Hydroxyapatites
Hydroxyapatite-coated femoral stems. Histology and histomorphometry around five components retrieved at post mortem. (1/747)
We performed a histological and histomorphometric examination in five cadaver specimens of the femoral and acetabular components and the associated tissue which had been recovered between 3.3 and 6.2 years after primary total hip arthroplasty (THA) using a proximal hydroxyapatite (HA)-coated titanium alloy implant. All had functioned well during the patients' life. All the stems were fixed in the femur and showed osseointegration of both the proximal and distal parts. The amount of residual HA was greatest in the distal metaphyseal sections, indicating that the rate of bone remodelling may be the main factor causing loss of HA. The level of activity of the patient was the only clinical factor which correlated with loss of coating. The percentage of bone-implant osseointegration was almost constant, regardless of the amount of HA residue, periprosthetic bone density or the time of implantation. HA debris was seldom observed and if present did not cause any adverse or inflammatory reaction. Partial debonding did occur in one case as a result of a polyethylene-induced inflammatory reaction. (+info)Changes in articular synovial lining volume measured by magnetic resonance in a randomized, double-blind, controlled trial of intra-articular samarium-153 particulate hydroxyapatite for chronic knee synovitis. (2/747)
OBJECTIVE: Magnetic resonance techniques have recently been investigated as tools with which to monitor inflammatory joint disease. Our aim was to use a contrast-enhanced T1-weighted protocol to monitor the short-term changes in knee synovial lining volume in a double-blind, randomized, controlled trial of intra-articular samarium-153 particulate hydroxyapatite (Sm-153 PHYP). METHODS: Twenty-four out-patients with chronic knee synovitis, from a cohort who had been recruited to a long-term clinical efficacy trial, were recruited for this study. Patients received either intra-articular Sm-153 PHYP combined with 40 mg triamcinolone hexacetonide or 40 mg intra-articular triamcinolone hexacetonide alone. Synovial lining volumes were calculated from three-dimensional T1-weighted contrast-enhanced images made before and after contrast enhancement with thresholding and pixel counting, immediately before and 3 months after treatment. RESULTS: Paired pre- and post-treatment magnetic resonance data were obtained for 18/24 (75%) patients. There was no significant difference in mean pre-treatment synovial volume between the two treatment groups (139 vs 127 ml). A mean reduction in synovial lining volume was detected in the Sm-153 PHYP/steroid-treated group (139 to 110 ml, P = 0.07) and in the steroid-treated group (127 to 58 ml, P < 0.001). The reduction was significantly greater in the steroid-treated group (-61% vs -23%, P < 0.05). CONCLUSIONS: Short-term changes in articular synovial lining in response to intra-articular treatment for chronic synovitis may be monitored by magnetic resonance imaging. After 3 months, a greater mean reduction in synovial lining volume had occurred in response to intra-articular steroid alone compared to combined Sm-153 PHYP/steroid injection. (+info)Chromosomal analysis of peripheral lymphocytes of patients before and after radiation synovectomy with samarium-153 particulate hydroxyapatite. (3/747)
OBJECTIVE: Radiation synovectomy may be indicated for the treatment of chronic synovitis. A number of factors may affect its current use, including availability, limited evidence for its efficacy compared to intra-articular glucocorticoid, and concerns regarding the potential long-term effects of radiation exposure, particularly in younger patients. Specific chromosome-type abnormalities in peripheral lymphocytes can be useful indicators of whole-body radiation exposure. The frequency of these aberrations has been shown to increase in patients who have had radiation synovectomy using yttrium-90 by up to five times compared to baseline levels. Samarium-153 particulate hydroxyapatite (Sm-153 PHYP) is a new radiopharmaceutical currently on trial which appears to have less extra-articular leakage than yttrium-90 compounds. The aim of this study was to identify any increase in specific chromosome-type abnormalities, using published criteria, in patients following Sm-153 PHYP synovectomy of the knee. The 10 patients (five men, five women) in whom the analyses were performed had a mean age of 47 yr (range 28-70 yr). RESULTS: There was no increase in scored chromosome-type abnormalities after Sm-153 PHYP synovectomy. CONCLUSION: This study further supports the relative safety of Sm-153 PHYP compared to other radiopharmaceuticals. (+info)Double blind glucocorticoid controlled trial of samarium-153 particulate hydroxyapatite radiation synovectomy for chronic knee synovitis. (4/747)
