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Silicate Calcium Phosphate

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https://www.readbyqxmd.com/read/28647239/fluoride-removal-by-al-ti-and-fe-hydroxides-and-coexisting-ion-effect
#1
Jianfeng Zhang, Timothy E Brutus, Jiemin Cheng, Xiaoguang Meng
Batch experiments were conducted to evaluate fluoride removal by Al, Fe, and Ti-based coagulants and adsorbents, as well as the effects of coexisting ions and formation of aluminum-fluoride complexes on fluoride removal by co-precipitation with alum (Al2(SO4)3·18H2O). Aluminum sulfate was more efficient than the other coagulants for fluoride removal in the pH range between 6 and 8. Nano-crystalline TiO2 was more effective for fluoride removal than Al and Fe hydroxides in a pH range of 3-5. Coexisting anions in water decreased the removal of fluoride in the order: phosphate (2...
July 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28645637/antimicrobial-and-biological-activity-of-leachate-from-light-curable-pulp-capping-materials
#2
Maria Teresa Arias-Moliz, Cher Farrugia, Christie Y K Lung, Pierre Schembri Wismayer, Josette Camilleri
OBJECTIVES: Characterization of a number of pulp capping materials and assessment of the leachate for elemental composition, antimicrobial activity and cell proliferation and expression. METHODOLOGY: Three experimental light curable pulp-capping materials, Theracal and Biodentine were characterized by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The elemental composition of the leachate formed after 24hours was assessed by inductively coupled plasma (ICP)...
June 20, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28622750/preparation-and-in%C3%A2-vivo-evaluation-of-a-silicate-based-composite-bone-cement
#3
Bing Ma, Zhiguang Huan, Chen Xu, Nan Ma, Haibo Zhu, Jipin Zhong, Jiang Chang
Silicate-based cements have been developed as a class of bioactive and biodegradable bone cements owing to their good in vitro bioactivity and ability to dissolve in a simulated body fluid. Until recently, however, the in vivo evidence of their ability to support bone regeneration is still scarce. In the present study, a pilot in vivo evaluation of a silicate-based composite bone cement (CSC) was carried out in a rabbit femur defect model. The cement was composed of tricalcium silicate, 45S5 bioglass and calcium sulfate, and the self-setting properties of the material were established...
January 1, 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/28561919/current-trends-and-future-perspectives-of-dental-pulp-capping-materials-a-systematic-review
#4
REVIEW
Wellington L O da Rosa, Alexandra R Cocco, Tiago M da Silva, Luana C Mesquita, Arthur Dias Galarça, Adriana F da Silva, Evandro Piva
To systematically review the literature to analyze the current trends and future perspectives of dental pulp capping materials through an analysis of scientific and technological data. This study is reported in accordance with the PRISMA Statement. Nine databases were screened: PubMed (MedLine), Lilacs, IBECS, BBO, Web of Science, Scopus, SciELO, Google Scholar, and The Cochrane Library. Additionally, the following patent applications were searched online in Questel Orbit (Paris, France), USPTO, EPO, JPO, INPI, and Patentscope databases...
May 31, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28561125/preparation-and-characterization-of-a-calcium-phosphate-silicon-coating-on-a-mg-zn-ca-alloy-via-two-step-micro-arc-oxidation
#5
Jinhe Dou, Yang Chen, Yiming Chi, Huancai Li, Guochao Gu, Chuanzhong Chen
Magnesium alloys are the most promising implant materials due to their excellent biodegradability. However, their high degradation rate limits their practical application. In this study, we produced a calcium-phosphate (Ca-P) coating and a calcium-phosphate-silicon (Ca-P-Si) coating via one-step and two-step micro-arc oxidation processes, respectively. The microstructure and chemical composition of the MAO coatings were characterized using SEM, XRD and EDS. The degradation behaviors of the MAO coatings and the substrate were investigated using electrochemical techniques and immersion tests in simulated body fluid (SBF)...
