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In the present work, hydroxyapatite (HAp, Ca10(PO4)6(OH)2) synthesis was carried out using hydrothermal method with calcium hydroxide (Ca(OH)2) and ammonium phosphate((NH4)2HPO4) as precursors. Two different HAp powders were obtaining by varying pH by adding nitric acid (pH =9) and ammonium hydroxide (pH = 10). All the synthesis was carried out in an autoclave at 200 °C for 24 h. The obtained products...
Apatitic phosphates are considered within the category of bioceramics. HA and its derives are used of in the fields of medicine, orthopedics and dentistry in order to support a grow up of new bone cells. HA structures have a high biocompability and are widely in biomedical applications. On the other hand, synthesis of HA structures necessitates complex technologies (microwave sintering, hydrothermal...
With over 600,000 patients suffering from bone deficiencies annually in the United States, bone regeneration has come to the forefront of medical research. Current repair treatments utilize autografts (transplanting a patient's own bone from one site to another) and allografts (tissue donated from a cadaver) to treat extensive bone fractures. Although the autograft is the benchmark treatment, both...
The influence of magnesium doping on hydroxypatite represents an important research topic because of the enhancements it brings without affecting the biocompatibility. In the last decade many substances have been used for doping hydroxypatite like F, Mg, CO3, Mn, Zn, Bi, Na but each brought some disadvantages like worse mechanical properties or citotoxicity. The present study investigates the influence...
Hydroxyapatite particles were prepared by co-precipitation of calcium and phosphate solutions in the presence or absence of an emulsifier followed by physical treatments. The morphology of the particles was examined by SEM and particle size distribution was determined by Zetasizer nano-series. The particle size was also determined by SEM and TEM. The particle size distribution and morphology of the...
Anadara granosa (Ag) is a marine bivalve cockles which can be found in the tidal mudflats bordering the coastal region of many south East Asian countries particularly Malaysia, Indonesia and Thailand. This research is aim to investigate the potential of Malaysian cockle (Anadara Granosa) shell to be used as bone substitute material. Therefore, in this study two types of bioceramic has been produced...
In this study, the kinetic mecha-nisms for the hydration process of calcium phosphate cement (CPC) containing chitosan in its liquid phase were investigated by X-ray diffraction quantitative analysis. The powder component consisted of an equimolar mixture of tetracalcium phosphate and dicalcium phosphate anhydrous. The liquid component consisted of chitosan (3 wt%), citric acid (5 wt%) and glucose...
Titanium alloy with Hydroxyapatite (HA) coating is proved to have the characteristics of both bio-compatibility and mechanical strength, and is a promising material for medical implants. In this study, three layers of different HA and pure Ti mixture were coated on Titanium alloy to make a functionally graded composite material by the method of laser cladding. The material properties of the coated...
We developed a calcium phosphate cement that could be molded into any desired shape due to its chewing-gum-like consistency after mixing. The powder component of the cement consists of tricalcium phosphate (TCP). The liquid component consists of chitosan, citric acid and glucose solution. In this study, we used four groups of cement to investigate the mechanical properties and biocompatibility of...
Calcium phosphate cement (CPC) sets in situ to form hydroxyapatite and is highly promising for a wide range of clinical applications. However, its low strength limits its use to only non-stress applications, and its lack of macroporosity hinders cell infiltration, bone ingrowth and implant fixation. The aim of this study was to develop strong and macroporous CPC scaffolds by incorporating chitosan...
The thermodynamics analyse of systems of Ca-P2O5-H2O and Ca(OH)2-H3PO4-H2O in the water solution when synthesize hydroxyapatite using Sol-gel method was made. The relation figure of distributing coefficient of phosphorous acid and all the phosphorous acid radical hydroniums in the water solution and PH value and the relation figure of lg[Ca]T and PH value were drawn, and the appropriate condition...
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