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Silicate Calcium Phosphate

Raúl Rodríguez-Gómez, Gunno Renman
The phosphorus (P) and BOD7 removal performance of an upflow packed bed reactor (PBR) filled with two reactive filter media was studied over 50 weeks. The lower one-fifth of the reactor was filled with calcium-silicate-hydrate (Sorbulite®) and the upper four-fifth with calcium-silicate (Polonite®). A laboratory-scale upflow anaerobic sludge bed reactor (UASB) delivered wastewater to the PBR. A model was developed to describe the gradient in P concentration change in the reactor, based on reaction kinetics...
October 18, 2016: Environmental Technology
Marjan Alimi, Rodrigo Navarro-Ramirez, Karishma Parikh, Innocent Njoku, Christoph P Hofstetter, Apostolos J Tsiouris, Roger Härtl
STUDY DESIGN: Retrospective cohort study. OBJECTIVE: To evaluate the radiographic and clinical outcome of silicate-substituted calcium phosphate (Si-CaP), utilized as a graft substance in spinal fusion procedures. SUMMARY OF BACKGROUND DATA: Specific properties of Si-CaP provide the graft with negative surface charge that can result in a positive effect on the osteoblast activity and neovascularization of the bone. METHODS: This study included those patients who underwent spinal fusion procedures between 2007 and 2011 in which Si-CaP was used as the only bone graft substance...
September 10, 2016: Clinical Spine Surgery
Sudhanshu Shekhar, Abhijit Roy, Daeho Hong, Prashant N Kumta
Nanostructured ceramic particles, particularly, nanoparticles of calcium phosphate (CaP) remain an attractive option among the various types of non-viral gene delivery vectors studied because of their safety, biocompatibility, biodegradability, and ease of handling as well as their adsorptive capacity for DNA. We have accordingly developed an enhanced version of nanostructured calcium phosphates (NanoCaPs), by substituting known amounts of silicate for phosphate in the hydroxyapatite (HA) lattice (NanoSiCaPs)...
December 1, 2016: Materials Science & Engineering. C, Materials for Biological Applications
Aijun Yao, Yani Wang, Xiaodan Ling, Zhe Chen, Yetao Tang, Hao Qiu, Rongrong Ying, Rongliang Qiu
Economic and highly effective methods of in situ remediation of Cd and As polluted farmland in mining areas are urgently needed. Pot experiments with Brassica chinensis L. were carried out to determine the effects of three soil amendments [a novel iron-silicon material (ISM), a synthetic zeolite (SZ) and an alkaline clay (AC)] on vegetable uptake of As and Cd. SEM-EDS and XRD analyses were used to investigate the remediation mechanisms involved. Amendment with ISM significantly reduced the concentrations of As and Cd in edible parts of B...
August 16, 2016: Environmental Geochemistry and Health
Issam Khalil, Alfred Naaman, Josette Camilleri
INTRODUCTION: Sealers based on tricalcium silicate cement aim at an interaction of the sealer with the root canal wall, alkalinity with potential antimicrobial activity, and the ability to set in a wet field. The aim of this study was to characterize and investigate the properties of a new tricalcium silicate-based sealer and verify its compliance to ISO 6876 (2012). METHODS: A new tricalcium silicate-based sealer (Bio MM; St Joseph University, Beirut, Lebanon), BioRoot RCS (Septodont, St Maure de Fosses, France), and AH Plus (Dentsply, DeTrey, Konstanz, Germany) were investigated...
October 2016: Journal of Endodontics
T Sopcak, L Medvecky, M Giretova, A Kovalcikova, R Stulajterova, J Durisin
Self-setting simple calcium silicate/brushite (B) biocements with various Ca/P ratios were prepared by mutual mixing of both monocalcium silicate hydrate (CSH) or β-wollastonite (woll) powders with B and the addition of 2 wt% NaH2PO4 solution as a hardening liquid. The phase composition of the final composites and the texture of the surface calcium phosphate/silica layer were controlled by the starting Ca/P ratio in composites and the pH during setting. It was verified that the presence of continuous bone-like calcium phosphate coating on the surface of the samples was not essential for in vitro osteoblast proliferation...
2016: Biomedical Materials
Kenneth K Hansraj
INTRODUCTION: Spine surgeons are embracing advanced biologic technologies in an attempt to help millions of people achieve a better outcome in spine surgery. These new technologies may be complicated to understand, partly because the contribution of different types of cells has not been definitively identified. This paper describes the characteristics of the stem cells used in spine surgery, including their actions and possible complications. The description necessitates an overview of all studies to date on the use of stem cells in spine surgery, as well as other cells used in cellular therapy...