June 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28555144/uptake-of-silicon-by-sugarcane-from-applied-sources-may-not-reflect-plant-available-soil-silicon-and-total-silicon-content-of-sources
#6
Malcolm G Keeping
Soils of the tropics and sub-tropics are typically acid and depleted of soluble sources of silicon (Si) due to weathering and leaching associated with high rainfall and temperatures. Together with intensive cropping, this leads to marginal or deficient plant Si levels in Si-accumulating crops such as rice and sugarcane. Although such deficiencies can be corrected with exogenous application of Si sources, there is controversy over the effectiveness of sources in relation to their total Si content, and their capacity to raise soil and plant Si concentrations...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28532089/a-poly-2-hydroxyethyl-methacrylate-based-resin-improves-the-dentin-remineralizing-ability-of-calcium-silicates
#7
Paola Taddei, Carlo Prati, Maria Giovanna Gandolfi
Bioactive polymeric composites have received great attention for their capability to remineralize the dentin tissue. This study was aimed at evaluating if a poly(HEMA-co-TEGDMA) resin (HEMA: 2-hydroxyethyl methacrylate; TEGDMA: triethyleneglycol dimethacrylate) may increase the in vitro apatite forming ability of a calcium silicate cement (CaSi), in view of developing a hydrophilic light-curable composite bio-remineralizing restorative material (R-CaSi). To this purpose, the following experiments were carried out: (1) In vitro apatite forming ability of R-CaSi and CaSi was comparatively assessed by micro-Raman spectroscopy after immersion of the cement disks in Dulbecco's Phosphate Buffered Saline (DPBS) at 37°C for 1-28days; (2) Previously demineralized human dentin slices were soaked for 7days in close contact with the CaSi and R-CaSi cements as well as poly(HEMA), poly(TEGDMA) and poly(HEMA-co-TEGDMA), and then were comparatively analyzed by IR spectroscopy...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28470849/influence-of-early-mineral-deposits-of-silicate-and-aluminate-based-cements-on-push-out-bond-strength-to-root-dentine
#8
S Silva do Carmo, F F P Néspoli, L Bachmann, C E S Miranda, L M S Castro-Raucci, I R Oliveira, W Raucci-Neto
AIM: To evaluate mineral trioxide aggregate (MTA), Biodentine, and several formulations of calcium aluminate cements (CACb) in terms of their ability to release calcium ions (Ca(2+) ) and form apatite-like precipitates after short-term immersion in phosphate-buffered saline (PBS) and its influence on the bond strength to the root-end cavity. METHODOLOGY: Ten samples of MTA, Biodentine, CACb, and calcium-enriched aluminate cement (CACb+) were placed in contact with PBS or deionized water for 14 days...
May 4, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/28452115/properties-of-neomta-plus-and-mta-plus-cements-for-endodontics
#9
F Siboni, P Taddei, C Prati, M G Gandolfi
AIM: To test a novel calcium silicate cement mixed with a water-based gel (NoeMTA Plus) with regards to chemical-physical properties and apatite forming ability. METHODOLOGY: NeoMTA Plus (Avalon Biomed Inc. Bradenton, FL, USA; lot. 2014090301), and a commercial MTA-based material with similar properties (MTA Plus, Prevest Denpro Limited, Jammu, India; lot. 41001) were tested for ion-releasing ability, initial and final setting times, radiopacity, open and impervious porosity and apparent porosity, water sorption, weight loss, solubility, ability to nucleate calcium phosphates (CaP) after immersion in HBSS (Hank's Balance Salt Solution) by ESEM-EDX and Micro-Raman spectroscopy...
