The Laser-Raman Spectroscopic Studies on Human Enamel and Precipitated Carbonate-containing Apatites

Nishino, Mizuho; Yamashita, Shinsuke; Aoba, Takaaki; Okazaki, Masanori; Moriwaki, Yuji

doi:10.1177/00220345810600031601

Cited by 45 publications

(22 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1, table I). The v2 and v4(P 04) regions, in particular, were very similar to the v2 and v4(P 04) regions in the spectra of syn thetic carbonated apatites and powdered human dental enamel [O'Shea et al, 1974;Nishino et al, 1981;Nelson and William son, 1982], The V| and V 3(P0 4) regions of OCP were, however, more distinctive. In the V|(P04) region a strong doublet ap peared, centered near 960 cm-1, which was not seen in apatite spectra.…”

Section: Octacalcium Phosphatementioning

confidence: 79%

“…Laser Raman spectroscopy, especially in conjunction with infrared (IR) spec troscopy, has proved to be a powerful and sensitive tool to study the structural details of ionic moieties such as POif, CO^', and OH-in the apatite crystal structure [O'Shea et al, 1974;Nishino et al, 1981;Nelson and Featherstone, 1982;Nelson and Williamson, 1982], Although Raman spec troscopy provides information about the vibrational energy levels of a material, a Raman spectrum and an IR spectrum of the same material differ because of the dif ferent selection rules involved. Thus vibra tional modes which are not IR active may be Raman active and vice versa.…”

mentioning

confidence: 99%

See 1 more Smart Citation

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

Nelson

Williamson

1985

Caries Res

View full text Add to dashboard Cite

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.

show abstract

Section: Octacalcium Phosphatementioning

confidence: 79%

mentioning

confidence: 99%

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

Nelson

Williamson

1985

Caries Res

View full text Add to dashboard Cite

show abstract

“…[25][26][27]41,[53][54][55][56] The samples were compared using PCA to find the natural variance between spectra and PLS to correlate the physical properties (such as hardness and elastic modulus) with the chemical information (Raman spectra).…”

Section: Raman Spectroscopymentioning

confidence: 99%

Chemical and mechanical properties of snake fangs

Vuuren

Dickenson

Gordon

et al. 2016

J Raman Spectroscopy

View full text Add to dashboard Cite

The composition of dental tissues and their interaction determines its mechanical properties. The mechanical properties and chemical composition of the teeth of extant reptiles are still poorly studied areas. As a preliminary study the fangs of four species of snakes and a human tooth were investigated through nanoindentation and Raman spectroscopy. The average elastic modulus values for the main body of the fangs ranged from 15.3 GPa to 24.6 GPa, and 19.1 GPa for the human dentine. Raman spectroscopy and principal component analysis (PCA) showed that snake fangs are similar in composition to human dentine, both of which comprised of hydroxyapatite and an organic matrix. The elastic modulus and hardness data were correlated to the Raman spectra using partial least squares regression (PLS). The spectral features which correlated with the elastic modulus would suggest that elastic modulus is dependent on the relative protein to mineral amounts in the tooth. The form of the phosphate and the relative levels of phosphate to organic components also appear to be governing factors for elastic modulus. The PLS of Raman spectra against the hardness gave very similar results. The small differences between snake fangs and human dentine appeared to be because of carbonate content, with higher levels of carbonate in the human tooth than the snake fangs.Snake fangs should be able to withstand large lateral forces. Human dentine aids in dissipating imposed loads. This similarity in the chemical composition of the snake fangs and human dentine supported the findings of the similarities in mechanical properties, which may be attributed to the similar functional demands of these biocomposites.

show abstract

“…powder, 9 artificial apatite, synthetic carbonated apatite 10,11 and synthetic fluorohydroxyapatite. 12 The relative orientation of single crystal in human dental enamel, and the deposition of CaF 2 -like crystals after fluoride treatment have been investigated.…”

Section: Introductionmentioning

confidence: 99%