reactivity of a wollastonite tricalcium phosphate

Controlling the reactivity of calcium phosphate cements

The effect of composition on the reactivity of a calcium phosphate cement (CPC) consisting of tricalcium phosphate (TCP)– water mixtures was investigated by isothermal calorimetry at 37 °C. The parameters of interest were the mean particle size of the powder the use of small amounts of hydroxyapatite nanoparticles as nucleating agent the phosphate concentration and the pH of the

Reactivity of α-tricalcium phosphate SpringerLink

Mar 01 2002 · The reactivity of α-tricalcium phosphate (α-TCP) in forming hydroxyapatite (HAp) at 37°C was investigated. The effects of synthesis route HAp seeding and the presence of calcium salts on the mechanism and extent of HAp formation were examined by pH measurements and/or isothermal calorimetric analyses. A synthesis temperature at the lower end in the temperature range of

Tricalcium phosphateWikipedia

Tricalcium phosphate (sometimes abbreviated TCP) is a calcium salt of phosphoric acid with the chemical formula Ca 3 (PO 4) 2 is also known as tribasic calcium phosphate and bone phosphate of lime (BPL) is a white solid of low solubility. Most commercial samples of "tricalcium phosphate" are in fact hydroxyapatite.. It exists as three crystalline polymorphs α α and β.

USAReactive tricalcium phosphate compositions

Methods for producing a room temperature stable phase pure α-C 3 P product and compositions derived therefrom are provided. In the subject method a tricalcium phosphate source is heated to a temperature sufficient to convert substantially all of said tricalcium phosphate source to a substantially phase pure α-C 3 P product. The temperature of the resultant product is rapidly cooled to a

Influence of Si substitution on the reactivity of α

Jun 01 2017 · 1. Mater Sci Eng C Mater Biol Appl. 2017 Jun 175 . doi 10.1016/j.msec.2017.02.099. Epub 2017 Feb 24. Influence of Si substitution on the reactivity of α-tricalcium phosphate.

(PDF) Correlating Crystallinity and Reactivity in an α

However the use of conventional synthesis methods e.g. solid state reactions brings great difficulty to the obtainment of highly pure α-tricalcium phosphate phase.

A physical approach to modify the hydraulic reactivity of

AIME 38 Tang RK Wu WJ Haas M Nancollas GH. Kinetics of dissolution of Trans 169–78. beta-tricalcium phosphate. Langmuir 200117(11) 3480–5. Please cite this article in press as Bohner M et al. A physical approach to modify the hydraulic reactivity of a-tricalcium phosphate powder.

Phase Diagram of Wollastonite—Tricalcium PhosphateAza

A study of the system CaO·SiO 2 (CS)‐3CaO·P 2 O 5 (TCP) was conducted as a preliminary step toward obtaining polycrystalline wollastonite–tricalcium phosphate bioceramics. The results showed that the system is a true binary with an invariant point at 1402 ± 3°C

Phase Diagram of Wollastonite—Tricalcium PhosphateAza

A study of the system CaO·SiO 2 (CS)‐3CaO·P 2 O 5 (TCP) was conducted as a preliminary step toward obtaining polycrystalline wollastonite–tricalcium phosphate bioceramics. The results showed that the system is a true binary with an invariant point at 1402 ± 3°C

Glass-Ceramics of the WollastoniteTricalcium Phosphate

Glass-ceramics of eutectic composition in the wollastonite W CaO⋅SiO 2 - tricalcium phosphate TCP β-Ca 3 (PO 4 ) 2 binary system were synthesized by using the glass-crystallization method.

(PDF) Correlating Crystallinity and Reactivity in an α

However the use of conventional synthesis methods e.g. solid state reactions brings great difficulty to the obtainment of highly pure α-tricalcium phosphate phase.

Wollastonite/TCP composites for bone regeneration

Thus associating bioactivity of wollastonite (W) with biodegradability of tricalcium phosphate (TCP) becomes promising for bone repair. Therefore this study investigated through systematic review and meta-analysis in vivo studies that evaluated histomorphometrically the bone repair after implantation of W/TCP composites.

Tricalcium phosphateWikipedia

Tricalcium phosphate (sometimes abbreviated TCP) is a calcium salt of phosphoric acid with the chemical formula Ca 3 (PO 4) 2 is also known as tribasic calcium phosphate and bone phosphate of lime (BPL) is a white solid of low solubility. Most commercial samples of "tricalcium phosphate" are in fact hydroxyapatite.. It exists as three crystalline polymorphs α α and β.