BACKGROUND: Samarium-153 particulate hydroxyapatite (Sm-153 PHYP) is a relatively new radiation synovectomy agent developed for the treatment of chronic synovitis. Although it has been shown that the levels of unwanted extra-articular radiation are lower after intra-articular injection of Sm-153 PHYP than yttrium-90 colloid, its clinical efficacy has not been rigorously studied. OBJECTIVES: To establish whether Sm-153 PHYP radiation synovectomy results in a clinically useful benefit sustained at one year. METHODS: In a randomised double blind study, patients received either intra-articular 40 mg triamcinolone hexacetonide alone or 40 mg triamcinolone hexacetonide combined with Sm-153 PHYP in an outpatient clinic. RESULTS: Sixty patients (28 male, 32 female), median age 51 (18-75) with chronic knee synovitis were studied. Diagnoses included: rheumatoid arthritis (n=29); psoriatic arthritis (n=9); ankylosing spondylitis (n=3); reactive arthritis (n=2); undifferentiated seronegative oligoarthritis (n=13) and miscellaneous inflammatory conditions (n=4). More patients who received Sm-153 PHYP/triamcinolone hexacetonide sustained clinical benefit a year after treatment compared with patients who received corticosteroid alone (12 of 31 (39%) v 6 of 29 (21%), a difference of 18% more patients (95% CI -5% to 41%)) though the difference was not significant (chi(2)=2.31, 0.2>p>0.1, n=60). Despite the variation in injected activity (median 563 MBq, range 218-840 MBq), there was no obvious relation between low levels of injected activity (<555 MBq) and relapse within 12 months of treatment (chi(2) =2.61, 0.2>p>0.1, n=31). CONCLUSIONS: There was no clear beneficial clinical effect of combined Sm-153 PHYP/triamcinolone hexacetonide injection over triamcinolone hexacetonide alone a year after treatment for chronic knee synovitis. (+info)Polyethylene wear, osteolysis and acetabular loosening with an HA-coated hip prosthesis. A follow-up of 94 consecutive arthroplasties. (5/747)
We have followed up for a period of seven to nine years 100 consecutive arthroplasties of the hip in which an entirely HA-coated implant had been used. The clinical results were excellent and bony incorporation was extensive in all components. No stem became loose or subsided but five cups were revised because of loosening after 3.8 to 5.5 years, having functioned painlessly and shown radiological ingrowth. Revision procedures because of excessive polyethylene wear have been performed on 18 hips and are planned for six more. Two eroded metal backings with worn-through polyethylene were exchanged; six hips showed metallosis without polyethylene wear-through. There were two cases of granulomatous cysts in the groin and 66 hips had osteolysis located periarticularly, in the greater trochanter or in the acetabulum. (+info)The effect of hydroxyapatite coating on the bonding of bone to titanium implants in the femora of ovariectomised rats. (6/747)
We have studied the effect of hydroxyapatite (HA) coating in 15 ovariectomised and 15 normal rats which had had a sham procedure. Twenty-four weeks after operation, HA-coated implants were inserted into the intramedullary canal of the right femur and uncoated implants into the left femur. The prostheses were removed four weeks after implantation. Twelve specimens in each group had mechanical push-out tests. Sagittal sections of the other three were evaluated by SEM. The bone mineral density (BMD) of the dissected left tibia was measured by dual-energy x-ray absorptiometry. The difference in BMD between the control and ovariectomised tibiae was 35.01 mg/cm2 (95% CI, 26.60 to 43.42). The push-out strength of the HA-coated implants was higher than that of the uncoated implants in both groups (p < 0.0001), but the HA-coated implants of the ovariectomised group had a reduction in push-out strength of 40.3% compared with the control group (p < 0.0001). Our findings suggest that HA-coated implants may improve the fixation of a cementless total hip prosthesis but that the presence of osteoporosis may limit the magnitude of this benefit. (+info)The influence of crystallinity of the hydroxyapatite coating on the fixation of implants. Mechanical and histomorphometric results. (7/747)
