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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2025-08-20 22:54 |
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Conference: Bucharest University Faculty of Physics 2025 Meeting
Section: Atomic and Molecular Physics. Astrophysics. Applications. Optics, Spectroscopy, Plasma and Lasers
Title:
The Study of Calcium Phosphates for Confocal Raman Microscopy of Tooth
Authors:
Georgiana IVAN (1), Dr. Catalin LUCULESCU (2)
Affiliation:
1)University of Bucharest, Faculty of Physics
2)National Institute for Lasers, Plasma and Radiation Physics, CETAL
E-mail
ivangeorgiana76@gmail.com
Keywords:
raman, phosphates, tooth, microscopy
Abstract:
Several calcium phosphates were studied by Raman micro-spectroscopy at 532 and 785 nm in order to identify the chemical compounds in tooth sections with a spatial resolution of a few micrometers. The materials employed in this study are: β-tri-Calcium phosphate (β-TCP), Octacalcium phosphate (OCP), amorphous and several types of crystalline hydroxyapatite (HAp). All materials were of analytical grade and were pressed to a 12 mm diameter pellet form before Raman backscattering measurements. The identified Raman active modes are grouped mainly in 4 regions, 390-480 cm-1, 540-640 cm-1, 940-980 cm-1 and 1005-1095 cm-1, that correspond to main P-O bending and stretching vibrations.
The axial plan slices of an extracted tooth were investigated by Raman microspectroscopy under similar conditions. The differences are related to organic parts of the tooth that are luminescent. It is possible to identify several mineral components, mainly the ν1 mode of P-O.
Our study shows that Raman spectroscopy can be improved and turned into an emergent 2D investigation tool.
References:
1. Ather Farooq Khan , Muhammad Awais , Abdul Samad Khan , Sobia Tabassum , Aqif Anwar Chaudhry & Ihtesham Ur Rehman (2013) Raman Spectroscopy of Natural Bone and Synthetic Apatites
2.De Aza, P. N., Guitián, F., Santos, C., de Aza, S., Cuscó, R., & Artús, L. (1997). Vibrational Properties of Calcium Phosphate Compounds. 2. Comparison between Hydroxyapatite and β-Tricalcium Phosphate
3.Carrodeguas, R. G., & De Aza, S. (2011). α-Tricalcium phosphate: Synthesis, properties and biomedical applications.
4. Fowler, B. O., Markovic, M., & Brown, W. E. (1993). Octacalcium phosphate. 3. Infrared and Raman vibrational spectra
5. Timchenko, P. E., Timchenko, E. V., Pisareva, E. V., Vlasov, M. Y., Red’kin, N. A., & Frolov, O. O. (2017). Spectral analysis of allogeneic hydroxyapatite powders
Acknowledgement:
We acknowledge the support of the National Interest Infrastructure facility IOSIN – CETAL at INFLPR.
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