Studies on Non-Quenched Calcium Phosphate Cement: Influences of Quenching and Milling on Setting Characteristic

2007 ◽  
Vol 330-332 ◽  
pp. 39-42 ◽  
Author(s):  
Xue Jiang Wang ◽  
Yu Bao Li ◽  
John A. Jansen ◽  
Shi Hong Li ◽  
Joop G.C. Wolke
Keyword(s):  
Particle Size ◽  
Calcium Phosphate ◽  
Surface Area ◽  
Calcium Phosphate Cement ◽  
Tricalcium Phosphate ◽  
Hydrated Layer ◽  
Initial Setting

The aim of this study is to explore the effects of quenching and milling processing on setting property of calcium phosphate cement (CPC). For this purpose, non-quenched α-tricalcium phosphate (α-TCP) and quenched α-TCP were synthesized and their corresponding cement systems were prepared. The particle size of α-TCP powder was introduced as a variable. Then, setting properties of these CPC systems were estimated. By a comparison between non-quenched CPC and the quenched one, it is found that milling processing mainly influences the initial setting stage by decreasing reactant particle size whereas the quenching treatment affects the final setting stage by changing α-TCP content, which supports that CPC setting initially depends on the surface area of reactants and subsequently on the diffusion through the hydrated layer formed around the reactants.

Injectability of a Macroporous Calcium Phosphate Cement

2005 ◽  
Vol 284-286 ◽  
pp. 157-160 ◽  
Author(s):  
J.A. Delgado ◽  
I. Harr ◽  
Amisel Almirall ◽  
Sergio del Valle ◽  
Josep A. Planell ◽  
...  
Keyword(s):  
Particle Size ◽  
Calcium Phosphate ◽  
Calcium Phosphate Cement ◽  
Tricalcium Phosphate ◽  
Extrusion Process ◽  
X Ray Diffraction ◽  
Foaming Agent ◽  
X Ray ◽  
Ir Analysis ◽  
Hydrolysis Of

In this work an injectable and self setting calcium phosphate/albumen foam is developed. The effect of both the amount of albumen and the particle size of the starting a-tricalcium phosphate (a-TCP) powder on the injectability of the cement paste is studied. X-ray diffraction (XRD) and infrared (IR) analysis of the samples reveal that the hydrolysis of a-TCP to calcium deficient hydroxyapatite (CDHA) is not affected by the addition of albumen. A foamed structure formed by spherical pores with diameters between 100 and 500 µm is observed by SEM. This porous structure is maintained after injection of the paste, although some deformation of the pores is produced due to the extrusion process. The injectability of the cements is increased by the presence of albumen as compared with cements prepared in the same conditions but without foaming agent.

Synthesis and Properties of α-Tricalcium Phosphate from Amorphous Calcium Phosphate as Component for Bone Cements

2016 ◽  
Vol 721 ◽  
pp. 182-186
Author(s):  
Zilgma Irbe ◽  
Dagnija Loca ◽  
Agnese Pura ◽  
Liga Berzina-Cimdina
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Calcium Phosphate ◽  
Bone Defect ◽  
Tricalcium Phosphate ◽  
Amorphous Calcium Phosphate ◽  
Heat Treating ◽  
Bone Cements ◽  
Important Ingredient ◽  
Reactive Particles

α-Tricalcium phosphate is an important ingredient of calcium phosphate bone cements, which are used for bone defect augmentation and repair. In this study sub-micrometre sized α­tricalcium phosphate particles were synthesized by heat treating amorphous calcium phosphate. Size of synthesized particles depended on duration and temperature of heat treatment. Longer duration and higher temperatures produced larger particles. The reactivity of synthesized particles did not correlate with particle size – the smallest particles did not have the highest reactivity. The most reactive particles were prepared at 700-800 °C. The prepared particles were more reactive than those of conventionally synthesized α-tricalcium phosphate.