We inserted two hydroxyapatite (HA)-coated implants with crystallinities of either 50% (HA-50%) or 75% (HA-75%) bilaterally into the medial femoral condyles of the knees of 16 dogs. The implants were allocated to two groups with implantation periods of 16 and 32 weeks. They were weight-bearing and subjected to controlled micromovement of 250 microm during each gait cycle. After 16 weeks, mechanical fixation of the HA-50% implants was increased threefold as compared with the HA-75% implants. After 32 weeks there was no difference between HA-50% and HA-75%. Fixation of HA-75% increased from 16 to 32 weeks whereas that of HA-50% was unchanged. HA-50% implants had 100% more bone ingrowth than HA-75% implants after 16 weeks. More HA coating was removed on HA-50% implants compared with HA-75% implants after both 16 and 32 weeks. No further loss of the HA coating was shown from 16 to 32 weeks. Our study suggests that the crystallinity of the HA coating is an important factor in its bioactivity and resorption during weight-bearing conditions. Our findings suggest two phases of coating resorption, an initial rapid loss, followed by a slow loss. Resorbed HA coating was partly replaced by bone ingrowth, suggesting that implant fixation will be durable. (+info)Third component of complement (C3): structural properties in relation to functions. (8/747)
The third component of complement (C3) fulfills a pivotal role in the functions of the complement system. We have investigated the topological relationships among its polypeptide chains, physiologic fragments, enzyme attack regions, and functional sites. C3 consists of two chains (alpha and beta) which are linked by disulfide bonds and noncovalent forces and which have molecular weights of, respectively, 120,000 and 75,000. C3 is activated by action of C3 convertase on the alpha-chain. With hydrolysis of one polypeptide bonds, C3a, the 9000 dalton activation peptide is dislocated from the NH2-terminal portion of the alpha-chain. A previously concealed binding region is thereby transiently revealed in the C3b-fragment (181,000 dalton) which displays affinity for apparently nonspecific acceptors present on biological membranes. Binding of nascent C3b membranes occurs through the C3d portion of the fragment because subsequent action of the C3b-inactivator or trypsin on bound C3b causes release of C3c, but not of C3d. Bound C3b and C3d possess stable sites that are capable of binding to specific receptors present on a limited variety of cells. We propose that all known physiologically occurring fragments of C3 arise by enzymatic cleavage of the alpha-chain: C3a, C3b, C3c, and C3d. Whereas C3a (alpha1) and C3e (alpha2) consist of a single chain and C3b consists of two chains (alpha' and beta), C3c is composed of the entire beta-chain and multiple fragments of the alpha-chain, each of which is linked by disulfide bonds to the beta-chain. (+info)Hydroxyapatite is a calcium phosphate mineral that makes up about 70% of the inorganic component of bone and teeth in humans and other animals. It has the chemical formula Ca10(PO4)6(OH)2. Hydroxyapatite is a naturally occurring mineral form of calcium apatite, with the idealized crystal structure consisting of alternating calcium and phosphate layers.
In addition to its natural occurrence in bone and teeth, hydroxyapatite has various medical applications due to its biocompatibility and osteoconductive properties. It is used as a coating on orthopedic implants to promote bone growth and integration with the implant, and it is also used in dental and oral healthcare products for remineralization of tooth enamel. Furthermore, hydroxyapatite has been studied for its potential use in drug delivery systems, tissue engineering, and other biomedical applications.
Hydroxyapatite
Octacalcium phosphate
Fouling
Biomineralization
Phosphate mineral
Tricalcium phosphate
Calcium supplement
Ocular prosthesis
Mechanical properties of biomaterials
Thomas J. Webster
Johnbaumite
Elizabeth Tanner
Classification of non-silicate minerals
Topical fluoride
Spark plasma sintering
Synovial fluid
Apatite
Artificial bone
Molecular dynamics
E. K. T. Sivakumar
Enamel prism
Phosphorus
Bone sialoprotein
Bicon Dental Implants
Porous silicon
Laminoplasty
Magnesium oxide
Brushite
Freeze-casting
Clemens van Blitterswijk
Hydroxyapatite - Wikipedia
Hydroxyapatite News, Research - Page 6
Synthesis of hydroxyapatite with adsorbed and intracrystalline biomolecules
Effect of nano-hydroxyapatite and ozone on approximal initial caries: a randomized clinical trial | Scientific Reports
Hydroxyapatite Whiskers Based Resin Composite versus Commercial Dental Composites: Mechanical and Biocompatibility...