April 28, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/28415532/preparation-of-micro-porous-bioceramic-containing-silicon-substituted-hydroxyapatite-and-beta-tricalcium-phosphate
#10
Lih-Jyh Fuh, Ya-Jing Huang, Wen-Cheng Chen, Dan-Jae Lin
Dimensional instability caused by sintering shrinkage is an inevitable drawback for conventional processing of hydroxyapatite (HA). A new preparation method for biphasic calcium phosphates was developed to increase micro pores and biodegradation without significant dimensional change. Powder pressed HA discs, under 100MPa, were immersed in a colloidal mixture of tetraethoxysilane (TEOS) and ammonium hydroxide for 10min, followed by drying, and then were sintered at 900°C, 1050°C, and 1200°C, respectively...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28292596/why-biphasic-assessment-of-the-effect-on-cell-proliferation-and-expression
#11
Pierre Schembri-Wismayer, Josette Camilleri
INTRODUCTION: Tricalcium silicate (TCS)-based materials are used in endodontics because they are hydraulic and interact with blood, tissue fluids, and phosphate-based root canal irrigants, resulting in biomineralization. Newer-generation materials are biphasic; calcium phosphate is added to the TCS; thus, the material has 2 cementitious phases. The effect of this addition is not known; thus, the aim of this study was to characterize biphasic cements and assess cellular proliferation and expression...
March 11, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28269742/improving-the-biocompatibility-of-tobermorite-by-incorporating-calcium-phosphate-clusters
#12
Hirotaka Maeda, Tomoyuki Tamura, Toshihiro Kasuga
BACKGROUND: In our earlier work, tobermorite containing calcium phosphate (CP) clusters (CP-Tob) was hydrothermally prepared in the CaO-SiO2-P2O5-H2O system for biomedical applications. OBJECTIVE: CP-Tob was used to investigate the influence of CP cluster incorporation on its biocompatibility. METHODS: Tobermorite samples with and without CP clusters were hydrothermally prepared at 180°C for 40 h. The biocompatibility, structure, and density of states of the tobermorite samples were investigated by experimental and first principles methods...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28183671/effect-of-phosphorus-precursors-on-the-structure-of-bioactive-calcium-phosphate-silicate-systems
#13
Katalin Sinkó, Anikó Meiszterics, János Rohonczy, Balázs Kobzi, Shiro Kubuki
The main aim of this work was to synthesize calcium phosphate silicate bioceramics by a low energy-consuming sol-gel method applying various phosphorous precursors (triethyl phosphate, phosphoric acid, and ammonium hydrogen phosphate). The investigations concentrated on the influence of phosphorous initial compounds on the bond and crystalline structures and the material quality. The application of the alkoxide and inorganic P-precursors results in considerably different textures. The inorganic PO4-containing precursors lead to sol formations...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183631/in-vitro-stimulation-of-vascular-endothelial-growth-factor-by-borate-based-glass-fibers-under-dynamic-flow-conditions
#14
Sisi Chen, Qingbo Yang, Richard K Brow, Kun Liu, Katherine A Brow, Yinfa Ma, Honglan Shi
Bioactive borate glass has been recognized to have both hard and soft tissue repair and regeneration capabilities through stimulating both osteogenesis and angiogenesis. However, the underlying biochemical and cellular mechanisms remain unclear. In this study, dynamic flow culturing modules were designed to simulate the micro-environment near the vascular depletion and hyperplasia area in wound-healing regions, thus to better investigate the mechanisms underlying the biocompatibility and functionality of borate-based glass materials...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28155067/removal-and-recovery-of-phosphate-from-water-by-calcium-silicate-composites-novel-adsorbents-made-from-waste-glass-and-shells
#15
Dan Jiang, Yoshimasa Amano, Motoi Machida
The removal and recovery of phosphate from water by calcium-silicate composite (CSC) and alkali-treated calcium-silicate composite (ASC) was investigated. ASC had a higher specific surface area and total pore volume, and exhibited better performance of phosphate adsorption than CSC. In the batch mode adsorption studies, the isotherm adsorption experiments data fitted well the Langmuir isotherm model and the maximum adsorption capacities were 120 and 73.0 mg/g for ASC and for CSC, respectively. For the kinetic study, the experimental data fitted very well the pseudo-second-order kinetic model...
