Two types of carbonate substitution in the apatite structure

LeGeros, Racquel Z.; Trautz, Otto R.; Klein, Edward B.; LeGeros, John P.

doi:10.1007/bf01903856

Cited by 357 publications

(394 citation statements)

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“…Spectra also showed a shoulder at 1080 to 1090 cm -1 which corresponds to a P-O stretch which is also observed in Btype substituted HCA [20]. At 1 week, it is most clearly pronounced in glasses A and high fluorine-content glasses (Fig.…”

Section: Apatite Deposition In Sbfmentioning

confidence: 63%

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Fluoride-containing bioactive glasses: Effect of glass design and structure on degradation, pH and apatite formation in simulated body fluid

Brauer

Karpukhina

O’Donnell³

et al. 2010

Acta Biomaterialia

284

233

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Effect of fluoride content of bioactive glasses on apatite deposition in simulated body fluid 2/15Summary Bioactive glasses are able to bond to bone through formation of carbonated hydroxyapatite in body fluids, and fluoridereleasing bioactive glasses are of interest for both orthopaedic and in particular dental applications for caries inhibition.Melt-derived glasses in the system SiO 2 -P 2 O 5 -CaO-Na 2 O with increasing amounts of CaF 2 were prepared by keeping network connectivity and the ratio of all other components constant.pH change, ion release and apatite formation during immersion of glass powder in simulated body fluid at 37°C over up to two weeks were investigated. Crystal phases formed in SBF were characterised using infra-red spectroscopy, X-ray diffraction with Rietveld analysis and solid-state nuclear magnetic resonance spectroscopy ( 19 F and 31 P MAS-NMR).Results show that incorporation of fluoride resulted in a reduced pH rise in aqueous solutions compared to fluoride-free glasses and in formation of fluorapatite (FAp), which is more chemically stable than hydroxyapatite or carbonated hydroxyapatite and therefore is of interest for dental applications. However, for increasing fluoride content in the glass, fluorite (CaF 2 ) was formed at the expense of FAp. Apatite formation could be favoured by increasing the phosphate content in the glass, as the release of additional phosphate into the SBF would affect supersaturation in the solution and

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Section: Apatite Deposition In Sbfmentioning

confidence: 63%

“…3a for usually taken as indication of presence of precursors to hydroxyapatite (HAp) [19]. Apatitic PO 4 3-groups give characteristic split bands at 560 and 600 cm -1 [20], with a third signal at 575 cm -1 [21] observed for crystallites of small size. At one week (Fig.…”

Section: Apatite Deposition In Sbfmentioning

confidence: 99%

Fluoride-containing bioactive glasses: Effect of glass design and structure on degradation, pH and apatite formation in simulated body fluid

Brauer

Karpukhina

O’Donnell³

et al. 2010

Acta Biomaterialia

284

233

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“…Using infrared spectroscopy and X-ray diffraction, increases in HPO 4 2-content have been determined to produce an expansion of the hydroxyapatite a axis at a rate of ∼0.0015=Å/ wt% [33]. The presence of HPO 4 2-may also induce crystal disorder, as has been shown to happen even in well-crystallized hydroxyapatites when carbonate substitutes for phosphate [34]. Changes in the relative amount of carbonate in the mineral (carbonate:mineral) or the type of carbonate substitution during dentin maturation, in the present results, were not significant.…”

Section: Discussionmentioning

confidence: 99%

Maturational changes in dentin mineral properties

Verdelis

Lukashova

Wright

et al. 2007

Bone

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In this study the changes in properties of the maturing mantle and circumpulpal dentin were quantitatively analyzed. Sections from six fetal bovine undecalcified incisors were used. Regions of mantle and circumpulpal dentin of sequential maturation stages were identified on spectroscopic images acquired by Fourier Transform Infrared Imaging. Spectroscopic parameters corresponding to mineral properties at these stages were analyzed and reported as a function of distance from the cervix of the incisor, the latter representing tissue age. Mineral parameters were correlated with distance from the cervix. Values of these parameters in mantle and circumpulpal dentin were compared. A multi-phasic pattern of changes was found for all the parameters examined, with most of the alterations occurring in the initial maturation period. The patterns of temporal variation in mantle and circumpulpal dentin mineral properties show distinct developmental stages and were not identical for the two dentin compartments. The study showed that mineral maturation in dentin is not a linear process and that mantle dentin is developmentally distinct from circumpulpal dentin, presenting at certain stages different physicochemical events during the maturation of the tissue.

