S.G. Brown, J.L. Krogman, N.R. Weikel, A.L. Hindenlang, M.D. Nair, L.S. Allcock, H.R. Laurencin, C.T. Polyphosphazene/nano-hydroxyapatite composite microsphere scaffolds for bone tissue engineering. Biomacromolecules 2008, 9 (7), 1818-1825. [Pg.612]

Rizzi, S. C., Heath, D. J., Coombes, A. G., Bock, N., Textor, M., Downes, S. Biodegradable polymer/ hydroxyapatite composites Surface analysis and initial attachment of human osteoblasts. Journal of Biomedical Materials Research. 2001, 55,475-486. [Pg.931]

M. Saito, A. Maruoka, T. Mori, N. Sugano, K. Hino, Experimental studies on a new bioactive bone cement hydroxyapatite composite resin. Biomaterials 15 (1994) 156-160. [Pg.281]

H.J. Qiu, J. Yang, P. Kodali, J. Koh, G.A. Ameer, A dtric acid-based hydroxyapatite composite for orthopedic implants. Biomaterials 27 (2006) 5845-5854. [Pg.281]

J.A. Hunt, J.T. Callaghan, Polymer-hydroxyapatite composite versus polymer interference screws in anterior cruciate ligament reconstruction in a large animal model. Knee Surg. Sports Traumatol. Arthrosc. 16 (2008) 655-660. [Pg.285]

Yang, W., Zhang, L., Wu, L., Li, J., Wang, J., Jiang, H., Li, Y. Synthesis and characterization of MMA-NaAlg/hydroxyapatite composite and the interface analyse with molecular dynamics. Carbohydr. Polym. 77, 331-337 (2009)... [Pg.248]

H. Balakrishnan, M.R. Husin, M.U. Wahit, M.R. Abdul, Kadir. Maleated high density polyethylene compatibilized high density polyethylene/hydroxyapatite composites for biomedical applications properties and characterization. Polym.-Plast. Technol. Eng. 52, 774-782 (2013)... [Pg.264]

Hydroxyapatite composites HAp with agarose gel Orthopedic, oral, maxillofacial surgery Watanabeeta/. (2007)... [Pg.160]

Hyon, S.H., Jamshidi, K., Ikada, Y. et al (1985) Bone Filler from Polydactic acid)-Hydroxyapatite Composites. Kobunshi Ronbunshu, 42,771-776. [Pg.236]

T Ikada, Y., Hyon, S.H., and Jamshidi, K. (1986) Polymer-hydroxyapatite composites for biodegradable bone fillers. Biomaterials, 7 (3), 183—187. [Pg.336]

The chitosan + hydroxyapatite composite was also prepared in the form of membranes by coprecipitation, filtration, and freeze-drying. Needle-like hydroxyapatite nanocrystals with low... [Pg.227]

Teng, SH., Lee, EJ., Yoon, BH., Shin, DS., Kim, HE., Oh, JS. 2009. Chitosan/nano-hydroxyapatite composite membranes via dynamic filtration for guided bone regeneration. Journal of Biomedical Materials Research 88A 569-580. [Pg.238]

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