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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-24 23:05 |
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Conference: Bucharest University Faculty of Physics 2021 Meeting
Section: Polymer Physics
Title:
Influence of Light Curing Protocol on Volumetric
Dimensional Change Of Dental Resin Composites. A New Approach Based on Raman Spectroscopy
Authors:
Eduard GATIN (1, 2), Catalin LUCULESCU (3), Stefan IORDACHE (4), Roxana R. ILICI (2)
Affiliation:
1) University of Bucharest, Faculty of Physics, Materials Department, P.O. Box MG - 11, Magurele – Bucharest, Romania
2) University of Medicine “Carol Davila”, Faculty of Medicine, Blv. Eroii Sanitari 8, Sector 5, Bucharest, Romania
3) National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG- 36, Magurele – Bucharest, Romania
4) University of Bucharest, 3Nano-SAE Research Centre, P.O. Box MG- 38, Magurele, Romania;
E-mail
masterdent2009@yahoo.com
Keywords:
dental composites, filler, resin matrix, polymerization, pycnometer, RAMAN spectroscopy
Abstract:
Filler – polymer matrix coupling determines, to a large extent, the mechanical strength and clinical longevity of dental composites. Incorporation of filler into resin matrix greatly influences and improves material properties provided that filler particles are bonded to polymer matrix or otherwise it may weaken the resin. The dimensional stability of resin composite materials is affected by polymerization shrinkage, degree of conversion, thermal contraction and expansion, and interactions with an aqueous environment. It has been reported that the same degree of conversion is produced by a fixed amount of energy density, but we suggest to account for variations in irradiation intensity, time and working mode of the curing lamp. In our study it was used a curing LED lamp (Light emitting diodes, λ = 420 ÷ 480 nm), with different curing programs (variable light intensity, different time rates and mixed). Materials used through our investigation were two composites resins (RBC) with the same polymer matrix, but different filler (micro/nano filler). For sample properties evaluation there were used pycnometer technique (pycnometer from Paul Marienfeld Gmbh, Germany) and RAMAN spectroscopy technique (MiniRam Equipment from B&W Tek Inc, USA; 785 nm laser source). Results obtained are trying to suggest a better protocol for light curing process, for better mechanical properties and biocompatibility of the dental resin-based composites (RBC).
References:
1. Kramer N., Lochbauer U., Garcia – Godoy F., Frankerberger R. (2008). Light curing of resin-based composites in the LED era. Am J Dent, 21 (3), 135 – 142.
2. Chutinan S., Platt J.A., Cochran M.A., Moore B.K. (2004). Volumetric dimensional change of six direct core materials. Dent Mater, 20 (4), 345 – 351.
3. Sculmerich M. V., Surface and trascutaneous Raman spectroscopy, imaging and tomography, ProQuest Publishing House 2009, Ann Arbor MI – USA.
4. Larkin P., Infrared and Raman Spectroscopy; Principles and Spectral Interpretation, Elsevier Publishing House 2011.
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