• V. Zarghami, M. Ghorbani, K. Pooshang Bagheri, M. A. Shokrgozar, 'In vitro bactericidal and drug release properties of vancomycin-amino surface functionalized bioactive glass nanoparticles. (sharif.edu)
  • Stable nanoparticles in the size range of 123 to 350 nm were formed at over a wide molar mixing ratios of CHI/ML solutions (amino group/phosphate group) (NH(3) (+)/PO(3) (-)) and total polyelectrolyte (PE) concentrations (0.1 to 1 wt%) except at intermediate molar ratios when the surface charge was close to neutrality. (gmp-chitosan.com)
  • The resulting amorphous mixture consists mostly of calcium and phosphate, but also contains varying amounts of water and hydrogen and hydroxide ions, depending on the synthesis conditions. (wikipedia.org)
  • Synthesis of Hybrid Polyphenol/Hydroxyapatite Nanomaterials with Anti-Radical Properties. (upmc.fr)
  • Barnes DH, Jugdaosingh R, Kiamil S, Best SM (2 011) Shelf Life and Chemical Stability of Calcium Phosphate Coatings Applied to Poly Carbonate Urethane Substrates. (omicsonline.org)
  • Despite numerous studies on the dissolution properties of calcium phosphate (CaP) coatings, the coating "shelf life" (i.e. the chemical stability of these coatings prior to implantation), has not been investigated adequately, particularly for CaP coatings applied to polymeric substrates. (omicsonline.org)
  • This paper examines the chemical stability of CaP coatings that were applied to a poly carbonate urethane (PCU) substrate by an aqueous, low temperature technique. (omicsonline.org)
  • Calcium phosphate (CaP) coatings are applied to the surface of a range of orthopaedic implants to enhance the interfacial bonding between the implant and host tissue. (omicsonline.org)
  • Hydroxyapatite and other calcium phosphate coatings have been investigated extensively for clinical applications due to their ability to form a direct bond with living bone, a property often referred to as "bioactivity" [ 2 ]. (omicsonline.org)
  • Numerous prior studies have investigated the dissolution of CaP coatings, such as hydroxyapatite, in conditions designed to simulate physiological conditions, i.e. typically at pH 7.4 and at ~37 °C [ 3 - 7 ]. (omicsonline.org)
  • 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)
  • 3D printing of drug-eluting bioactive multifunctional coatings for orthopedic applications. (pitt.edu)
  • Effects of strontium-substitution in sputter deposited calcium phosphate coatings on the rate of corrosion of magnesium alloys. (pitt.edu)
  • V. Zarghami, M. Ghorbani, K. Pooshang Bagheri, M.A. Shokrgozar, 'Prevention the formation of biofilm on orthopedic implants by melittin thin layer on chitosan/bioactive glass/vancomycin coatings', Journal of Materials Science: Materials in Medicine, 32 (2021): 75. (sharif.edu)
  • 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)
  • Six groups with different hydroxyapatite whiskers mass fractions were taken into account in order to be compared with the performances of silica particles based composites group. (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)
  • Recently, hydroxyapatite/collagen composites have received much attention in the field of tissue reconstruction, because human bone is mainly composed of hydroxyapatite and collagen fibers. (techconnect.org)
  • Hydroxyapatite-PMMA composites. (dokumen.pub)
  • Hydroxyapatite-PS composites. (dokumen.pub)
  • Calcium Phosphate Cements as Carriers of Functional Substances" Encyclopedia , https://encyclopedia.pub/entry/45418 (accessed November 29, 2023). (encyclopedia.pub)
  • Amorphous calcium phosphate (ACP) is a glassy solid that is formed from the chemical decomposition of a mixture of dissolved phosphate and calcium salts (e.g. (wikipedia.org)
  • The composition of amorphous calcium phosphate is CaxHy(PO4)z·nH2O, where n is between 3 and 4.5. (wikipedia.org)
  • A commercial preparation of ACP is casein phosphopeptide-amorphous calcium phosphate (CPP-ACP), derived from cow milk. (wikipedia.org)
  • Amorphous calcium phosphate in combination with casein phosphopeptide has been used as a dental treatment to treat incipient dental decay. (wikipedia.org)
  • Many modern orthopaedic implants are coated with calcium phosphate to improve the host tissue response to the implants. (omicsonline.org)
  • Hydroxyapatite, a type of calcium phosphate that is similar to the mineral component of bone, is the most commercially popular calcium phosphate coating for biomedical implants [ 1 ]. (omicsonline.org)
  • 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)
  • Indeed, in a study originally aimed to show that the bonding phenomenon is chemical in nature, surface topography changes in the micrometer range were observed in hydroxyapatite ceramic implants, suggesting that micromechanical interlocking contributed to the bonding mechanism [8]. (toysis.pics)
