Dielectric properties and structure of hydroxyapatite ceramics sintered by different conditions

Valdés, José E.; Rodriguez, A. Victorero; Carrió, J. G.

doi:10.1557/jmr.1995.2174

Cited by 33 publications

(9 citation statements)

References 4 publications

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“…Most of them include the use of calcium chloride (CaCl 2 ) salt and potassium dihydrogen phosphate (KH 2 PO 4 ) to produce the precipitation of a white powder which, after drying, is sintered at 900 • C [17]. In this work we followed the Tsilieus method which employs the reaction of calcium hydroxide (Ca(OH) 2 ) suspension and phosphoric acid solution (H 3 PO 4 ) [18,19]. HAP samples with Ca/P ratios of 1.57 (a sample with 6% less Ca), 1.67 and 1.77 (a sample with 6% more Ca) were obtained by phosphoric acid (H 3 PO 4 ) at 0.3 M and three solutions of calcium hydroxide at 0.47 M, 0.5 M and 0.53 M, respectively.…”

Section: Methodsmentioning

confidence: 99%

Structural and thermal behaviour of human tooth and three synthetic hydroxyapatites from 20 to 600 °C

Reyes‐Gasga¹,

Garcı́a-Garcı́a²,

Arellano-Jimenez³

et al. 2008

J. Phys. D: Appl. Phys.

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The structural and thermal properties of human tooth enamel, dentine and three synthetic hydroxyapatite samples with Ca/P ratios of 1.57 (Ca deficiency), 1.67 and 1.77 (Ca excess), respectively, were analysed in the temperature range from 20 to 600 °C to have information on the parameters involved in the ionic/electrical conductivities reported for human tooth enamel between 200 and 350 °C approximately. Studies were carried out through x-ray diffraction, thermo-gravimetric analysis, differential scanning calorimetry, Fourier transform infrared spectroscopy and temperature programmed desorption. Chemical analysis was performed by x-ray characteristic energy dispersive spectroscopy. Results indicate a strong correlation between the removal of the OH− groups from the hydroxyapatite unit cell and the expulsion of absorbed water and lattice water registered during heating.

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Section: Methodsmentioning

confidence: 99%

Structural and thermal behaviour of human tooth and three synthetic hydroxyapatites from 20 to 600 °C

Reyes‐Gasga¹,

Garcı́a-Garcı́a²,

Arellano-Jimenez³

et al. 2008

J. Phys. D: Appl. Phys.

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“…Electrical measurements have also been used as a characterization tool to study the evolution of microstructure in HA bioceramics [375]. More to the point, Valdes et al examined the dielectric properties of HA to understand its decomposition to β-TCP [376]. In the case of CDHA, the electrical properties, in terms of ionic conductivity, were found to increase after compression of the samples at 15 t/cm 2 , which was attributed to establishment of some order within the apatitic network [377].…”

Section: The Major Propertiesmentioning

confidence: 99%

Calcium Orthophosphate-Based Bioceramics

Dorozhkin¹

2013

Materials

228

153

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Various types of grafts have been traditionally used to restore damaged bones. In the late 1960s, a strong interest was raised in studying ceramics as potential bone grafts due to their biomechanical properties. A bit later, such synthetic biomaterials were called bioceramics. In principle, bioceramics can be prepared from diverse materials but this review is limited to calcium orthophosphate-based formulations only, which possess the specific advantages due to the chemical similarity to mammalian bones and teeth. During the past 40 years, there have been a number of important achievements in this field. Namely, after the initial development of bioceramics that was just tolerated in the physiological environment, an emphasis was shifted towards the formulations able to form direct chemical bonds with the adjacent bones. Afterwards, by the structural and compositional controls, it became possible to choose whether the calcium orthophosphate-based implants remain biologically stable once incorporated into the skeletal structure or whether they were resorbed over time. At the turn of the millennium, a new concept of regenerative bioceramics was developed and such formulations became an integrated part of the tissue engineering approach. Now calcium orthophosphate scaffolds are designed to induce bone formation and vascularization. These scaffolds are often porous and harbor different biomolecules and/or cells. Therefore, current biomedical applications of calcium orthophosphate bioceramics include bone augmentations, artificial bone grafts, maxillofacial reconstruction, spinal fusion, periodontal disease repairs and bone fillers after tumor surgery. Perspective future applications comprise drug delivery and tissue engineering purposes because calcium orthophosphates appear to be promising carriers of growth factors, bioactive peptides and various types of cells.

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“…Electrical measurements have also been used as a characterization tool to study the evolution of microstructure in HA bioceramics [305]. More to the point, Valdes et al examined the dielectric properties of HA to understand its decomposition to β-TCP [306]. In the case of CDHA, the electrical properties, in terms of ionic conductivity, were found to increase after compression of the samples at 15 t/cm 2 , which was attributed to establishment of some order within the apatitic network [307].…”

Section: The Major Propertiesmentioning

confidence: 99%

Calcium Orthophosphates as Bioceramics: State of the Art

Dorozhkin¹

2010

JFB

214

112

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In the late 1960s, much interest was raised in regard to biomedical applications of various ceramic materials. A little bit later, such materials were named bioceramics. This review is limited to bioceramics prepared from calcium orthophosphates only, which belong to the categories of bioactive and bioresorbable compounds. There have been a number of important advances in this field during the past 30–40 years. Namely, by structural and compositional control, it became possible to choose whether calcium orthophosphate bioceramics were biologically stable once incorporated within the skeletal structure or whether they were resorbed over time. At the turn of the millennium, a new concept of calcium orthophosphate bioceramics—which is able to promote regeneration of bones—was developed. Presently, calcium orthophosphate bioceramics are available in the form of particulates, blocks, cements, coatings, customized designs for specific applications and as injectable composites in a polymer carrier. Current biomedical applications include artificial replacements for hips, knees, teeth, tendons and ligaments, as well as repair for periodontal disease, maxillofacial reconstruction, augmentation and stabilization of the jawbone, spinal fusion and bone fillers after tumor surgery. Exploratory studies demonstrate potential applications of calcium orthophosphate bioceramics as scaffolds, drug delivery systems, as well as carriers of growth factors, bioactive peptides and/or various types of cells for tissue engineering purposes.

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Dielectric properties and structure of hydroxyapatite ceramics sintered by different conditions

Cited by 33 publications

References 4 publications

Structural and thermal behaviour of human tooth and three synthetic hydroxyapatites from 20 to 600 °C

Structural and thermal behaviour of human tooth and three synthetic hydroxyapatites from 20 to 600 °C

Calcium Orthophosphate-Based Bioceramics

Calcium Orthophosphates as Bioceramics: State of the Art

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