Nano Hydroxyapatite Research - CariFree
Hydroxyapatite in Dental Care - ChemistryViews
502e) Biomimetic Self-Assembling Copolymer-Hydroxyapatite Nanocomposites with the Nanocrystal Size Controlled by Citrate | AIChE
Effects of Controlled Crystalline Surface of Hydroxyapatite on Methane Oxidation Reactions (Journal Article) | DOE PAGES
Load-Bearing Behavior of a Simulated Craniofacial Structure Fabricated From a Hydroxyapatite Cement and Bioresorbable Fiber...
Lamberti Hydroxyapatite | Lamberti Group
Materials | Free Full-Text | Microstructure and Mechanical Properties of Inverse Nanocomposite Made from Polylactide and...
Bunion Shield,Bone Hydroxyapatite Suppliers & Manufacturers
Tooth Soap® with Calcium Microcrystalline Hydroxyapatite Halts Tooth Decay
Bio-Gel HTP Hydroxyapatite #1300420 | Bio-Rad
Reactivity of ethanol over hydroxyapatite-based Ca-enriched catalysts with various carbonate contents - Catalysis Science &...
Hydroxyapatite puriss., meets analytical specification of Ph. Eur., BP, FCC, E341, = 90 calculated on glowed substance 1306-06-5
From wood to bone: multi-step process to convert wood hierarchical structures into biomimetic hydroxyapatite scaffolds for bone...
Characterization of Plasma Sprayed Hydroxyapatite Coatings on AISI 316L SS and Titanium Substrate and their Corrosion Behavior...
Electrospun Composites of PHBV, Silk Fibroin and nano-Hydroxyapatite for Bone Tissue Engineering
Magnetic Resonance Functional Nano-hydroxyapatite Incorporated Poly(caprolactone) Composite Scaffolds for in Situ Monitoring of...
Bio-inspired nanocomposite by layer-by-layer coating of chitosan/hyaluronic acid multilayers on a hard nanocellulose...
Sustained delivery of a heterodimer bone morphogenetic protein-2/7 via a collagen hydroxyapatite scaffold accelerates and...
Preparation and characterization of multiactive electrospun fibers:Poly-ε-carpolactone fibers loaded with hydroxyapatite and...
Calcium Hydroxylapatite Over a Decade of Clinical Experience | JCAD | The Journal of Clinical and Aesthetic Dermatology
Strontium-doped hydroxyapatite as adsorbent effectively to remove lead ions from water | Research Square
Synthesis and characterization of wool keratin/hydroxyapatite nanocomposite<...
Immediate Loading of a Single Hydroxyapatite-Coated Threaded Root Form Implant: A Clinical Report | Journal of Oral Implantology
Effectiveness of calcium hydroxylapatite paste in vocal rehabilitation<...
Nano-hydroxyapatite13
- As of 2019[update], the use of hydroxyapatite, or its synthetically manufactured form, nano-hydroxyapatite, is not yet common practice. (wikipedia.org)
- The aim of the study was to assess the efficacy of three methods of enamel remineralization on initial approximal caries: (1) a nano-hydroxyapatite gel, (2) gaseous ozone therapy, (3) combination of a nano-hydroxyapatite gel and ozone. (nature.com)
- Patients (n = 92, age 20-30 years) with initial approximal enamel lesions on premolar and molar teeth (n = 546) were randomly allocated to three groups subjected to a 6-months treatment: Group I: domestic nano-hydroxyapatite remineralizing gel, group II: in-office ozone therapy, group III: both domestic remineralizing gel and ozone therapy. (nature.com)
- Thus nano-hydroxyapatite gel and ozone therapy exert some capacities to remineralize approximal enamel and dentine subsurface lesions of premolar and molar teeth. (nature.com)
- Moreover, the combination of both methods produces the best effect compared to nano-hydroxyapatite or ozone therapy applied alone. (nature.com)
- One approach is to remineralize the lesion body with fluoride, casein phosphopeptide amorphous calcium phosphate (CPP-ACP) or nano-hydroxyapatite (nHAP). (nature.com)
- Electrospinning of fibrous scaffolds containing nano-hydroxyapatite (nHAp) embedded in a matrix of functional biomacromolecules offers an attractive route to mimicking the natural bone tissue architecture. (ad-astra.ro)
- Electrospinning of biomaterials composed of polyhydroxybutyrate-co-(3-hydroxyvalerate) with 2% valerate fraction (PHBV), nano-hydroxyapatite (nHAp), and Bombyx mori silk fibroin essence (SF), Mw = 90KDa, has been achieved for nHAp and SF solution concentrations of 2 (w/vol) % each and 5 (w/vol) % each. (ad-astra.ro)
