title: Effect of temperature on crystallinity of carbonate apatite foam prepared from alpha-tricalcium phosphate by hydrothermal treatment.
abstract: The effect of temperature on crystallinity of carbonate apatite (CAp) foam prepared from alpha-tricalcium phosphate (alpha-TCP) foam by hydrothermal treatment was investigated in the present study. The alpha-TCP foams were prepared through a conventional sintering method using polyurethane foam as template. Then, the resultant alpha-TCP foams were hydrothermally treated with Na2CO3 aqueous solution at 100 degrees C, 150 degrees C and 200 degrees C for 72 h. After hydrothermal treatment, the cancellous bone-like macroporous structure of the alpha-TCP foams was maintained. However, microscopic morphology of the foams' frame significantly changed after the 72 h treatment period. The smooth surface of alpha-TCP foam disappeared and the whole surface was covered with plate-like deposits. The plate-like deposits treated at 150 degrees C and 200 degrees C had smooth surface while those treated at 100 degrees C were constructed from spherical particles of approximately 200 nm in diameter. The results of X-ray diffraction and Fourier transform infrared analysis showed that alpha-TCP was completely converted to CAp and the crystallinity of CAp prepared at 100 degrees C was significantly lower than those prepared at 150 degrees C and 200 degrees C. Hydrothermal treatment of alpha-TCP foam at 100 degrees C allowed the formation of low-crystalline CAp foam but complete conversion needs a longer treatment period.
authors: Department of Biomaterials, Faculty of Dental Science, Kyushu University, Fukuoka, Japan. takeuchi@dent.kyushu-u.ac.jp
authors: Akari
authors: A
authors: Takeuchi
authors: Melvin L
authors: ML
authors: Munar
authors: Hanae
authors: H
authors: Wakae
authors: Michito
authors: M
authors: Maruta
authors: Shigeki
authors: S
authors: Matsuya
authors: Kanji
authors: K
authors: Tsuru
authors: Kunio
authors: K
authors: Ishikawa
mesh_terms: D000042:Absorption; D001031:Apatites / Q000737:chemistry*; D018786:Bone Substitutes / Q000737:chemistry*; D002130:Calcium Phosphates / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D005740:Gases / Q000737:chemistry; D008422:Materials Testing; D010316:Particle Size; D016062:Porosity; D013499:Surface Properties; D013696:Temperature
chemical_list: D001031:Apatites; D018786:Bone Substitutes; D002130:Calcium Phosphates; D005740:Gases; C485828:alpha-tricalcium phosphate; C030782:carboapatite