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Aizawa, Mamoru; Hanazawa, Takashi; Itatani, Kiyoshi; Howell, F. Scott; Kishioka, Akira

doi:10.1023/a:1004635418655

Cited by 72 publications

(29 citation statements)

References 15 publications

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“…The spectra of the IP6/HAp-100 ( Fig. 3(a)), IP6/HAp-200 (b), and IP6/s-HAp (d), also contained the absorption of CO [2][3] group at ～1550 cm -1 , except for the spectra of the IP6/HAp-400 powder (c). Thus, these results of FT-IR spectra revealed that the starting materials used for cement fabrication were of the pure HAp or carbonate-containing HAp.…”

Section: Mechanical Property Of Apatite Cementsmentioning

confidence: 97%

“…After dispersing about 1 mg of the powder in 200 cm 3 of pure water by applying ultrasound for 3 min, the samples were measured.…”

Section: Characterization Of Powdersmentioning

confidence: 99%

“…1) The HAp ceramics are used in various material shapes, such as blocks, 2) porous ceramics, 3) granules, 4) and cements. 5) Especially, the cements have as advantage for forming ability that the users can prepare the desired shapes, among various material shapes.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of chelate-setting hydroxyapatite cements from four kinds of commercially-available powder with various shape and crystallinity and their mechanical property

Horiguchi

Yoshikawa

Oribe

et al. 2008

J. Ceram. Soc. Japan

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Hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 ; HAp) is one of inorganic components of bone and teeth, and has an osteoconductivity and execellent biocompatibility. Thus, the HAp has been used as biomaterials for bone graftings. Clinically-used HAp cements are set on the basis of the acid-base reaction of Ca 4 O(PO 4 ) 2 and CaHPO 4 . This mechanism accompany the changes of pH during hardening, leading to inflammation around tissues, together with slow setting time. We have succeeded to develop novel HAp cement, which is created by mixing the HAp powder modified with inositol phosphate (IP6) and water. The present IP6-HAp cement is set based on the chelate-bonding of IP6 without the acid-base reaction. The IP6 is not only biocompatible but also has able to chelate to some metal ions as strongly as EDTA. In the present study, we fabricated four kinds of IP6-HAp cements using commercially-available HAp powders with diferent morphology and specific surface area (SSA): HAp-100 (fine particle), HAp-200 (hexagonal shape), HAp-400 (plate shape), and s-HAp (spherical shape). Among the cement specimens examined, the IP6/HAp-100 cement derived from HAp-100 powder had maximum compressive strength of 10 MPa under following condition: Powder/Liquid (P/L) ratio＝1/0.45[w/w]. The HAp-100 powder was composed of microcrystals with the highest SSA of 62.4 m 2 ･g -1 among the HAp powder used in the present work. On the other hand, the compressive strength of the IP6/HAp-200 cements showed the lowest value of 2 MPa under following condition: P/L ratio＝1/0.35[w/w]. The HAp-200 powder of a starting material was composed of hexagonal-shaped crystals, and had the lowest SSA of 7.0 m 2 ･g -1 . These results indicate that the compressive strength of novel IP6/HAp cements was affected by powder properties, especially, the morphology and SSA of starting HAp powders.

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Section: Mechanical Property Of Apatite Cementsmentioning

confidence: 97%

“…After dispersing about 1 mg of the powder in 200 cm 3 of pure water by applying ultrasound for 3 min, the samples were measured.…”

Section: Characterization Of Powdersmentioning

confidence: 99%

See 1 more Smart Citation

Fabrication of chelate-setting hydroxyapatite cements from four kinds of commercially-available powder with various shape and crystallinity and their mechanical property

Horiguchi

Yoshikawa

Oribe

et al. 2008

J. Ceram. Soc. Japan

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show abstract

“…The sample powders were prepared by spray-pytoliyzing the starting solution using the ultrasonic vibrator with frequency of 2.4 MHz in the hot zone. The hot zone in the present USSP apparatus was composed of two electric furnaces: the lower furnace was used for the drying of the droplets (300 °C) and the upper furnace was used for the pyrolysis (850 °C) 14 .…”

Section: ) Preparation Of Kap Powdersmentioning

confidence: 99%

Fabrication of Potassium-Substituted Hydroxyapatite Ceramics via Ultrasonic Spray-Pyrolysis Route

Yokota

Honda

Aizawa

2017

Phosphorus Research Bulletin

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Biological apatite presented in bone and teeth of mammals contains various ions, such as Na + , K + , Mg 2+ , F -and CO32-ions, in trace levels. Substitution of the above ions into hydroxyapatite (HAp) have great effect on the crystallinity, morphology, lattice parameters and stability of the apatite structure. It is known that potassium (K) in the living bone give a tremendous effect to the biomineralization process. Aim of this study is to clarify the influence of substitution of potassium into the HAp structure on the properties of powders and ceramics. In this study, we have fabricated the potassium-substituted hydroxyapatite (KAp) ceramics via an ultrasonic spray-pyrolysis route. Effect of potassium substitution on the phase, chemical composition, morphology and crystal lattice structure of HA was examined. Experimental results showed that the addition of potassium does not significantly affect the crystal phase, particle morphology and particle size. Sintered bodies fabricated from KAp powders were of single phase of HAp, and lattice constants of a-axis and c-axis increased with potassium contents. Substitution of potassium into the HAp lattice formed OH vacancies and caused grain growth.

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“…2.5 cm and height 1m; electric furnace: I.D. 3cm and height 60cm) and a powder collecting zone (test-tube type filter), as reported previously.18), 19) The hot zone in this apparatus had two electric furnaces; the lower furnace was used for the drying of droplets and the upper furnace for the spray pyrolysis.…”

mentioning

confidence: 99%

Characterization of Strontiumapatite Powders Prepared by Ultrasonic Spray-Pyrolysis Technique.

Aizawa

Howell

Itatani

1999

J. Ceram. Soc. Japan

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Untitled

Cited by 72 publications

References 15 publications

Fabrication of chelate-setting hydroxyapatite cements from four kinds of commercially-available powder with various shape and crystallinity and their mechanical property

Fabrication of chelate-setting hydroxyapatite cements from four kinds of commercially-available powder with various shape and crystallinity and their mechanical property

Fabrication of Potassium-Substituted Hydroxyapatite Ceramics via Ultrasonic Spray-Pyrolysis Route

Characterization of Strontiumapatite Powders Prepared by Ultrasonic Spray-Pyrolysis Technique.

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