- In the present study, we evaluated molecular pathways underlying the intracellular balance between redox homeostasis and extracellular matrix mineralization of DPSCs in the presence of composite scaffolds made of alginate and nano-hydroxyapatite (Alg/HAp). (uni-regensburg.de)
- A nano-hydroxyapatite toothpaste (synthetic hydroxyapatite toothpaste) or other hydroxyapatite toothpaste can do the same for oral health. (trysnow.com)
- So, first and foremost, what exactly is hydroxyapatite and nano-hydroxyapatite toothpaste (synthetic hydroxyapatite), and why is it in many brand formulas? (trysnow.com)
- With the advances on biomaterials research have suggested that the best osteoconductivity of hydroxyapatite could be achieved if the crystal was closer to the structure, size and morphology of biological apatite, so the nano-hydroxyapatite (nano-HA) is of current interest. (bvsalud.org)
- The aim of this study was to evaluate the biocompatibility and osteoconductive in surgical defects filled with spheres of nano-hydroxyapatite containing strontium 1% (nano-SrHA), nano-hydroxyapatite stoichiometric (nano-HA) when compared to the blood clot (control). (bvsalud.org)
Nanoparticles1
- Three examples of nanoparticles in products used in dentistry are titanium dioxide (TiO 2 ), silver (Ag), and hydroxyapatite (HAP). (drdanenberg.com)
Collagen9
- Bone is a nanocomposite that mainly contains nano-sized hydroxyapatite (HAp) crystals and the fibrous protein collagen. (aiche.org)
- In this study, we compared the osteoinductive potential of BMP-2 homodimer with a heterodimer of BMP-2/7, both delivered via a collagen-hydroxyapatite (CHA) scaffold delivery system, with the aim to reduce the overall therapeutic BMP doses and the associated side-effects. (lu.se)
- We first show that the incorporation of hydroxyapatite in collagen-based BMP delivery systems is pivotal for achieving efficient BMP sequestration and controlled release. (lu.se)
- Incorporation of hydroxyapatite (HA) in a collagen scaffold dramatically improves bone morphogenic protein (BMP) sequestration via biophysical interactions with BMP, thereby providing more controlled BMP release compared with pristine collagen. (lu.se)
- Calcium hydroxylapatite combines high elasticity and viscosity with an ability to induce long-term collagen formation making it an ideal agent for a global facial approach. (jcadonline.com)
- Synthesis of Hydroxyapatite/Collagen (HA. (yildiz.edu.tr)
- A new biomimetic precipitation technique was developed to synthesize hydroxyapatite/collagen nanocomposites. (yildiz.edu.tr)
- These results suggest that the hydroxyapatite/collagen nano-composites are promising biomaterials for bone tissue engineering. (yildiz.edu.tr)
- Urethral bulking agents reported in the literature include autologous fat, glutaraldehyde cross-linked bovine collagen, calcium hydroxylapatite, pyrolytic carbon-coated beads, polydimethylsiloxane, ethylene vinyl alcohol copolymer, dextranomer hyaluronic acid, and polytetrafluoroethylene. (medscape.com)
Crystals7
- Each technique yields hydroxyapatite crystals of varied characteristics, such as size and shape. (wikipedia.org)
- The mineral ions introduced during remineralisation restore the structure of the hydroxyapatite crystals. (wikipedia.org)
- If fluoride ions are present during the remineralisation, through water fluoridation or the use of fluoride-containing toothpaste, the stronger and more acid-resistant fluorapatite crystals are formed instead of the hydroxyapatite crystals. (wikipedia.org)
- Taking the inspiration from the biomineral, the wool keratin was selected to modulate the assembly of nanosized hydroxyapatite (HA) crystals via a coprecipitation method. (manchester.ac.uk)
- The area around Cerro Huanaquino is best known for its excellent Magnetite specimens, but a close second behind these pieces are the attractive and very well crystallized Carbonate-rich Hydroxylapatite crystals. (minclassics.com)
- Carbonate-rich Hydroxylapatite is actually a variety of Hydroxylapatite, and is well known from a fair number of world localities, but not often are the crystals as large, attractive and well-formed as the Bolivian specimens. (minclassics.com)
- and OSTEOCLASTS, while FIBRILLAR COLLAGENS and hydroxyapatite crystals form the BONE MATRIX. (bvsalud.org)
Synthesis2
