• The presence of ZnO in the beta-Ca-3(PO4)(2) matrix yields denser microstructures and thus improves the mechanical features of sintered composites up to an optimal ZnO concentration beyond which it tends to exert an opposite effect. (ua.pt)
  • Crystalline tricalcium phosphate can be obtained by calcining the precipitate. (wikipedia.org)
  • Hydroxyapatite (HAP) as the most thermally stable crystalline phase of CaP is mostly used in the form of ceramics or composites scaffolds with polymers. (encyclopedia.pub)
  • Hydroxyapatite (HAP, Ca 10 (PO 4 ) 6 (OH) 2 ) has a hexagonal prismatic structure that exposes two crystalline surfaces: prism-faceted a- and basal-faceted c-surfaces. (osti.gov)
  • article{osti_1543698, title = {Effects of Controlled Crystalline Surface of Hydroxyapatite on Methane Oxidation Reactions}, author = {Oh, Su Cheun and Xu, Jiayi and Tran, Dat T. and Liu, Bin and Liu, Dongxia}, abstractNote = {Hydroxyapatite (HAP, Ca10(PO4)6(OH)2) has a hexagonal prismatic structure that exposes two crystalline surfaces: prism-faceted a- and basal-faceted c-surfaces. (osti.gov)
  • Hydroxyapatite (HAp) coatings with and without octacalcium phosphate (OCP) were uniformly formed on pure magnesium by a hydrothermal treatment using a Ca-EDTA solution. (elsevierpure.com)
  • It was demonstrated that the crystal phase and microstructure of the calcium phosphate-coatings can vary with the pH of the treatment solution. (elsevierpure.com)
  • It is revealed that the degree of protection afforded by calcium phosphate-coatings varies with their crystal phase and microstructure. (elsevierpure.com)
  • This paper discusses the processes of grit-blasting, plasma spraying, acid-etching, anodization and implant surface coatings with hydroxyapatite. (com.pk)
  • Ahmed F, Rashid H, Farookhi S, Verma V, Mulyar Y, Khalifa M, Sheikh Z. Surface modifications of endosseous dental implants by incorporation of roughness and hydroxyapatite coatings. (com.pk)
  • Effects of strontium-substitution in sputter deposited calcium phosphate coatings on the rate of corrosion of magnesium alloys. (pitt.edu)
  • Biphasic calcium phosphate, BCP, was originally reported as tricalcium phosphate, but X-Ray diffraction techniques showed that the material was an intimate mixture of two phases, hydroxyapatite (HA) and β-tricalcium phosphate. (wikipedia.org)
  • An example is: Ca10−δ(PO4)6−δ(HPO4)δ(OH)2−δ → (1−δ) Ca10(PO4)6(OH)2 + 3δ Ca3(PO4)2 β-TCP can contain impurities, for example calcium pyrophosphate, CaP2O7 and apatite. (wikipedia.org)
  • It is also known as tribasic calcium phosphate and bone phosphate of lime (BPL). (wikipedia.org)
  • Calcium phosphate is one of the main combustion products of bone (see bone ash). (wikipedia.org)
  • Calcium phosphate (CaP)-based biomaterials have superior properties and have been widely used for bone defect repair, due to their similarities to the inorganic components of human bones. (encyclopedia.pub)
  • 11 Calcium phosphate-coated implants have been described in the literature which demonstrate early direct bone attachment to the hydroxyapatite surface and this occursas quickly as one month post-operatively. (com.pk)
  • Synthesis of Hybrid Polyphenol/Hydroxyapatite Nanomaterials with Anti-Radical Properties. (upmc.fr)
  • The precipitate will either be "amorphous tricalcium phosphate", ATCP, or calcium deficient hydroxyapatite, CDHA, Ca9(HPO4)(PO4)5(OH), (note CDHA is sometimes termed apatitic calcium triphosphate). (wikipedia.org)
  • Application of 50% ortho phosphoric acid for 60 seconds to enamel surface results in formation of a mono calcium phosphate monohydrate precipitate that can be rinsed off. (onlinedentallearning.in)
  • Porous yet dense matrices: using ice to shape collagen 3D cell culture systems with increased physiological relevance. (upmc.fr)
  • KEYNOTE] Jahn S.*: First-principles molecular dynamics simulations of aqueous fluids at high temperatures and pressures. (geoscienze.org)
  • Calcium phosphate is also commonly derived from inorganic sources such as mineral rock. (wikipedia.org)
  • In particular, six different ratios of hydroxyapatite/silica particles were investigated. (hindawi.com)
  • As the main biomineral component in enamel and dentine, hydroxyapatite is responsible for their higher mechanical performances. (hindawi.com)
