scholarly journals TRANSITORY NATURE OF OCTACALCIUM PHOSPHATE IN PHYSIOLOGICAL MILIEU AND ITS OSTEOCONDUCTIVE PROPERTY

2009 ◽  
Vol 23 ◽  
pp. 31-34
Author(s):  
Osamu Suzuki
Keyword(s):  
Octacalcium Phosphate ◽  
Osteoconductive Property

Osteoconductive Property of a Mechanical Mixture of Octacalcium Phosphate and Amorphous Calcium Phosphate

2014 ◽  
Vol 6 (24) ◽  
pp. 22602-22611 ◽  
Author(s):  
Kazuhito Kobayashi ◽  
Takahisa Anada ◽  
Takuto Handa ◽  
Naofumi Kanda ◽  
Mariko Yoshinari ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Amorphous Calcium Phosphate ◽  
Octacalcium Phosphate ◽  
Mechanical Mixture ◽  
Osteoconductive Property

Osteoconductivity of Titania Films Prepared by Electron-Cyclotron-Resonance Plasma Oxidation of Implant Titanium

2007 ◽  
Vol 361-363 ◽  
pp. 717-720
Author(s):  
Hiroshi Masumoto ◽  
Takashi Goto ◽  
Yusuke Orii ◽  
Yoshitomo Honda ◽  
Osamu Suzuki ◽  
...  
Keyword(s):  
Tio2 Film ◽  
Cyclotron Resonance ◽  
Electron Cyclotron Resonance ◽  
Substrate Surface ◽  
Octacalcium Phosphate ◽  
Electron Cyclotron ◽  
Plasma Oxidation ◽  
Ecr Plasma ◽  
Structure Morphology ◽  
Osteoconductive Property

Surface titanium oxide (TiO2) films were fabricated on implant titanium (Ti) at low temperatures by electron-cyclotron-resonance (ECR) plasma oxidation. The relationship among the oxidization conditions, crystal structure, morphology and osteoconductive property were investigated. Although crystallized TiO2 film was not prepared by thermal oxidation at 300°C, crystallized rutile-type TiO2 film was formed by ECR plasma oxidation at 300°C. Rough morphology was observed in the substrate surface oxidized by ECR plasma. Mixtures of octacalcium phosphate (OCP) and dicalcium phosphate dihydrate (DCPD) were observed after calcification. The XRD peak intensities of the OCP and DCPD formed on the ECR plasma oxidized Ti were larger than those of calcified on the thermal oxidized Ti. ECR plasma oxidation at low temperature would induce osteoconductive calcium phosphate on implant Ti.

Implantation of octacalcium phosphate enhances alveolar ridge in rat mandible

2013 ◽  
Author(s):  
Aval Fereydoon Sargolzaei ◽  
Mohammad Reza Arab ◽  
Aval Forough Sargolzaei
Keyword(s):  
Octacalcium Phosphate ◽  
Alveolar Ridge ◽  
Rat Mandible

Bioresorption and biodegradation of the 3D-printed gene-activated bone substitutes based on octacalcium phosphate

2020 ◽  
Vol XV (1) ◽  
Author(s):  
E. Presnyakov ◽  
I. Bozo ◽  
I. Smirnov ◽  
V. Komlev ◽  
V. Popov ◽  
...  
Keyword(s):  
Bone Substitutes ◽  
Octacalcium Phosphate ◽  
3D Printed

scholarly journals Prediction of Sodium Substitution Sites in Octacalcium Phosphate: The Relationships of Ionic Pair Ratios in Reacting Solutions

Ceramics ◽  
2021 ◽  
Vol 4 (2) ◽  
pp. 240-248
Author(s):  
Yuki Sugiura ◽  
Masanori Horie
Keyword(s):  
Dicarboxylic Acid ◽  
Experimental Studies ◽  
Ionic Species ◽  
Octacalcium Phosphate ◽  
Pair Formation ◽  
Formation Processes ◽  
Ionic Pair ◽  
Substitution Process ◽  
Sodium Substitution ◽  
Acidic Conditions

Octacalcium phosphate (OCP) is widely used in biomaterial fabrication by virtue of its unique crystal structure and low environmental loading. Although various ion and molecule substitution methods into the OCP unit lattice have been introduced, it remains unclear which factors and mechanisms dominate the substitution process. Experimental studies have indicated that Na alkali metal ions are substituted at the P3 PO4 conjugated site in acidic to weakly acidic conditions and the P5 PO4 conjugated site in neutral to weak basic conditions. Ionic species calculation methods have indicated that the pair ratios of Na and HPO42− (NaHPO4−) are small in acidic reacting solutions but large under weakly basic conditions. Consequently, the roles played by NaHPO4− and ionic pair formation processes are thought to dominate ion and molecule substitution into the OCP unit lattice. Such ionic pair formation strongly inhibits dicarboxylic acid substitution into the OCP unit lattice due to the replacement of the Ca ion, which conjugates P5 PO4 as an anchor of dicarboxylic acid.

