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calcium phosphate

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https://www.readbyqxmd.com/read/28822799/effect-of-application-sequence-of-fluoride-and-cpp-acp-on-remineralization-of-white-spot-lesions-in-primary-teeth-an-in-vitro-study
#1
Ola B Al-Batayneh, Reem A Jbarat, Susan N Al-Khateeb
OBJECTIVE: To explore how application sequence of casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) and fluoride influences remineralization of enamel white spot lesions (WSL) in primary teeth. DESIGN: In this in-vitro study, artificial WSLs were created in 130 primary teeth. Teeth were divided into 4 groups (n=27) and a control group (n=22) and exposed to one of the following remineralization regimens for 10 weeks: Group-1; 500ppm fluoride dentifrice; Group-2; 10% w/v CPP-ACP; Group-3; fluoride applied first, then CPP-ACP; Group-4; CPP-ACP applied first, then fluoride, and Group-5 was control...
August 10, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28822139/confocal-raman-mapping-of-collagen-cross-link-and-crystallinity-of-human-dentin-enamel-junction
#2
Amel Slimani, Fares Nouioua, Alban Desoutter, Bernard Levallois, Frédéric J G Cuisinier, Hervé Tassery, Elodie Terrer, Hamideh Salehi
The separation zone between enamel and dentin [dentin-enamel junction (DEJ)] with different properties in biomechanical composition has an important role in preventing crack propagation from enamel to dentin. The understanding of the chemical structure (inorganic and organic components), physical properties, and chemical composition of the human DEJ could benefit biomimetic materials in dentistry. Spatial distribution of calcium phosphate crystallinity and the collagen crosslinks near DEJ were studied using confocal Raman microscopy and calculated by different methods...
August 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28821107/relationship-between-multi-scale-structures-and-properties-of-photophobic-films-based-on-hydroxypropyl-methylcellulose-and-monosodium-phosphate
#3
Liang Zhang, Yan Zhao, Jian-Ya Qian, Shan Jiang, Jun Liu, Xiao-Long He
Photophobic (white) films were prepared with hydroxypropyl methylcellulose (HPMC) and monosodium phosphate (NaH2PO4) to overcome the redox reaction induced by titanium dioxide photocatalysis of HPMC/TiO2 white film. What's more, HPMC/NaH2PO4 white film could overcome the drying temperature dependent property of white films based on HPMC and calcium salts. Attenuated total reflection Fourier transform infrared spectroscopy, wide angel X-ray diffraction, small angle X-ray scattering, scanning electron microscope and texture analyzer were used to investigate the effect of NaH2PO4 on the short-range, supra-molecular structures and properties of HPMC film...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821025/fabrication-and-characterization-of-water-dispersed-chitosan-nanofiber-poly-ethylene-glycol-diacrylate-calcium-phosphate-based-porous-composites
#4
Sachiko Nitta, Ayaka Komatsu, Taisei Ishii, Masatoshi Ohnishi, Atsuko Inoue, Hiroyuki Iwamoto
We evaluated the capacity of chitosan nanofiber (CNF)- and poly(ethylene glycol) (PEG)-based hydrogel/calcium phosphate hybrid (CNF-PEG/CaP) composites to act as scaffolding materials. CNF-PEG/CaP composites were fabricated by mineralization of CNF-PEG hydrogels using an alternate soaking method. The amount of CaP mineralized on CNF-PEG hydrogels increased as the ratio of CNF in the CNF-PEG hydrogel increased. Young's modulus of CNF-PEG/CaP hydrogels was enhanced by increase in CNF ratio. It was further confirmed that osteoblasts embedded on the CNF-PEG/CaP composites were viable after incubation for 5days and firmly attached to the CaP porous layer, forming an extensive cell-scaffold leading to cell-cell interactions...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28819908/the-effect-of-cationically-modified-phosphorylcholine-polymers-on-human-osteoblasts-in-vitro-and-their-effect-on-bone-formation-in-vivo
#5
Jonathan M Lawton, Mariam Habib, Bingkui Ma, Roger A Brooks, Serena M Best, Andrew L Lewis, Neil Rushton, William Bonfield
The effect of introducing cationic charge into phosphorylcholine (PC)-based polymers has been investigated in this study with a view to using these materials as coatings to improve bone formation and osseointegration at the bone-implant interface. PC-based polymers, which have been used in a variety of medical devices to improve biocompatibility, are associated with low protein adsorption resulting in reduced complement activation, inflammatory response and cell adhesion. However, in some applications, such as orthopaedics, good integration between the implant and bone is needed to allow the distribution of loading stresses and a bioactive response is required...