- Clinical studies have shown that the composition based on calcium hydroxyapatite , having osteoconductive, antioxidant and anti-inflammatory properties, activates the synthesis of organic and mineral components, that promotes the bioreparation and regeneration processes of periapical tissues in chronic granulomatous periodontitis , which occurred most intensively during the first 6 months after treatment . (bvsalud.org)
- Composition based on calcium hydroxyapatite , having osteoconductive, antioxidant and anti-inflammatory properties, activates the synthesis of organic and mineral components, which promotes the processes of bioreparation and regeneration of periapical tissues , especially in the early stages. (bvsalud.org)
Incorporation of hydroxyapatite1
- 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)
Scaffolds2
- Hydroxyapatite ( HA ) bone scaffolds characterized by highly organized hierarchical structures have been obtained by chemically transforming native woods through a sequence of thermal and hydrothermal processes . (rsc.org)
- For this purpose, alginate/hydroxyapatite (Alg/HAp) composite scaffolds using a novel production design were successfully developed and tested for their biocompatibility and osteoconductive properties in vitro. (uni-regensburg.de)
Characterization1
- M. Mittal, S. Nath and S. Prakash, "Characterization of Plasma Sprayed Hydroxyapatite Coatings on AISI 316L SS and Titanium Substrate and their Corrosion Behavior in Simulated Body Fluid," Journal of Minerals and Materials Characterization and Engineering , Vol. 10 No. 11, 2011, pp. 1041-1049. (scirp.org)
Powder2
- Pure hydroxyapatite powder is white. (wikipedia.org)
- I would like someone to contact me with more information regarding Hydroxyapatite (HAp) (acicular) Powder. (thermalspraydirectory.com)
Ions2
- During demineralisation, calcium and phosphorus ions are drawn out from the hydroxyapatite. (wikipedia.org)
- In this study, a strontium-doped hydroxyapatite (Sr-HAP) was synthesized by the sol-gel method, which used as adsorbent to remove lead ions (Pb 2+ ) from water. (researchsquare.com)
Crystalline4
- Their dactyl appendages have excellent impact resistance due to the impact region being composed of mainly crystalline hydroxyapatite, which offers significant hardness. (wikipedia.org)
- 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)
- About 85% of the about 500 to 700 g of phosphate in the body is contained in bone, where it is an important constituent of crystalline hydroxyapatite. (msdmanuals.com)
Abstract1
- abstract = "Objectives: We determined the effectiveness of calcium hydroxylapatite (CaHA) paste in vocal rehabilitation. (northwestern.edu)
Bioactive2
- 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)
- Multifunctional corrosion resistant and bioactive coatings containing hydroxyapatite Ca 10 (PO 4 ) 6 (OH) 2 and magnesium oxide MgO were obtained on Mg-Mn-Ce alloy by plasma electrolytic oxidation. (manchester.ac.uk)
Biomimetic1
- Hydroxyapatite can be synthesized via several methods, such as wet chemical deposition, biomimetic deposition, sol-gel route (wet-chemical precipitation) or electrodeposition. (wikipedia.org)
Chromatography1
- Explant DNA was isolated using hydroxylapatite chromatography, and the BaP metabolites in the medium were analyzed by high pressure liquid chromatography. (cdc.gov)
Stoichiometric2
- The non-stoichiometric phases have the hydroxyapatite structure with cation vacancies (Ca2+) and anion (OH−) vacancies. (wikipedia.org)
- The sites occupied solely by phosphate anions in stoichiometric hydroxyapatite, are occupied by phosphate or hydrogen phosphate, HPO2−4, anions. (wikipedia.org)
Calcium phosphates1
- Of all the calcium phosphates in dental care products, hydroxyapatite (HAP, Ca 5 (PO 4 ) 3 OH) shows the closest chemical match to human tooth enamel crystallites and is, therefore, biocompatible. (chemistryviews.org)
Morphology1
- Morphology studies showed that hydroxyapatite particles with the average size of 50 nm were distributed homogeneously in the polymer matrix. (yildiz.edu.tr)
Calcific2
- Hydroxylapatite deposits in tendons around joints results in the medical condition calcific tendinitis. (wikipedia.org)
- However, hydroxyapatite (HA) ( calcific tendonitis ) or calcium pyrophosphate (CPPD) ( pseudogout ), though rare in this location, were also possibilities. (medscape.com)
Deposition1
