A thermoanalytical study of synthetic carbonate-containing apatites

Tõnsuaadu, Kaia; Peld, Merike; Leskelä, Tuula; Mannonen, R.; Niinistö, Lauri; Veiderma, Mihkel

doi:10.1016/0040-6031(94)02169-o

Cited by 66 publications

(36 citation statements)

References 8 publications

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“…This is due to the unstableness of CO3Ap at higher temperature. When sintered at temperature higher than 400°C, carbonate is decomposed into other compounds and liberated in air in the form of carbon dioxide 9,10) . Meanwhile, CO3Ap is thermodynamically the most stable among calcium phosphate compounds at neutral and basic condition.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of carbonate apatite block based on internal dissolution-precipitation reaction of dicalcium phosphate and calcium carbonate

et al. 2010

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In this study, we investigated a novel method for fabrication of carbonate apatite block without ionic movement between precursor and solution by using precursor that includes all constituent ions of carbonate apatite. A powder mixture prepared from dicalcium phosphate anhydrous and calcite at appropriate Ca/P ratios (1.5, 1.67, and 1.8) was used as starting material. For preparation of specimens, the slurry made from the powder mixture and distilled water was packed in a split stainless steel mold and heat-treated, ranging from 60°C to 100°C up to 48 hours at 100% humidity. It appeared that carbonate apatite could be obtained above 70°C and monophasic carbonate apatite could be obtained from the powder mixture at Ca/P ratio of 1.67. Carbonate content of the specimen was about 5-7%. Diametral tensile strength of the carbonate apatite blocks slightly decreased with increasing treatment temperature. The decrease in diametral tensile strength is thought to be related to the crystal size of the carbonate apatite formed.

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Section: Introductionmentioning

confidence: 99%

Fabrication of carbonate apatite block based on internal dissolution-precipitation reaction of dicalcium phosphate and calcium carbonate

et al. 2010

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“…4(f)). Set gypsum showed absorption bands in three wave number regions, namely, 1700-1600cm −1 , 1200-1100 cm −1 , and 700-600 cm −1 , which were assigned to bending vibration of H2O molecule, stretching vibration and bending vibration of SO 4 2− respectively [19][20][21] (Fig. 4(a)).…”

Section: Resultsmentioning

confidence: 99%

“…Compared with HAp, PO4 3− absorption peaks of specimens treated at 100, 120 and 160°C were broadened toward higher wave numbers. This could be caused by the absorption band of SO 4 2− . Effects of sulfate incorporation into CO3Ap structure on tissue response, osteoconductivity and bone replacement have not been studied yet.…”

Section: Discussionmentioning

confidence: 99%

“…Unfortunately, sintering is not suitable for the fabrication of CO 3Ap blocks due to low thermal stability of CO3Ap at high temperatures. At 400°C, CO3Ap begins to decompose and pronounced thermal decomposition occurs at 600-700°C 4,5) . An alternative method was proposed for the fabrication of CO3Ap blocks by dissolution-precipitation reaction based on an artificially fabricated precursor 6) .…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of carbonate apatite blocks from set gypsum based on dissolutionprecipitation reaction in phosphate-carbonate mixed solution

et al. 2014

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Carbonate apatite (CO 3 Ap), fabricated by dissolution-precipitation reaction based on an appropriate precursor, is expected to be replaced by bone according to bone remodeling cycle. One of the precursor candidates is gypsum because it shows self-setting ability, which then enables it to be shaped and molded. The aim of this study, therefore, was to fabricate CO 3 Ap blocks from set gypsum. Set gypsum was immersed in a mixed solution of 0.4 mol/L disodium hydrogen phosphate (Na 2 HPO 4 ) and 0.4 mol/L sodium hydrogen carbonate (NaHCO 3 ) at 80-200°C for 6-48 h. Powder X-ray diffraction patterns and Fourier transform infrared spectra showed that CO 3 Ap block was fabricated by dissolution-precipitation reaction in Na 2 HPO 4 -NaHCO 3 solution using set gypsum in 48 h when the temperature was 100°C or higher. Conversion rate to CO 3 Ap increased with treatment temperature. CO 3 Ap block containing a larger amount of carbonate was obtained when treated at lower temperature.

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“…The absorption bands at 550~600 cm -1 and 1000-1100 cm -1 were attributed to the phosphate ions. 2,11,12 From XRD and FT-IR, no significant differences were found between the CA samples sintered at various temperatures in carbon dioxide.…”

Section: ) Characterization Of Camentioning

confidence: 99%

Sintering and Osteoclast Behavior of Carbonate Apatite Ceramics

Watarai

Nakamura

Horiuchi

et al. 2012

Phosphorus Research Bulletin

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B-type carbonate apatite (CA) substituting for phosphate ions, is the major inorganic components of vertebrate bones. CA is more biodegradable than HA and has been expected as a next generation biomaterial. We had reported that the polarized HA could promote bone healing. The purpose of this study was to investigate the effects of the electrically polarization on CA characterization. CA synthesized by wet method was sintered at various temperatures in carbon dioxide atmosphere. The TG measurement and polarization treatment of the sintered CA were performed. From the results of XRD and FT-IR analyses, CA was inclusion of contain carbonate about 5wt%. From TSDC measurement, the quantity of accumulated charges of CA was larger than HA. In addition, we evaluated the osteoclast behaviors on non-polarized CA and polarized CA. From the observation of cell morphology, there were multinucleated cells having actin ring structures specific for the activated osteoclasts on the CA surfaces.

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A thermoanalytical study of synthetic carbonate-containing apatites

Cited by 66 publications

References 8 publications

Fabrication of carbonate apatite block based on internal dissolution-precipitation reaction of dicalcium phosphate and calcium carbonate

Fabrication of carbonate apatite block based on internal dissolution-precipitation reaction of dicalcium phosphate and calcium carbonate

Fabrication of carbonate apatite blocks from set gypsum based on dissolutionprecipitation reaction in phosphate-carbonate mixed solution

Sintering and Osteoclast Behavior of Carbonate Apatite Ceramics

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