  • Typically double decomposition reactions are employed, involving a soluble phosphate and calcium salts, e.g. (wikipedia.org)
  • Chemical Properties of Calcium Phosphate" Encyclopedia , https://encyclopedia.pub/entry/31249 (accessed December 02, 2023). (encyclopedia.pub)
  • Hydroxyapatite: Structure and properties. (dokumen.pub)
  • A systematic evaluation of mechanical and biocompatibility properties of different volume fractions of hydroxyapatite whiskers in comparison with three commercial dental composites filled with micro- and nanosilica particles was carried out. (hindawi.com)
  • With this aim, different mass fraction of hydroxyapatite based composites and three commercial composites loaded with silica particles were tested and compared in order to verify the effective enhancement in both biocompatibility and mechanical properties. (hindawi.com)
  • β-Tricalcium phosphate has a crystallographic density of 3.066 g cm−3 while the high temperature forms are less dense, α-tricalcium phosphate has a density of 2.866 g cm−3 and α′-tricalcium phosphate has a density of 2.702 g cm−3 All forms have complex structures consisting of tetrahedral phosphate centers linked through oxygen to the calcium ions. (wikipedia.org)
  • Hydroxyapatite-collagen nanocomposites. (dokumen.pub)
  • Anisotropic dense collagen hydrogels with two ranges of porosity to mimic the skeletal muscle extracellular matrix. (upmc.fr)
  • Generation of an Adequate Perfusion Network within Dense Collagen Hydrogels Using Thermoplastic Polymers as Sacrificial Matrix to Promote Cell Viability. (upmc.fr)
  • Re-wetting done with water or aqueous re-wetting agents will cause the collapsed collagen network to raise and restore its spatial configuration. (onlinedentallearning.in)
  • After this threshold, the mechanical performances decrease dramatically due to both the hydroxyapatite agglomerates formation and the low degree of resin conversion. (hindawi.com)
  • Data obtained show better interfacial interaction with filler/matrix until 20 wt% of hydroxyapatite whiskers partially replaced silica particles filler. (hindawi.com)
  • In fact, it was shown that the incorporation of hydroxyapatite with whiskers morphology can provide larger load transfer and favor toughening mechanisms, thus, increasing flexural modulus and fracture toughness of resins in comparison with conventional silica based fillers [ 6 - 11 ]. (hindawi.com)
  • To overcome the present lack in the literature about hydroxyapatite based composite, we proposed a systematic analysis of the mechanical and biocompatibility performances of them in comparison with commercial dental composite. (hindawi.com)
  • This information is of primary interest in order to achieve a final consistency and specific formulation of hydroxyapatite whiskers mixed with silica particles filler in resin composite. (hindawi.com)
  • Calcium phosphate refers to numerous materials consisting of calcium ions (Ca2+) together with orthophosphates (PO3− 4), metaphosphates or pyrophosphates (P 2O4− 7) and occasionally oxide and hydroxide ions. (wikipedia.org)
  • It cannot be precipitated directly from aqueous solution. (wikipedia.org)
  • In a weak acid treatment solution, a dual-layer structure was formed: an outer coarse layer consisting of plate-like OCP crystals and an inner dense layer consisting primarily of HAp crystals. (elsevierpure.com)
  • Most commercial samples of "tricalcium phosphate" are in fact hydroxyapatite. (wikipedia.org)
  • Overall, such nanocomposite hydrogels with engineered non-covalent interactions could enable smart multiresponsive and multifunctional devices for aqueous and marine environments. (regenerativemedicine.net)
  • Composites with varied proportions of beta-Ca-3(PO4)(2) and ZnO were obtained through an in situ aqueous precipitation method under slightly basic (pH approximate to 8) conditions. (ua.pt)
  • Aqueous tape-cast slurries of hydroxyapatite with a solid loading of 32 vol% were prepared from various fractions of aggregated (mean particle size 4.7 - 5.6 μm) and dispersed powder (mean particle size 0.17 - 0.29 μm). (ceramic-science.com)
  • In addition, biocompatibility test showed less cytotoxic effect with the addition of 20 wt% of hydroxyapatite in comparison with higher rates. (hindawi.com)