- A potential explanation of the association between elevated serum phosphate levels and calcified AS may be hydroxyapatite deposition, which can induce the formation of osteoblast-like interstitial stromal cells and smooth muscle cells. (medscape.com)
Phosphorus1
- A periodic layer underneath the impact layer composed of hydroxyapatite with lower calcium and phosphorus content (thus resulting in a much lower modulus) inhibits crack growth by forcing new cracks to change directions. (wikipedia.org)
Nanofibers1
- In an article recently published in the journal Science and Technology of Advanced Materials, iBB researchers Frederico Barbosa, João Silva, Fábio Garrudo, Marta Carvalho, Paola Alberte, Leonor Resina and Frederico Ferreira, in collaboration with colleagues from the University of Nottingham and the Universitat Politècnica de Catalunya, developed novel hydroxyapatite-filled PVDF-TrFE nanofibers with enhanced piezoelectrical properties and osteogenic potential. (scoop.it)
Composite3
- 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)
- It was revealed that the inorganic phase in the nano-composite was carbonate-substituted hydroxyapatite with low crystallinity. (yildiz.edu.tr)
Chitosan2
- This study proposed a layer-by-layer technique on the hard CNCs/hydroxyapatite (HAP) matrix using biodegradable and biocompatible chitosan and hyaluronic acid (HA). (eurekamag.com)
- 2015 ) prepared a hydroxyapatite/chitosan (HAP/CS) porous material with a pore size of 100 ~ 300mm to adsorb Pb 2+ , and its maximum adsorption capacity was 264.42 mg/g. (researchsquare.com)
Silica4
- 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)
- Data obtained show better interfacial interaction with filler/matrix until 20 wt% of hydroxyapatite whiskers partially replaced silica particles filler. (hindawi.com)
- In particular, six different ratios of hydroxyapatite/silica particles were investigated. (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)
Cement2
- Reconstruction of Mastoid Cortex Defects with Hydroxyapatite Cement for Negative Sequelae of Mastoidectomy. (uchicago.edu)
- Hemostasis and obliteration of mandibular arteriovenous malformation through direct hydroxyapatite cement injection into the molar cavity. (uchicago.edu)
Enamel3
- Carbonated calcium-deficient hydroxyapatite is the main mineral of which dental enamel and dentin are composed. (wikipedia.org)
- Hydroxyapatite is the main mineral component of enamel in teeth. (wikipedia.org)
- As the main biomineral component in enamel and dentine, hydroxyapatite is responsible for their higher mechanical performances. (hindawi.com)
Bone tissue1
- In order to increase the bone bioactivity of metallic implants, hydroxyapatite (HA: Ca 10 (PO 4 ) 2 (OH) 6 ) is often coated on their surface so that real bond with surrounding bone tissue can be formed. (scirp.org)
Dentistry1
- The hydroxyapatite nanocrystal suspension can be prepared by a wet chemical precipitation reaction following the reaction equation below: 10 Ca(OH)2 + 6 H3PO4 → Ca10(PO4)6(OH)2 + 18 H2O The ability to synthetically replicate hydroxyapatite has invaluable clinical implications, especially in dentistry. (wikipedia.org)
Corrosion1
- It was found that the hydroxyapatite coating provided excellent corrosion resistance. (scirp.org)
Constituent1
- Hydroxylapatite is a constituent of calcium phosphate kidney stones. (wikipedia.org)
Hexagonal1
- This piece is a great thumbnail sized specimen of Carbonate-rich Hydroxylapatite with well-defined hexagonal form, a soft peach-tan color, medium luster, and is somewhat translucent. (minclassics.com)
20171
- 2017 ) studied the magnetic hydroxyapatite-mixed oxidation of multi-walled carbon nanotubes (mHAP-oMWCNTs) to remove Pb 2+ in water, and the results showed that mHAP-oMWCNTs showed better performance than mHAP, mMWCNT and HAP-oMWCNTs. (researchsquare.com)
Teeth5
- When Calcium Microcrystalline Hydroxyapatite (MCHA) is applied topically to teeth, it can provide a number of benefits that promote oral health. (toothsoap.com)
- In summary, the topical application of Calcium Microcrystalline Hydroxyapatite on teeth can provide a range of benefits that promote oral health and improve the appearance of teeth. (toothsoap.com)
- Tooth Soap® has always been a vital part of the miracle formula for fantastic teeth and gums and now with the addition of calcium hydroxyapatite in its microcrystalline form brings Tooth Soap® into a new era. (toothsoap.com)