August 17, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28815282/correction-of-vitamin-d-status-by-calcidiol-pharmacokinetic-profile-safety-and-biochemical-effects-on-bone-and-mineral-metabolism-of-daily-and-weekly-dosage-regimens
#6
S Minisola, L Cianferotti, P Biondi, C Cipriani, C Fossi, F Franceschelli, F Giusti, G Leoncini, J Pepe, H A Bischoff-Ferrari, M L Brandi
RATIONALE: Calcidiol can be employed to correct vitamin D deficiency. MAIN RESULTS: Calcidiol administered at daily and weekly regimens over a period of 3 months was able to successfully raise 25-hydroxyvitamin D levels without altering other markers related to bone and mineral metabolism. SIGNIFICANCE: Calcidiol supplementation is effective and safe. INTRODUCTION: The correction of vitamin D status is necessary to maintain an optimal mineral and skeletal homeostasis...
August 16, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28815162/clinical-application-of-ceramics-in-anterior-cervical-discectomy-and-fusion-a-review-and-update
#7
REVIEW
Shayan Abdollah Zadegan, Aidin Abedi, Seyed Behnam Jazayeri, Hirbod Nasiri Bonaki, Alexander R Vaccaro, Vafa Rahimi-Movaghar
STUDY DESIGN: Narrative review. OBJECTIVES: Anterior cervical discectomy and fusion (ACDF) is a reliable procedure, commonly used for cervical degenerative disc disease. For interbody fusions, autograft was the gold standard for decades; however, limited availability and donor site morbidities have led to a constant search for new materials. Clinically, it has been shown that calcium phosphate ceramics, including hydroxyapatite (HA) and tricalcium phosphate (TCP), are effective as osteoconductive materials and bone grafts...
June 2017: Global Spine Journal
https://www.readbyqxmd.com/read/28811853/effects-of-sevelamer-hydrochloride-on-uremic-toxins-serum-indoxyl-sulfate-and-p-cresyl-sulfate-in-hemodialysis-patients
#8
Cheng-Jui Lin, Chi-Feng Pan, Chih-Kuang Chuang, Hsuan-Liang Liu, Sung-Fa Huang, Han-Hsiang Chen, Chih-Jen Wu
BACKGROUND: Beside the phosphate binding effect, non-calcium non-aluminum phosphate binder, namely sevelamer hydrochloride (SH), has many other effects in dialysis patients. It can absorb many other compounds, decrease low-density lipoprotein cholesterol (LDL-C) level, and attenuate the progression of vascular calcification; it has been reported to have anti-inflammatory effect. However, it is not clear whether it has any effect on uremic toxins, i.e. serum indoxyl sulfate (IS) and p-cresyl sulfate, (PCS) in hemodialysis (HD) patients...
September 2017: Journal of Clinical Medicine Research
https://www.readbyqxmd.com/read/28808392/antiurolithiatic-effect-of-sirupeelai-samoola-kudineer-a-polyherbal-siddha-decoction-on-ethylene-glycol-induced-renal-calculus-in-experimental-rats
#9
A Hannah Rachel Vasanthi, V Muthulakshmi, V Gayathri, R Manikandan, S Ananthi, Sarah Kuruvilla
BACKGROUND: Sirupeelai Samoola Kudineer (SK), a polyherbal decoction containing four medicinal plants has been used in Siddha system of medicine, practiced in Southern parts of India for the management of urolithiasis. OBJECTIVE: The present study is carried out to scientifically validate the traditional claim and to study the mechanism of action of the drug. MATERIALS AND METHODS: In the present study, anti-urolithiatic effect of SK was evaluated in Sprague-Dawley rats using ethylene glycol through drinking water and intraperitoneal injection of sodium oxalate...
July 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28806419/effects-of-short-term-dry-immersion-on-bone-remodeling-markers-insulin-and-adipokines
#10
Marie-Thérèse Linossier, Liubov E Amirova, Mireille Thomas, Myriam Normand, Marie-Pierre Bareille, Guillemette Gauquelin-Koch, Arnaud Beck, Marie-Claude Costes-Salon, Christine Bonneau, Claude Gharib, Marc-Antoine Custaud, Laurence Vico
BACKGROUND: Dry immersion (DI), a ground-based model of microgravity previously used in Russia, has been recently implemented in France. The aim of this study was to analyze early events in a short-term DI model in which all conditions are met to investigate who is first challenged from osteo- or adipo-kines and to what extent they are associated to insulin-regulating hormones. METHODS: Twelve healthy men were submitted to a 3-day DI. Fasting blood was collected during pre-immersion phase for the determination of the baseline data collection (BDC), daily during DI (DI24h, DI48H and DI72h), then after recovery (R+3h and R+24h)...