Coherent surface structure induces unique epitaxial overgrowth of metastable octacalcium phosphate on stable hydroxyapatite at critical fluoride concentration

2021 ◽  
Vol 125 ◽  
pp. 333-344
Author(s):  
Kazuo Onuma ◽  
Mari M. Saito ◽  
Yasuo Yamakoshi ◽  
Mayumi Iijima ◽  
Yu Sogo ◽  
...  
Keyword(s):  
Surface Structure ◽  
Fluoride Concentration ◽  
Octacalcium Phosphate

scholarly journals Microwave-Assisted Fabrication of Mesoporous Silica-Calcium Phosphate Composites for Dental Application

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 53
Author(s):  
Adrian Szewczyk ◽  
Adrianna Skwira ◽  
Marta Ginter ◽  
Donata Tajer ◽  
Magdalena Prokopowicz
Keyword(s):  
Calcium Phosphate ◽  
Mesoporous Silica ◽  
Octacalcium Phosphate ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Coating Solution ◽  
X Ray ◽  
Microwave Assisted ◽  
Calcium Orthophosphates ◽  
Different Types

Herein, the microwave-assisted wet precipitation method was used to obtain materials consisting of mesoporous silica (SBA-15) and calcium orthophosphates (CaP). Composites were prepared through immersion of mesoporous silica in different calcification coating solutions and then exposed to microwave radiation. The composites were characterized in terms of molecular structure, crystallinity, morphology, chemical composition, and mineralization potential by Fourier-transform infrared spectroscopy (FTIR), powder X-ray diffraction (XRD), and scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy (SEM-EDX). The application of microwave irradiation resulted in the formation of different types of calcium orthophosphates such as calcium deficient hydroxyapatite (CDHA), octacalcium phosphate (OCP), and amorphous calcium phosphate (ACP) on the SBA-15 surface, depending on the type of coating solution. The composites for which the progressive formation of hydroxyapatite during incubation in simulated body fluid was observed were further used in the production of final pharmaceutical forms: membranes, granules, and pellets. All of the obtained pharmaceutical forms preserved mineralization properties.

Effect of pH of coating solution on the adhesion strength and corrosion resistance of hydroxyapatite and octacalcium phosphate coated WE43 alloy

2021 ◽  
pp. 088532822110125
Author(s):  
Tuyet Thi Anh Ngo ◽  
Sachiko Hiromoto ◽  
Linh Chi Do ◽  
Hanh Hong Pham ◽  
Le Hanh
Keyword(s):  
Corrosion Resistance ◽  
Adhesion Strength ◽  
Corrosion Current ◽  
Xrd Analysis ◽  
Octacalcium Phosphate ◽  
Solution Deposition ◽  
Chemical Solution Deposition Method ◽  
Before And After ◽  
Coating Layers ◽  
We43 Alloy

Hydroxyapatite (HAp) and octacalcium phosphate (OCP) layers were formed on Mg- 4mass% Y- 3mass% rare earth (WE43) alloy by a chemical solution deposition method at various pH values of pH 5.5, 6.2, 7.5, and 8.6. Adhesion strength of HAp and OCP layers was evaluated before and after immersing in a medium for 14 days by a pull-off test. The corrosion resistance of these coatings was measured by polarization tests performed in a simulated body fluid (SBF). XRD analysis demonstrated that HAp coating layers were formed at pH 7.5 and 8.6, while OCP coating layers were formed at pH 5.5 and 6.2. Adhesion test results showed that the as-coated pH7.5-HAp layer had the highest adhesion strength of 8.6 MPa, which was attributed to the very dense structure of the coating layer. The as-coated pH8.6-HAp layer showed the adhesion strength of 6.5 MPa. The adhesion strength of the as-coated pH5.5- and pH6.2-OCP layers was 3.9 and 7.1 MPa, respectively, that was governed by the thick and fragile property of the layers. After immersing in the medium for 14 days, the adhesion strength of pH7.5- and pH8.6-specimens decreased to 5.8 and 5.6 MPa, respectively. The pitting corrosion and formation of Mg(OH)2 under the HAp layers were responsible for the decrease of adhesion strength. The polarization tests in SBF at 37 °C showed that the corrosion current density decreased with the HAp and OCP coatings, indicating the improvement of the corrosion resistance of WE43 alloy. The HAp coatings improved the corrosion resistance more efficiently than the OCP coatings.

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