- Hydroxyapatite toothpaste can create a barrier from dental caries forming on the surfaces of your teeth. (trysnow.com)
- 5] A. Elkayar, Y. Elshazly & M. Assaad, Properties Of Hydroxyapatite from Bovine Teeth . (uns.ac.id)
Dental1
- 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)
Fillers1
- Background: Calcium hydroxylapatite is one of the most well-studied dermal fillers worldwide and has been extensively used for the correction of moderate-to-severe facial lines and folds and to replenish lost volume. (jcadonline.com)
Properties4
- These variations have a marked effect on the biological and mechanical properties of the compound, and therefore these hydroxyapatite products have different clinical uses. (wikipedia.org)
- These properties attract the attention of many companies, that develop hydroxyapatite-based solutions for the orthopedic and plastic surgery markets. (lamberti.com)
- By playing with composition, size and shape, surface and multi-functionality modification, a wide range of hydroxyapatite-based application properties can be achieved. (lamberti.com)
- Objectives: To mark the milestone of 10 years of use in the aesthetic field, this review will consider the evolution of calcium hydroxylapatite in aesthetic medicine, provide a detailed injection protocol for a global facial approach, and examine how the unique properties of calcium hydroxylapatite provide it with an important place in today's market. (jcadonline.com)
Ratios1
- The Guerbet reaction of ethanol to produce heavier products was performed over a series of extensively characterized carbonate-containing hydroxyapatites (HAPs) with different Ca/P ratios and thus different densities, strengths and natures of acid and basic sites. (rsc.org)
Defects1
- Hydroxyapatite (HA), Ca 10 (PO 4 ) 6 (OH) 2 , was introduced since 1975 as filling material for intrabony defects [ 1 - 4 ]. (hindawi.com)
Implant2
- Recipient(s) will receive an email with a link to 'Immediate Loading of a Single Hydroxyapatite-Coated Threaded Root Form Implant: A Clinical Report' and will not need an account to access the content. (allenpress.com)
- Influence of coralline hydroxyapatite used as an ocular implant on the dose distribution of external beam photon radiation therapy. (uchicago.edu)
Surface1
- Calcium microcrystalline hydroxyapatite may help mend those surface cavities around the gum line and cavities in fissures, the most common place for tooth decay to show up. (toothsoap.com)
Formula1
- Hydroxyapatite (IMA name: hydroxylapatite) (Hap, HAp, or HA) is a naturally occurring mineral form of calcium apatite with the formula Ca5(PO4)3(OH), often written Ca10(PO4)6(OH)2 to denote that the crystal unit cell comprises two entities. (wikipedia.org)
Conclusion1
- Conclusion: Calcium hydroxylapatite is a very effective agent for many areas of facial soft tissue augmentation and is associated with a high and well-established safety profile. (jcadonline.com)
Toothpastes1
- Is there any risk of lead in Hydroxyapatite toothpastes that you know of? (ireadlabelsforyou.com)
Carbon2
- 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)
- 2013 ) prepared Si-CHAP by hydrothermally doping silicon carbon into hydroxyapatite. (researchsquare.com)
Injection1
- Methods: This article is an up-to-date review of calcium hydroxylapatite in aesthetic medicine along with procedures for its use, including a detailed injection protocol for a global facial approach by three expert injectors. (jcadonline.com)
Resin3
- After this threshold, the mechanical performances decrease dramatically due to both the hydroxyapatite agglomerates formation and the low degree of resin conversion. (hindawi.com)
- CHT Ceramic Hydroxyapatite XT Media and Nuvia HP-Q Resin. (bio-rad.com)
- CHT Ceramic Hydroxyapatite XT (CHT XT) Mixed-Mode Media was formulated in response to customers' need for a more robust and stable resin that can maintain the superior performance of CHT resins. (bio-rad.com)
Molecules1
- Quercetin and lactoferrin are the best candidates for the development of a complex of the two molecules absorbed on bio combability structure as hydroxyapatite. (unina.it)
Form1
- Up to 50% by volume and 70% by weight of human bone is a modified form of hydroxyapatite, known as bone mineral. (wikipedia.org)