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Papers by Gérard Dechambre

Research paper thumbnail of New Calcium Carbonate-Based Cements for Bone Reconstruction

Key Engineering Materials, 2005

The feasibility of calcium carbonate-based cements involving the re-crystallization of metastable... more The feasibility of calcium carbonate-based cements involving the re-crystallization of metastable calcium carbonate varieties has been demonstrated. Two cement compositions were obtained by mixing either calcium carbonate phases (cement A) or a calcium carbonate and a calcium phosphate phase (cement B) with an aqueous media. These cements set and hardened after 30 minutes and 90 minutes respectively. The final composition of cement A was calcite and aragonite whereas cement B lead to a carbonated apatite analogous to bone mineral. Despite poor mechanical properties the presence of a high carbonate content in the final phase might be of interest to increase the cement resorption rate and to favour its replacement by bone tissue. First assays of implantation performed on fresh anatomical pieces (fresh cadavers) at 37°C revealed important advantages of such cement compositions: easiness of use, rapid setting, good adhesion to bone, very good homogeneity and stability of the cement.

Research paper thumbnail of Impact of Calcium Phosphate Particle Morphology on Osteoconduction: an In Vivo Study

OATAO is an open access repository that collects the work of Toulouse researchers and makes it fr... more OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID : 2311

Research paper thumbnail of Nanocrystalline apatites: From powders to biomaterials

Powder Technology, 2009

OATAO is an open access repository that collects the work of Toulouse researchers and makes it fr... more OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID : 2822

Research paper thumbnail of High purity multiwalled carbon nanotubes under high pressure and high temperature

Carbon, 2003

We have studied the structural modifications that multi-walled carbon nanotubes (MWNTs) undergo w... more We have studied the structural modifications that multi-walled carbon nanotubes (MWNTs) undergo when treated under high pressure and high temperature (HP–HT). Uniaxial pressures of 5.5–6.5 GPa were applied to samples of purified MWNTs between 850 and 950°C for 30 min. The resulting material was then analysed by X-ray diffractometry, Raman spectroscopy and transmission electron microscopy. Comparison of the data obtained

Research paper thumbnail of Bioceramics: Spark Plasma Sintering (SPS) of Calcium Phosphates

Advances in Science and Technology, 2006

OATAO is an open access repository that collects the work of Toulouse researchers and makes it fr... more OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID : 2537

Research paper thumbnail of Production, by co-grinding in a media mill, of porous biodegradable polylactic acid–apatite composite materials for bone tissue engineering

Powder Technology, 2009

This paper presents the results of a study of the production of porous biodegradable composite ma... more This paper presents the results of a study of the production of porous biodegradable composite materials by co-grinding, followed by scaffolding. Dry powders of polylactic acid and nanocrystalline carbonated apatite, analogous to bone mineral were co-ground in a tumbling ball mill in order to disperse the mineral filler within the polymer. Porous scaffolds were then made by hot moulding the

Research paper thumbnail of New Calcium Carbonate-Based Cements for Bone Reconstruction

Key Engineering Materials, 2005

The feasibility of calcium carbonate-based cements involving the re-crystallization of metastable... more The feasibility of calcium carbonate-based cements involving the re-crystallization of metastable calcium carbonate varieties has been demonstrated. Two cement compositions were obtained by mixing either calcium carbonate phases (cement A) or a calcium carbonate and a calcium phosphate phase (cement B) with an aqueous media. These cements set and hardened after 30 minutes and 90 minutes respectively. The final composition of cement A was calcite and aragonite whereas cement B lead to a carbonated apatite analogous to bone mineral. Despite poor mechanical properties the presence of a high carbonate content in the final phase might be of interest to increase the cement resorption rate and to favour its replacement by bone tissue. First assays of implantation performed on fresh anatomical pieces (fresh cadavers) at 37°C revealed important advantages of such cement compositions: easiness of use, rapid setting, good adhesion to bone, very good homogeneity and stability of the cement.

Research paper thumbnail of Impact of Calcium Phosphate Particle Morphology on Osteoconduction: an In Vivo Study

OATAO is an open access repository that collects the work of Toulouse researchers and makes it fr... more OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID : 2311

Research paper thumbnail of Nanocrystalline apatites: From powders to biomaterials

Powder Technology, 2009

OATAO is an open access repository that collects the work of Toulouse researchers and makes it fr... more OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID : 2822

Research paper thumbnail of High purity multiwalled carbon nanotubes under high pressure and high temperature

Carbon, 2003

We have studied the structural modifications that multi-walled carbon nanotubes (MWNTs) undergo w... more We have studied the structural modifications that multi-walled carbon nanotubes (MWNTs) undergo when treated under high pressure and high temperature (HP–HT). Uniaxial pressures of 5.5–6.5 GPa were applied to samples of purified MWNTs between 850 and 950°C for 30 min. The resulting material was then analysed by X-ray diffractometry, Raman spectroscopy and transmission electron microscopy. Comparison of the data obtained

Research paper thumbnail of Bioceramics: Spark Plasma Sintering (SPS) of Calcium Phosphates

Advances in Science and Technology, 2006

OATAO is an open access repository that collects the work of Toulouse researchers and makes it fr... more OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID : 2537

Research paper thumbnail of Production, by co-grinding in a media mill, of porous biodegradable polylactic acid–apatite composite materials for bone tissue engineering

Powder Technology, 2009

This paper presents the results of a study of the production of porous biodegradable composite ma... more This paper presents the results of a study of the production of porous biodegradable composite materials by co-grinding, followed by scaffolding. Dry powders of polylactic acid and nanocrystalline carbonated apatite, analogous to bone mineral were co-ground in a tumbling ball mill in order to disperse the mineral filler within the polymer. Porous scaffolds were then made by hot moulding the

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