Degradation characteristics of alpha and beta tri-calcium

In seven Goettingen minipigs 3.5--4.7-ml cancellous bone defects were created in the area of the tibial head on both sides. The defects were filled with alpha-TCP or beta-TCP (tricalciumphosphate). ITI implants (Straumann Freiburg Germany) of 3.2 x 12-mm length were inserted into the underlying ce

USAReactive tricalcium phosphate compositions

Methods for producing a room temperature stable phase pure α-C 3 P product and compositions derived therefrom are provided. In the subject method a tricalcium phosphate source is heated to a temperature sufficient to convert substantially all of said tricalcium phosphate source to a substantially phase pure α-C 3 P product. The temperature of the resultant product is rapidly cooled to a

Calcium Phosphate Cement Plus 10 Wollastonite Whiskers

This study aimed to evaluate the biocompatibility and bone neoformation of α-TCP plus 10 wollastonite whiskers in vivo. To obtain the cement α-TCP powders with or without 10 wollastonite whiskers were added to an aqueous solution containing 2.5 by weight of Na2HPO4 (anhydrous bibasic sodium phosphate). The biomaterial then became a paste

Addition of Wollastonite Fibers to Calcium Phosphate

Calcium phosphate cement (CPC) that is based on α -tricalcium phosphate ( α -TCP) is considered desirable for bone tissue engineering because of its relatively rapid degradation properties. However such cement is relatively weak restricting its use to areas of low mechanical stress. Wollastonite fibers (WF) have been used to improve the mechanical strength of biomaterials.

USAReactive tricalcium phosphate compositions

Methods for producing a room temperature stable phase pure α-C 3 P product and compositions derived therefrom are provided. In the subject method a tricalcium phosphate source is heated to a temperature sufficient to convert substantially all of said tricalcium phosphate source to a substantially phase pure α-C 3 P product. The temperature of the resultant product is rapidly cooled to a

Influence of thermal treatment on the "in vitro

De Aza PN Luklinska Z Anseau M Hector M Guitian F De Aza S. Reactivity of a wollastonite-tricalcium phosphate bioeutectic in human parotid saliva. Biomaterials. 200021(17) 1735–41. Article

Reactivity of a wollastonite–tricalcium phosphate

DOI 10.1590/S65 Si-Tricalcium

Keywords calcium phosphate cements tricalcium phosphate wollastonite silicon-doped tricalcium phosphate biomedical application 1. Introduction Ionic substitution into calcium phosphate s crystalline structure has been reported as an important path on the development of orthopedic implants and tissue engineering scaffolds once it is

Controlling the reactivity of calcium phosphate cements

The effect of composition on the reactivity of a calcium phosphate cement (CPC) consisting of tricalcium phosphate (TCP)– water mixtures was investigated by isothermal calorimetry at 37 °C. The parameters of interest were the mean particle size of the powder the use of small amounts of hydroxyapatite nanoparticles as nucleating agent the phosphate concentration and the pH of the

Comparison of Apatite-Wollastonite Glass-Ceramic and E

E -tricalcium phosphate (Poresorb® Lasak Ltd. Prague Czech Republic) in granule form with particle size of 0 6 to 2 mm was implanted. The porosity of the interconnected Ã-tricalcium phosphate scaffold was 35±5 the average macropore size was 100 Ím in diameter the size of micropores was 1-5 Í m and the sintering temperature was 1180 qC.

Wollastonite/TCP composites for bone regeneration

Thus associating bioactivity of wollastonite (W) with biodegradability of tricalcium phosphate (TCP) becomes promising for bone repair. Therefore this study investigated through systematic review and meta-analysis in vivo studies that evaluated histomorphometrically the bone repair after implantation of W/TCP composites.

Effect of thermal treatments on the reactivity of

This study had two aims (i) to determine the effects of calcination temperature on the hydraulic reactivity of three nanosized X-ray amorphous tricalcium phosphate (ATCP) powders and (ii) to try to bring a better understanding of the poor reactivity of α-tricalcium phosphate (α-TCP) nanoparticles obtained by calcining ATCP powders. For those purposes five calcination temperatures were

(PDF) Non-Isothermal Devitrification Study of Wollastonite

In a previous study a new ceramic material (Bioeutectic) prepared by slow solidification through the eutectic temperature region of the wollastonite-tricalcium phosphate system was found to be

Controlling the reactivity of calcium phosphate cements

The effect of composition on the reactivity of a calcium phosphate cement (CPC) consisting of tricalcium phosphate (TCP)– water mixtures was investigated by isothermal calorimetry at 37 °C. The parameters of interest were the mean particle size of the powder the use of small amounts of hydroxyapatite nanoparticles as nucleating agent the phosphate concentration and the pH of the

Si-tricalcium phosphate cement preparation

1. Introduction. Ionic substitution into calcium phosphate s crystalline structure has been reported as an important path on the development of orthopedic implants and tissue engineering scaffolds once it is possible to control material s thermal stability in vivo solubility and cell adhesion and proliferation 1-12.For instance silicon doped Α-tricalcium phosphate (Si-Α-TCP) is receiving

WollastoniteTricalcium Phosphate Glass-Ceramics of

Glass-ceramics of eutectic composition in the wollastonite W CaO⋅SiO 2 - tricalcium phosphate TCP β-Ca 3 (PO 4) 2 binary system were synthesized by using the glass-crystallization method.The parent glass was crystalized at °C for 0.5-5 h. The in vitro bioactivity of the synthesized glass-ceramics was tested in Kokubo s Simulated Body Fluid (SBF) for 7-21 days at pH = 7.4

Reactivity of α-tricalcium phosphate Journal of Materials

Oct 12 2004 · The reactivity of α-tricalcium phosphate (α-TCP) in forming hydroxyapatite (HAp) at 37°C was investigated. The effects of synthesis route HAp seeding and the presence of calcium salts on the mechanism and extent of HAp formation were examined by pH measurements and/or isothermal calorimetric analyses. A synthesis temperature at the lower end in the temperature range of