2017: PloS One
https://www.readbyqxmd.com/read/28805704/effects-of-adding-polysaccharides-and-citric-acid-into-sodium-dihydrogen-phosphate-mixing-solution-on-the-material-properties-of-gelatin-hybridized-calcium-phosphate-cement
#11
Keishi Kiminami, Toshiisa Konishi, Minori Mizumoto, Kohei Nagata, Michiyo Honda, Hidetoshi Arimura, Mamoru Aizawa
We have succeeded in improving the material properties of a chelate-setting calcium-phosphate cement (CPC), which is composed of hydroxyapatite (HAp) the surface of which has been modified with inositol hexaphosphate (IP6) by adding α-tricalcium phosphate (α-TCP) powder. In order to create a novel chelate-setting CPC with sufficient bioresorbability, gelatin particles were added into the IP6-HAp/α-TCP cement system to modify the material properties. The effects of adding polysaccharides (chitosan, chondroitin sulfate, and sodium alginate) into the sodium dihydrogen phosphate mixing solution on the material properties of the gelatin-hybridized CPC were evaluated...
August 12, 2017: Materials
https://www.readbyqxmd.com/read/28805211/all-atom-md-indicates-ion-dependent-behavior-of-therapeutic-dna-polymer
#12
Ryan L Melvin, William H Gmeiner, Freddie R Salsbury
Understanding the efficacy of and creating delivery mechanisms for therapeutic nucleic acids requires understanding structural and kinetic properties which allow these polymers to promote the death of cancerous cells. One molecule of interest is a 10 mer of FdUMP (5-fluoro-2'-deoxyuridine-5'-O-monophosphate) - also called F10. Here we investigate the structural and kinetic behavior of F10 in intracellular and extracellular solvent conditions along with non-biological conditions that may be efficacious in in vitro preparations of F10 delivery systems...
August 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28803411/electro-chemical-deposition-of-nano-hydroxyapatite-zinc-coating-on-titanium-metal-substrate
#13
N A El-Wassefy, F M Reicha, N S Aref
BACKGROUND: Titanium is an inert metal that does not induce osteogenesis and has no antibacterial properties; it is proposed that hydroxyapatite coating can enhance its bioactivity, while zinc can contribute to antibacterial properties and improve osseointegration. AIMS: A nano-sized hydroxyapatite-zinc coating was deposited on commercially pure titanium using an electro-chemical process, in order to increase its surface roughness and enhance adhesion properties...
August 13, 2017: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/28803246/biofunctional-ionic-doped-calcium-phosphates-silk-fibroin-composites-for-bone-tissue-engineering-scaffolding
#14
S Pina, R F Canadas, G Jiménez, M Perán, J A Marchal, R L Reis, J M Oliveira
The treatment and regeneration of bone defects caused by traumatism or diseases have not been completely addressed by current therapies. Lately, advanced tools and technologies have been successfully developed for bone tissue regeneration. Functional scaffolding materials such as biopolymers and bioresorbable fillers have gained particular attention, owing to their ability to promote cell adhesion, proliferation, and extracellular matrix production, which promote new bone growth. Here, we present novel biofunctional scaffolds for bone regeneration composed of silk fibroin (SF) and β-tricalcium phosphate (β-TCP) and incorporating Sr, Zn, and Mn, which were successfully developed using salt-leaching followed by a freeze-drying technique...
August 12, 2017: Cells, Tissues, Organs
https://www.readbyqxmd.com/read/28803191/enhancing-recovery-of-magnesium-as-struvite-from-landfill-leachate-by-pretreatment-of-calcium-with-simultaneous-reduction-of-liquid-volume-via-forward-osmosis
#15
Simiao Wu, Shiqiang Zou, Guannan Liang, Guangren Qian, Zhen He
Landfill leachate contains substances that can be potentially recovered as valuable resources. In this study, magnesium in a landfill leachate was recovered as struvite with calcium pretreatment; meanwhile, the leachate volume was reduced by using a submerged forward osmosis (FO) process, thereby enabling significant reduction of further treatment footprint and cost. Without pretreatment, calcium exhibited strong competition for phosphate with magnesium. The pretreatment with a Ca(2+): CO3(2-) molar ratio of 1:1...