  • Calculations support the description of a cluster with central Ca2+ ion surrounded by six phosphate PO43− anions, which in turn are surrounded by eight further calcium ions. (wikipedia.org)
  • The idea behind it is that the posner molecules meld and release calcium-ions which stimulises the neurons. (wikipedia.org)
  • Bone tissue is a reservoir of calcium and phosphate ions in the form of hydroxyapatite, so it plays an important role maintaining the proper calcium levels, along with in other organs [ 5 ] [ 6 ] . (encyclopedia.pub)
  • Thus, a more durable, less soluble, and more translucent material was developed 33 , with chemical bonding to the dental substrate by the bonding of calcium ions to carboxylic radicals existing in the enamel, dentin and cementum. (bvsalud.org)
  • It is believed that ACP hydrolyzes under physiological temperatures and pH to form octacalcium phosphate as an intermediate, and then surface apatite. (wikipedia.org)
  • In aqueous media, ACP is easily transformed into crystalline phases such as octacalcium phosphate and apatite due to the growing of microcrystallites. (wikipedia.org)
  • For this reason, in the recent five years hydroxyapatite particles and whiskers have been added as novel bioactive and biocompatible reinforcing filler in dental restorations. (hindawi.com)
  • Calcium sulfate is highly biocompatible and, since it is entirely replaced by bone, is biodegradable, having the ability to promote bone formation. (bauersmiles.com)
  • Ideally, a scaffold must be porous, bioactive, and biodegradable and possess adequate mechanical properties suited to the biological site. (hindawi.com)
  • This early-stage formation of brushite has not been reported in previous studies of converting bioactive silicate and borate glasses in aqueous phosphate solution. (mst.edu)
  • Hydroxyapatite-chitosan/gelatin (HA:Chi:Gel) nanocomposite scaffold has potential to serve as a template matrix to regenerate extra cellular matrix of human bone. (csircentral.net)
  • Scaffolds with varying composition of hydroxyapatite, chitosan, and gelatin were prepared using lyophilization technique where glutaraldehyde (GTA) acted as a cross-linking agent for biopolymers. (csircentral.net)
  • First, phase pure hydroxyapatite-chitosan nanocrystals were in situ synthesized by coprecipitation method using a solution of 2% acetic acid dissolved chitosan and aqueous solution of calcium nitrate tetrahydrate Ca(NO3)(2),4H(2)O] and diammonium hydrogen phosphate (NH4)(2)H PO4]. (csircentral.net)
  • V. Zarghami, M. Ghorbani, K. Pooshang Bagheri, M. A. Shokrgozar, 'Prolongation of bactericidal efficiency of chitosan - Bioactive glass coating by drug controlled release. (sharif.edu)
  • Overall, such nanocomposite hydrogels with engineered non-covalent interactions could enable smart multiresponsive and multifunctional devices for aqueous and marine environments. (regenerativemedicine.net)
  • Data obtained show better interfacial interaction with filler/matrix until 20 wt% of hydroxyapatite whiskers partially replaced silica particles filler. (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)
  • In particular, six different ratios of hydroxyapatite/silica particles were investigated. (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)
  • Studies have shown that it does form a remineralized phase of hydroxyapatite consistent with the natural enamel. (wikipedia.org)
  • For IC, the dentin layer was removed, leaving the enamel that was crushed, and autoclaved for chemical quantification (calcium, fluorine, and phosphorus). (thejcdp.com)
  • Prevention of enamel demineralization after tooth bleaching by bioactive glass incorporated into toothpaste. (thejcdp.com)
  • Effects of bleaching agents containing fluoride and calcium on human enamel. (thejcdp.com)
  • As the main biomineral component in enamel and dentine, hydroxyapatite is responsible for their higher mechanical performances. (hindawi.com)
  • Early Stages of Calcium Phosphate Formation on Bioactive Borosilicate " by Yadong Li, B. Sonny Bal et al. (mst.edu)
  • Early Stages of Calcium Phosphate Formation on Bioactive Borosilicate Glass in Aqueous Phosphate Solution," Journal of the American Ceramic Society , John Wiley & Sons, May 2008. (mst.edu)
  • After this threshold, the mechanical performances decrease dramatically due to both the hydroxyapatite agglomerates formation and the low degree of resin conversion. (hindawi.com)
  • In addition, hydroxyapatite whiskers (wHA) have been considered the best option as reinforcing filler in comparison with other whiskers based on carbon, ceramic, glass, metal, and polymer due to the absence of cytotoxicity effects [ 12 , 13 ]. (hindawi.com)