July 29, 2016: Surgical Technology International
Kamia Punia, Michael Bucaro, Andrew Mancuso, Christina Cuttitta, Alexandra Marsillo, Alexey Bykov, William L'Amoreaux, Krishnaswami S Raja
The classic chemical garden experiment is reconstructed to produce protein-intercalated silicate-phosphate tubules that resemble tubular sponges. The constructs were synthesized by seeding calcium chloride into a solution of sodium silicate-potassium phosphate and gelatin. Sponge-mimetic tubules were fabricated with varying percentages of gelatin (0-15% w/v), in diameters ranging from 200 μm to 2 mm, characterized morphologically and compositionally, functionalized with biomolecules for cell adhesion, and evaluated for cytocompatibility...
August 30, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
Bradley K Weiner, Paige E Vargo
No abstract text is available yet for this article.
September 1, 2016: Spine
Tianxing Gong, Yadong Chen, Yixi Zhang, Yubiao Zhang, Xinwei Liu, Tom Troczynski, Urs O Häfeli
Osteoporosis greatly impairs bone fracture restoration with bone cement because the accelerated resorption decreases the osseointegration between bone and implants. In this study, we designed a new drug delivery system based on the third generation bisphosphonate risedronate (RA) and the osteogenic calcium phosphate silicate cement (CPSC). The impact of RA on CPSC's material properties and microstructure was evaluated by different characterization methods (μCT, XRD, FTIR, SEM and gas sorption). In addition, in vitro biocompatibility of RA-added CPSC was evaluated (MTT assay, flow cytometry, real-time PCR)...
2016: Biomedical Materials
Kern Singh, Sreeharsha V Nandyala, Alejandro Marquez-Lara, Steven J Fineberg, Miguel Pelton
No abstract text is available yet for this article.
September 1, 2016: Spine
Bahram Ranjkesh, Jacques Chevallier, Hamideh Salehi, Frédéric Cuisinier, Flemming Isidor, Henrik Løvschall
Aim: Calcium silicate cements are widely used in endodontics. Novel fast-setting calcium silicate cement with fluoride (Protooth) has been developed for potential applications in teeth crowns including cavity lining and cementation. Objective: To evaluate the surface apatite-forming ability of Protooth compositions as a function of fluoride content and immersion time in phosphate-buffered saline (PBS). Material and methods: Three cement compositions were tested: Protooth (3.5% fluoride and 10% radiocontrast), ultrafast Protooth (3...
January 1, 2016: Acta Biomaterialia Odontologica Scandinavica
Seyed-Iman Roohani-Esfahani, Young Jung No, Zufu Lu, Pei Ying Ng, Yongjuan Chen, Jeffrey Shi, Nathan J Pavlos, Hala Zreiqat
Bioceramics for regenerative medicine applications should have the ability to promote adhesion, proliferation and differentiation of osteoblast and osteoclast cells. Osteogenic properties of the material are essential for rapid bone regeneration and new bone formation. The aim of this study was to develop a silicate-based ceramic, gehlenite (GLN, Ca2Al2SiO7), and characterise its physiochemical, biocompatibility and osteogenic properties. A pure GLN powder was synthesised by a facile reactive sintering method and compacted to disc-shaped specimens...
2016: Biomedical Materials
Emmanuel Jnl Silva, Nancy Kudsi Carvalho, Mayara Zanon, Plínio Mendes Senna, Gustavo DE-Deus, Mário Luis Zuolo, Alexandre Augusto Zaia
This study was designed to investigate the resistance to dislodgment provided by MTA HP, a new high-plasticity calcium silicate-based cement. Biodentine and White MTA Angelus were used as reference materials for comparison. Three discs 1 ± 0.1 mm thick were obtained from the middle third of the roots of 5 maxillary canines. Three 0.8-mm-wide holes were drilled on the axial surface of each root disc. Standardized irrigation was performed. Then the holes were dried with paper points and filled with one of the three tested cements...
