Raman Spectra of Phosphate and Monofluorophosphate Ions in Several Dentally-Relevant Materials

Abstract

Raman spectra of octacalcium phosphate, sodium monofluorophosphate and aqueous monofluorophosphate solutions were obtained, some at temperatures as low as 40°K. The internal modes of phosphate and monofluorophosphate (PO₃F²^––) moieties in these materials were compared with each other and with previously reported spectra of carbonated apatites and dental enamel. Octacalcium phosphate could be identified from apatite by differences in the phosphate bands of their Raman spectra. Monofluorophosphate ions, either located in a crystal structure or in aqueous solution, could be easily distinguished from phosphate ions using Raman spectroscopy.

Ab Initio Study of Bonding Trends among Cyanamidophosphates ([POn(NCN)4−n]3−) and Related Systems

“…[21,29,30] The comparison with the gas-phase spectra of FClO 3 is also very satisfactory. The agreement with the experimental assignment of Kirillov et al [26] for monofluorophosphate is also acceptable, while that with Nelson and Williamson [28] is less clear.…”

Diagnostic Imaging and Spectroscopy

“…Raman spectra have been obtained of hydroxyapatite, enamel, dentin, and calculus [137][138][139][140][141]. Highresolution micro-Raman spectroscopy has been used to analyze the chemical composition of the internal interfaces between enamel/dentin and cementum [142].…”

Determinação de parâmetros seguros e efetivos do laser de CO2 (?= 10,6 ?m) na redução da desmineralização da dentina radicular - Estudo in vitro

“…Nos resultados da espectroscopia FT-Raman, as bandas mais fortes dos modos vibracionais de fosfato ν1 e de carbonato v1, que foram previamente reportadas (CARTER;EDWARDS, 2001;FATTIBENE et al, 2005;NAUMANN, 2001;WILLIAMSON, 1985;TSUDA;RUBEN;ARENDS, 1996) foram prontamente identificadas. De forma semelhante, a fase orgânica também foi observada no espectro da dentina radicular, com bandas dentro da faixa de 1100-1700 cm −1 do espectro (TRAMINI et al, 2000).…”

“…O espectro Raman de qualquer estrutura mineral, e especialmente de dentes humanos, pode revelar a composição química e estrutural dos componentes orgânicos e minerais. Dessa forma, as bandas geralmente encontradas nos espectros de esmalte e dentina humana são as bandas mais fortes dos modos vibracionais de fosfato ν1 e de carbonato v1, em uma região que se estende de 300 a 1.100 cm -1 (CARTER; EDWARDS, 2001;FATTIBENE et al, 2005;NAUMANN, 2001;WILLIAMSON, 1985;TSUDA;RUBEN;ARENDS, 1996); uma outra região, representativa da fase de colágeno, mostra os modos vibracionais dos grupos orgânicos (amida e CH) na região de 1.200-3.000 cm -1 (TRAMINI et al, 2000). A banda na escala de 1026-1072 cm -1 pode também representar a vibração do carbonato v1 (carbonato tipo B).…”