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Statements

Subject Item
n2:RIV%2F61388980%3A_____%2F12%3A00376288%21RIV13-AV0-61388980
rdf:type
skos:Concept n12:Vysledek
dcterms:description
Thermal study and structural characterization of biological hydroxyapatite (HA) samples were done as well as their comparison with commercial and synthetic samples in this study. The X-ray micro analyser shows that all three samples of human teeth (HT1-HT3) contain two types of HA structures with different crystallite sizes, unlike sample of bovine thigh-bone (BTB). The bone sample was composed only of one HA phase with varied porosity. The molar Ca/P ratio in biological samples was lower compared to theoretical ratio for pure HA; moreover, in the case of teeth, Ca/P ratio varyies between the centre and the periphery of the cross-sectional samples. Thermogravimetry of the biological samples showed mass decreases-three regions for the bone and four regions for the teeth. In comparison, commercial HA has only two-step weight loss and synthetic HA three-step weight loss. After the calcination up to 1280 degrees C all the samples of teeth transformed into whitlockite, beta-(Ca,Mg)(3)(PO4)(2) (98 wt%) and 2 wt% HA. Besides, HT3 contained further trace amount of hilgenstockite (HIL, Ca4P2O9). The sample BTB partly transited from natural HA into HIL (6 wt%) and lime, CaO (14 wt%). X-ray powder diffraction (XRD) proved occurrence of HIL (9 wt%) beside stability part HA (91 wt%) in the commercial HA after thermal treatment but the synthetic HA composed from Ca-3(PO4)(2) (74 wt%) and HA (26 wt%). Thermal study and structural characterization of biological hydroxyapatite (HA) samples were done as well as their comparison with commercial and synthetic samples in this study. The X-ray micro analyser shows that all three samples of human teeth (HT1-HT3) contain two types of HA structures with different crystallite sizes, unlike sample of bovine thigh-bone (BTB). The bone sample was composed only of one HA phase with varied porosity. The molar Ca/P ratio in biological samples was lower compared to theoretical ratio for pure HA; moreover, in the case of teeth, Ca/P ratio varyies between the centre and the periphery of the cross-sectional samples. Thermogravimetry of the biological samples showed mass decreases-three regions for the bone and four regions for the teeth. In comparison, commercial HA has only two-step weight loss and synthetic HA three-step weight loss. After the calcination up to 1280 degrees C all the samples of teeth transformed into whitlockite, beta-(Ca,Mg)(3)(PO4)(2) (98 wt%) and 2 wt% HA. Besides, HT3 contained further trace amount of hilgenstockite (HIL, Ca4P2O9). The sample BTB partly transited from natural HA into HIL (6 wt%) and lime, CaO (14 wt%). X-ray powder diffraction (XRD) proved occurrence of HIL (9 wt%) beside stability part HA (91 wt%) in the commercial HA after thermal treatment but the synthetic HA composed from Ca-3(PO4)(2) (74 wt%) and HA (26 wt%).
dcterms:title
Structural characterization and thermal behaviour of biological hydroxyapatite Structural characterization and thermal behaviour of biological hydroxyapatite
skos:prefLabel
Structural characterization and thermal behaviour of biological hydroxyapatite Structural characterization and thermal behaviour of biological hydroxyapatite
skos:notation
RIV/61388980:_____/12:00376288!RIV13-AV0-61388980
n12:predkladatel
n15:ico%3A61388980
n3:aktivita
n8:S n8:Z
n3:aktivity
S, Z(AV0Z40320502), Z(MSM0021627501)
n3:cisloPeriodika
1
n3:dodaniDat
n6:2013
n3:domaciTvurceVysledku
n14:4549287 n14:7933665
n3:druhVysledku
n19:J
n3:duvernostUdaju
n18:S
n3:entitaPredkladatele
n5:predkladatel
n3:idSjednocenehoVysledku
171811
n3:idVysledku
RIV/61388980:_____/12:00376288
n3:jazykVysledku
n10:eng
n3:klicovaSlova
hydroxyapatite; hard tissues; X-ray powder diffraction; scanning electron microscope; thermal analysis; mass spectrometry
n3:klicoveSlovo
n11:thermal%20analysis n11:scanning%20electron%20microscope n11:X-ray%20powder%20diffraction n11:mass%20spectrometry n11:hard%20tissues n11:hydroxyapatite
n3:kodStatuVydavatele
HU - Maďarsko
n3:kontrolniKodProRIV
[06F74DEC28D0]
n3:nazevZdroje
Journal of Thermal Analysis and Calorimetry
n3:obor
n16:CA
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
5
n3:rokUplatneniVysledku
n6:2012
n3:svazekPeriodika
108
n3:tvurceVysledku
Bezdička, Petr Maříková, Monika Svoboda, L. Honcová, P. Kohutová, A.
n3:wos
000302704500022
n3:zamer
n13:MSM0021627501 n13:AV0Z40320502
s:issn
1388-6150
s:numberOfPages
8
n17:doi
10.1007/s10973-011-1942-6