June 14, 2016: Brazilian Oral Research
N K Carvalho, M C Prado, P M Senna, A A Neves, E M Souza, S R Fidel, L M Sassone, E J N L Silva
AIM: To evaluate the effect of 17% ethylenediaminetetracetic acid (EDTA), 2.25% Peracetic Acid (PA) or 10% Citric Acid (CA) on the push-out bond strength of calcium-silicate based endodontic sealers [MTA Fillapex (Angelus, Londrina, Brazil) and Total Fill BC Sealer (FKG, La Chaux-de-Fonds, Switzerland)] to root dentine after different periods of immersion in phosphate-buffered saline (PBS). AH Plus (Dentsply DeTrey, Konstaz, Germany) was used as a reference material for comparison. METHODOLOGY: Thirty human maxillary incisors were selected and three 1-mm discs were obtained from the middle third of each root...
May 23, 2016: International Endodontic Journal
Mostafa Mabrouk, Yahya E Choonara, Thashree Marimuthu, Pradeep Kumar, Lisa C du Toit, Sandy van Vuuren, Viness Pillay
The aim of this study was to develop an in situ hybridized poly(vinyl alcohol)/calcium silicate (PVA/Ca2OSi) nanofibrous antibacterial wound dressing with calcium phosphate [Ca3(PO4)2] surface precipitation for enhanced bioactivity. This was achieved by hybridizing the antibacterial ions Zn(2+) and/or Ag(+) in a Ca2O4Si composite. The hybridization effect on the thermal behavior, physicochemical, morphological, and physicomechanical properties of the nanofibers was studied using Differential Scanning calorimetric (DSC), X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Textural Analysis, respectively...
June 30, 2016: International Journal of Pharmaceutics
Gustavo De-Deus, Caroline Baptista Ferreira, Diogo da Silva Oliveira, Thais Fernandes de Queiroz, Erick Miranda Souza, Cresus Vinicius Depes de Gouvêa, Emmanuel João Nogueira Leal Silva
PURPOSE: To investigate the resistance to dislodgment produced by Biodentine (Septodont) and White-MTA (Angelus) after immersion in phosphate-buffered saline (PBS) for different durations. MATERIALS AND METHODS: Dentin disks 1 ± 0.1 mm thick were obtained from the middle third of the roots of 6 human maxillary canines. On the coronal surface of each dentin disk, four 0.8-mm-diameter holes were drilled. Then the slices were halved using a low-speed saw diamond disk, and the two holes in each half were filled with one of the two tested materials...
2016: Journal of Adhesive Dentistry
Masanobu Kamitakahara, Eri Tatsukawa, Yasuaki Shibata, Shota Umemoto, Taishi Yokoi, Koji Ioku, Tohru Ikeda
In addition to calcium phosphate-based ceramics, glass-based materials have been utilized as bone substitutes, and silicate in these materials has been suggested to contribute to their ability to stimulate bone repair. In this study, a silicate-containing α-tricalcium phosphate (α-TCP) ceramic was prepared using a wet chemical process. Porous granules composed of silicate-containing α-TCP, for which the starting composition had a molar ratio of 0.05 for Si/(P + Si), and silicate-free α-TCP were prepared and evaluated in vivo...
May 2016: Journal of Materials Science. Materials in Medicine
Aline Costenoble, Elsa Vennat, Jean-Pierre Attal, Elisabeth Dursun
OBJECTIVE:  To investigate the shear bond strength (SBS) of orthodontic brackets bonded to eroded enamel treated with preventive approaches and to examine the enamel/bracket interfaces. MATERIALS AND METHODS:  Ninety-one brackets were bonded to seven groups of enamel samples: sound; eroded; eroded+treated with calcium silicate-sodium phosphate salts (CSP); eroded+infiltrated by ICON(®); eroded+infiltrated by ICON(®) and brackets bonded with 1-month delay; eroded+infiltrated by an experimental resin; and eroded+infiltrated by an experimental resin and brackets bonded with 1-month delay...
November 2016: Angle Orthodontist
Jing Zhang, Huiming Wang, Jue Shi, Ying Wang, Kaichen Lai, Xianyan Yang, Xiaoyi Chen, Guoli Yang
The present study was performed to determine whether simvastatin improves bone regeneration when combined with calcium silicate/gypsum and gelatin (CS-GEL). The surface morphology was determined using field-emission scanning electron microscopy (FSEM). Degradation in vitro was evaluated by monitoring the weight change of the composites soaked in phosphate buffered saline (PBS). Drug release was evaluated using high-performance liquid chromatography (HPLC). Cytotoxicity testing was performed to assess the biocompatibility of composites...
2016: Scientific Reports
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