March 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28140347/properties-of-cao-sio2-p2o5-reinforced-calcium-phosphate-cements-and-in-vitro-osteoblast-response
#16
L Medvecky, R Stulajterova, M Giretova, T Sopcak, M Faberova
Non-cytotoxic and bioactive tetracalcium phosphate/nanomonetite/calcium silicate-phosphate cements were prepared by simple mechanical mixing of starting powder precursors based on acid or basic tetracalcium phosphate/nanomonetite mixtures with 1 or 5 wt% addition of precititated amorphous or crystalline calcium silicate phosphate phases. The small additions (1-2 wt%) of crystalline CaSiP phase caused about a two-fold rise in the compressive strength of cements (up to 70 MPa) with simultaneous preservation of short setting time (around 5 min) and refinement of nanohydroxyapatite particles in microstructure...
March 1, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28108959/innovative-root-end-filling-materials-based-on-calcium-silicates-and-calcium-phosphates
#17
Ali Abedi-Amin, Arlinda Luzi, Massimo Giovarruscio, Gaetano Paolone, Atanaz Darvizeh, Victoria Vivó Agulló, Salvatore Sauro
This in vitro study evaluated the apical sealing ability, bioactivity and biocompatibility of an experimental calcium silicate-based and two light-curing calcium silicate/calcium-phosphate cements as potential root end filling materials. A calcium silicate Portland-based (Control PC), an experimental calcium silicate (Exp. PC) and two light-curing cements (LC-CaP; LC-Si/CaP) were assessed for their alkalinising activity (pH) and biocompatibility. Single-rooted human canines were endodontically treated, filled with gutta-percha and finally submitted to apicoectomy...
February 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28106165/effects-of-sr-ht-gahnite-on-osteogenesis-and-angiogenesis-by-adipose-derived-stem-cells-for-critical-sized-calvarial-defect-repair
#18
Guifang Wang, Seyed-Iman Roohani-Esfahani, Wenjie Zhang, Kaige Lv, Guangzheng Yang, Xun Ding, Derong Zou, Daxiang Cui, Hala Zreiqat, Xinquan Jiang
Tissue engineering strategies to construct vascularized bone grafts are now attracting much attention. Strontium-hardystonite-Gahnite (Sr-HT-Gahnite) is a strong, highly porous, and biocompatible calcium silicate based bio-ceramic that contains strontium and zinc ions. Adipose derived stem cells (ASCs) have been demonstrated to have the ability in promoting osteogenesis and angiogenesis. In this study, the effects of Sr-HT-Gahnite on cell morphology, cell proliferation, and osteogenic differentiation of ASCs were systematically investigated...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28043751/bone-incorporation-of-silicate-substituted-calcium-phosphate-in-2-stage-revision-anterior-cruciate-ligament-reconstruction-a-histologic-and-radiographic-study
#19
Jan von Recum, Johannes Schwaab, Thorsten Guehring, Paul-Alfred Grützner, Marc Schnetzke
PURPOSE: To evaluate the histologic and radiographic outcomes of using silicate-substituted calcium phosphate (Si-CaP) as bone graft substitute for the augmentation of tunnel defects in 2-stage revision anterior cruciate ligament (ACL) reconstruction. METHODS: Forty patients undergoing 2-stage revision ACL reconstruction were included in a prospective, randomized controlled clinical trial between 2012 and 2015. The inclusion criteria were tunnel diameter of the tibial and/or femoral tunnel of 10 mm or greater after failed ACL reconstruction...
December 30, 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/27987674/biodegradable-ceramic-polymer-composites-for-biomedical-applications-a-review
#20
REVIEW
Michal Dziadek, Ewa Stodolak-Zych, Katarzyna Cholewa-Kowalska
The present work focuses on the state-of-the-art of biodegradable ceramic-polymer composites with particular emphasis on influence of various types of ceramic fillers on properties of the composites. First, the general needs to create composite materials for medical applications are briefly introduced. Second, various types of polymeric materials used as matrices of ceramic-containing composites and their properties are reviewed. Third, silica nanocomposites and their material as well as biological characteristics are presented...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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