Stearate Salts as Brushite Bone Cement Setting Retardants

2005 ◽  
Vol 284-286 ◽  
pp. 19-22 ◽  
Author(s):  
M.P. Hofmann ◽  
Uwe Gbureck ◽  
Liam M. Grover ◽  
J.E. Barralet
Keyword(s):  
Compressive Strength ◽  
Calcium Phosphate ◽  
Bone Cement ◽  
Calcium Phosphate Cement ◽  
Tricalcium Phosphate ◽  
Sodium Stearate ◽  
Setting Times ◽  
Powder Component ◽  
Cement System ◽  
Cement Setting

This study sought to examine the efficiency of coating cement powder reactants in order to reduce the solubility rate of reactants and thereby increase setting times of cement systems. In this investigation magnesium and sodium stearate salts were used to coat the highly soluble monocalcium phosphate monohydrate (MCPM) powder component of a hydraulic brushite forming calcium phosphate cement system with b-tricalcium phosphate (b-TCP) as other component. The results showed that stearate coating of the MCPM reactant could lead to a 100% increase in setting and working times without affecting compressive strength of the set cement when applied with the appropriate P/L-ratio.

Preparation of Tetracalcium Phosphate and the Effect on the Properties of Calcium Phosphate Cement

2009 ◽  
Vol 610-613 ◽  
pp. 1356-1359 ◽  
Author(s):  
Dan Kai ◽  
Hong Song Fan ◽  
Dong Xiao Li ◽  
Xiang Dong Zhu ◽  
Xing Dong Zhang
Keyword(s):  
Particle Size ◽  
Calcium Phosphate ◽  
Calcium Phosphate Cement ◽  
Preparation Method ◽  
Precipitation Method ◽  
Improve Performance ◽  
Solid Reaction ◽  
Tetracalcium Phosphate ◽  
Fast Cooling ◽  
Co Precipitation

In the present study, three types of tetracalcium phosphate (TTCP) were prepared by solid-solid reaction or co-precipitation method and by different cooling modes. The effect of TTCP on the performance of calcium phosphate cement (CPC) was investigated. The result showed that the characteristic of TTCP varied with preparation method and played an important role in CPC performance. A solid-solid reacted TTCP yielded smaller particle size and resulted in bad workability and mechanical strength of CPC. The fast cooling of sintering TTCP by liquid nitrogen could avoid the decomposition of TTCP and make pure TTCP. TTCP prepared by wet-precipitation could improve performance of CPC and was promising to optimization of CPC.

Fully-Interconnected Pore Forming Calcium Phosphate Cement

2011 ◽  
Vol 493-494 ◽  
pp. 832-835 ◽  
Author(s):  
Ishikawa Kunio ◽  
Kanji Tsuru ◽  
Trung Kien Pham ◽  
Michito Maruta ◽  
Shigeki Matsuya
Keyword(s):  
Calcium Phosphate ◽  
Porous Structure ◽  
Calcium Phosphate Cement ◽  
Tricalcium Phosphate ◽  
Porous Body ◽  
Phosphate Solution ◽  
Dicalcium Phosphate Dihydrate ◽  
Phosphate Dihydrate ◽  
Bone Defect Reconstruction ◽  
Interconnected Pore

Calcium phosphate cement that foams fully-interconnected porous structure along with its gradual replacement to bone may be ideal for bone defect reconstruction. In the present study, α-tricalcium phosphate (αTCP) microspheres were exposed to acidic calcium phosphate solution. It was found that the αTCP microspheres set in approximately 10 min to form fully-interconnected porous structure. The porosity was approximately 50% and the pore size was 300µm. The surface of the porous body was dicalcium phosphate dihydrate whereas the inside was αTCP.

Bimodal Porous β-TCP Ceramics and its Dissolution in Phosphate Buffer Saline

2006 ◽  
Vol 309-311 ◽  
pp. 1055-1058
Author(s):  
Yin Zhang ◽  
Yoshiyuki Yokogawa ◽  
Tetsuya Kameyama
Keyword(s):  
Particle Size ◽  
Calcium Phosphate ◽  
Surface Area ◽  
Phosphate Buffer ◽  
Calcium Content ◽  
Porous Ceramics ◽  
Phosphate Buffer Saline ◽  
Porous Bodies ◽  
Special Surface ◽  
Ft Ir

Two kinds of tri-calcium phosphate ceramics, β-TCP, which have the same macrostructure and microstructure, but different special surface area and particle size, were used in porous ceramics. A slip was obtained by adding the powders to a solution 1.0 wt% of deflocculant, respectively. The specimen obtained by casting a polyurethane foam with 0.5wt% into a slip, and drying it under vacuum, was heated at 1150, for 3 hours. The porous ceramics samples about 0.5g were individually soaked into 30 mL of phosphate buffer saline (PBS) at 20 for 1,3,7 and 10 days, respectively. The calcium content of the PBS solution was analyzed by (ICP). The porous bodies were filtered, dried, and characterized using SEM, XPD, and FT-IR.

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