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“…There fore members of min eral ap a tite-group are re mark ably di verse in their ma jor and trace el e ment com po si tions be cause nu mer ous substi tu tions that can oc cur with out sub stan tial chang ing of the basic lat tice struc ture (e.g., Pan and Fleet, 2002). Biogenic apatites gen er ally have a cal cium hydroxyl-fluorapatite frame work with com mon sub sti tu tions of Sr 2+ re plac ing Ca 2+ and CO 3 2 -occu py ing PO 4 3 -and OH -po si tions (LeGeros et al, 1969;Eanes, 1979;SÝnju Clasen and Ruyter, 1997). Nat u ral po ros ity of bioapatite, that pro vides the pore space for diaganetic flu ids, de creases from ~40 to ~1% from bone to dentine to enamel.…”

Section: Human Enamel As the Potential Source Of Information About Pamentioning

confidence: 99%

Reconstructing seasonality using d18O in incremental layers of human enamel: a test of the analytical protocol developed for SHRIMP IIe/MC ion microprobe

Krzemińska

Sołtysiak

Czupyt

2017

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Re con struct ing sea son al ity us ing d 18 O in in cre men tal lay ers of hu man enamel: a test of the an a lyt i cal pro to col de vel oped for SHRIMP IIe/MC ion microprobe Ewa A num ber of re cent stud ies deal ing with palaeoclimate and en vi ron men tal re con struc tion in clude the mea sure ment of ox ygen iso tope com po si tion of mam ma lian teeth. Some of them ana lyse a tem po ral se quence of the changes re corded in bioapatite from enamel lay ers rep re sent ing the whole pe riod of tooth de vel op ment. Enamel sam ples dis play large intra-tooth d 18 O vari a tions that may re flect a sea sonal fluc tu a tion in the d 18 O of lo cal palaeoclimate pa ram e ters. The pres ent pa per provides an ef fec tive an a lyt i cal pro to col for se quen tial d 18 O anal y sis of hu man teeth us ing SHRIMP IIe/MC ion microprobe. It is pos si ble to fol low the in ner enamel layer along enamel-dentine junc tion on a high spa tial scale in a range about 0.02 mm of spot di am e ter and 0.12-0.14 mm of the dis tance be tween spots. Us ing the meth od ol ogy de scribed herein, we can achieve an ex ter nal pre ci sion for d 18 O anal y sis <0.2‰ (1s). The num ber of 60 to 90 sin gle anal y ses cov er ing the enamel layer between the incisal and api cal ends is enough to ob tain tem po ral res o lu tion of less than one month and to doc u ment pre cisely sea sonal fluc tu a tion caused by lo cal en vi ron men tal and cli mate fac tors. The meth od ol ogy of d 18 O in situ mea sure ments has been tested on hu man teeth from Tell Majnuna, a 4th mil len nium BCE cem e tery in North ern Mes o po ta mia, which is a rel atively arid area with high sea sonal dif fer ences in pre cip i ta tion and tem per a ture. Ob served pat tern of d 18 O vari a tions is consis tent with ex pected sea sonal fluc tu a tions, al though the over all ef fect is blurred by some in er tia in the enamel mat u ra tion.Key words: palaeoclimate, bioapatite, hu man teeth, se quen tial microsampling, Mid dle East, Mes o po ta mia. INTRODUCTIONOx y gen iso tope anal y sis of den tal enamel is a pow er ful tool for palaeo bio logi cal and ar chae o log i cal stud ies as an in di ca tor of the pa ram e ters of phys i ol ogy, nat u ral en vi ron ment and hab itat pref er ences. A par tic u larly prom is ing ap proach is to measure intra-tooth vari a tion (Ballase, 2003;Blaise and Balasse, 2011;Stevens et al., 2011), be cause teeth ac cu mu late a sequence of sig nif i cant iso to pic in for ma tion cov er ing the short time of enamel bioapatite pro gres sive for ma tion.The ox y gen iso tope in ves ti ga tions of mam ma lian den tal enamel are based on a few gen eral as sump tions that:-the tis sues of or gan ism iso to pi cally equil i brated with their en vi ron ment will re flect the lo cal en vi ron men tal oxy gen ra tio; -iso to pic sig na ture of skel e tal tis sues is di rectly re lated to that of the lo cal drink ing wa ter; -bioapatite, the main com po nent of teeth, is rel a tively most re sis tant to diagenetic pro cesses and pre serves it...

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Two types of carbonate substitution in the apatite structure

Cited by 357 publications

References 0 publications

Fluoride-containing bioactive glasses: Effect of glass design and structure on degradation, pH and apatite formation in simulated body fluid

Fluoride-containing bioactive glasses: Effect of glass design and structure on degradation, pH and apatite formation in simulated body fluid

Maturational changes in dentin mineral properties

Reconstructing seasonality using d18O in incremental layers of human enamel: a test of the analytical protocol developed for SHRIMP IIe/MC ion microprobe

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