August 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28802269/removal-of-soluble-strontium-into-biogenic-carbonate-minerals-from-a-highly-saline-solution-using-halophilic-bacterium-bacillus-sp-tk2d
#16
Takumi Horiike, Yuma Dotsuta, Yuriko Nakano, Asumi Ochiai, Satoshi Utsunomiya, Toshihiko Ohnuki, Mitsuo Yamashita
Radioactive strontium ((90)Sr) leaked into saline environments, including the ocean, from the Fukushima Daiichi Nuclear Power Plant after a nuclear accident. Since the removal of (90)Sr using general adsorbents (e.g., zeolite) is not efficient at high salinity, a suitable alternative immobilization method is necessary. Therefore, we incorporated soluble Sr into biogenic carbonate minerals generated by urease-producing microorganisms from a saline solution. An isolate, Bacillus sp. strain TK2d, from marine sediment removed > 99% Sr after contact for four days in a saline solution (1...
August 11, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28801122/deoxycholic-acid-a-metabolite-of-circulating-bile-acids-and-coronary-artery-vascular-calcification-in-ckd
#17
Anna Jovanovich, Tamara Isakova, Geoffrey Block, Jason Stubbs, Gerard Smits, Michel Chonchol, Makoto Miyazaki
BACKGROUND: Vascular calcification is common among patients with chronic kidney disease (CKD), and it is associated with all-cause and cardiovascular disease mortality. Deoxycholic acid, a metabolite of circulating bile acids, is elevated in CKD and induces vascular mineralization and osteogenic differentiation in animal models. STUDY DESIGN: Cohort analysis of clinical trial participants. SETTING & PARTICIPANTS: 112 patients with moderate to severe CKD (estimated glomerular filtration rate, 20-45mL/min/1...
August 9, 2017: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/28800875/local-delivery-of-sirna-loaded-calcium-phosphate-nanoparticles-abates-pulmonary-inflammation
#18
Annika Frede, Bernhard Neuhaus, Torben Knuschke, Munisch Wadwa, Sebastian Kollenda, Robert Klopfleisch, Wiebke Hansen, Jan Buer, Dunja Bruder, Matthias Epple, Astrid M Westendorf
The local interference of cytokine signaling mediated by siRNA-loaded nanoparticles might be a promising new therapeutic approach to dampen inflammation during pulmonary diseases. For the local therapeutic treatment of pulmonary inflammation, we produced multi-shell nanoparticles consisting of a calcium phosphate core, coated with siRNAs directed against pro-inflammatory mediators, encapsulated into poly(lactic-co-glycolic acid), and coated with a final outer layer of polyethylenimine. Nasal instillation of nanoparticles loaded with a mixture of siRNAs directed against different cytokines to mice suffering from TH1 cell-mediated lung inflammation, or of siRNA directed against NS-1 in an influenza infection model led to a significant reduction of target gene expression which was accompanied by distinct amelioration of lung inflammation in both models...
August 8, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28800464/accelerated-biomineralization-of-graphene-oxide-incorporated-cellulose-acetate-nanofibrous-scaffolds-for-mesenchymal-stem-cell-osteogenesis
#19
Xiaoyun Liu, He Shen, Saijie Song, Wei Chen, Zhijun Zhang
For bone tissue engineering, it requires that the scaffolds have excellent biocompatibility, proper mechanical and osteoinductive properties. Electrospun nanofibers with extracellular matrices mimicking structure have proven to be good scaffolds for bone tissue repairing. Hybrid nanofibers in particular, endow the nanofibers with specific and multiple functionalities, and therefore have attracted increasing interests in the recent years. In this study, we fabricated graphene oxide (GO)-incorporated cellulose acetate (CA) nanofibrous scaffolds by electrospinning technique for enhancement of biomineralization and osteogenic differentiation of human mesenchymal stem cells (hMSCs)...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28799938/improvement-of-phosphorus-removal-by-calcium-addition-in-the-iron-electrocoagulation-process
#20
I Mishima, M Hama, Y Tabata, J Nakajima
Small-scale wastewater treatment plants (SWTPs) are widely used as decentralized wastewater treatment systems in sparsely populated areas of Japan. Iron electrolysis, an electrocoagulation technology, is installed in these SWTPs for phosphorus removal. Phosphorus can be removed via the formation of an insoluble compound containing phosphate and iron, such as FePO4; however, it was necessary to determine the conditions under which phosphorus can be effectively and stably removed in actual SWTPs. According to previous studies using iron compounds, improved phosphorus removal was obtained by Ca addition...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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