  • Interest in calcium phosphate cements as materials for the restoration and treatment of bone tissue defects is still high. (encyclopedia.pub)
  • Calcium phosphate cements are similar in composition to the mineral component of bone tissue. (encyclopedia.pub)
  • The functionalization of calcium phosphate cements is of great clinical interest for the treatment or prevention of various diseases of bone tissue. (encyclopedia.pub)
  • Unfolded phosphopeptides are believed to sequester ACP nanoclusters and form stable complexes in other biofluids such as urine and blood serum, preventing deposition of insoluble calcium phosphates and calcification of soft tissue. (wikipedia.org)
  • It has been demonstrated that ACP has better osteoconductivity and biodegradability than tricalcium phosphate and hydroxyapatite in vivo. (wikipedia.org)
  • Méthodologie expérimentale : plans statistiques d'expérience, en particulier dans le domaine des biomatériaux (planification d'expériences in vitro et in vivo). (epfl.ch)
  • Following investigations into the composition of amorphous calcium phosphates precipitated under different conditions, Posner and Betts suggested in the mid-1970s that the structural unit of ACP was a neutral cluster Ca9(PO4)6. (wikipedia.org)
  • The conversion of bioactive glass to a calcium phosphate material, typically hydroxyapatite (HA), by solution-precipitation reactions in aqueous phosphate solution, has been commonly reported. (mst.edu)
  • At present the most frequent choice of ionic crosslinker is Calcium Chloride (CaCl 2 ) as it typically leads to rapid gelation due to its high solubility in aqueous solutions 21 . (nature.com)
  • Why ( and how ) did researchers of the previous century use blood plasma-like synthetic biomineralization solutions , instead of distilled or deionized water, to synthesize biomimetic calcium phosphates? (cuneyttas.com)
  • How to synthesize calcium phosphates in biomimetic saline solutions, over the pH range of 9 to 12.5 , without adding any strong base such as NH 4 OH, NaOH or KOH? (cuneyttas.com)
  • The immunosensor provided a new alternative to the application of other antigens or other bioactive molecules. (gmp-chitosan.com)
  • This paper describes the structural and compositional characteristics of the calcium phosphate material formed during the early-stage conversion (o5 h) of a borosilicate glass (designated H12) in aqueous phosphate solution. (mst.edu)
  • The idea behind the development of biphasic calcium sulfate was to avoid adding any additives, polymers, or accelerators in order not to change or interfere with the purity of the material and its efficient and known clinical characteristics. (bauersmiles.com)
  • In this review, we focus on the bioactive and mechanical characteristics that natural hydrogels may possess to allow efficient production of organs and tissues for biomedical applications, emphasizing the reinforcement techniques to improve their biomechanical properties. (preprints.org)
  • Bioactive Synthetic Polymer-Based Polyelectrolyte LbL Coating Assembly on Surface Treated AZ31-Mg Alloys. (pitt.edu)
  • Precipitation from a moderately supersaturated and basic solution of a magnesium salt produces amorphous magnesium calcium phosphate (AMCP), in which magnesium incorporated into the ACP structure. (wikipedia.org)
  • ICP-OES was used to measure the calcium and phosphorus concentrations of the immersion solution. (omicsonline.org)
  • Calcium sulfate hemihydrate transforms into dihydrate when it encounters water or aqueous solution, forming a solid mass in a process called setting. (bauersmiles.com)
  • Calcium sulphate (CaSO 4 ) and calcium carbonate (CaCO 3 ) are the other two popular choices of crosslinkers, however due to their lower solubility within an aqueous solution the gelation time is slower. (nature.com)
  • Thermochimie des solutions aqueuses: calculs de solubilité de composés inorganiques (phosphates, carbonates, oxalates. (epfl.ch)
  • Despite commercialization and use in the clinic, the calcium phosphate cements have great potential for development. (encyclopedia.pub)
  • This transformation is reversible, with gypsum or calcium sulfate hemihydrate forming anhydrite by heating to ~200°C under normal atmospheric conditions.The hemihydrate phase has two different forms, alpha and beta, that differ by their crystalline structure and their hardness. (bauersmiles.com)
  • Thus the defect will always be implanted with the calcium dihydrate form during the post-setting phase. (bauersmiles.com)
  • 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)
  • BondBone® is a pure calcium sulfate composed of the two phases, hemihydrate and dehydrate, in a granulated powder form. (bauersmiles.com)