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Proceedings Paper

Treatment of dentinal tubules by Nd:YAG laser
Author(s): Hana Chmelíčkova; Zdeňka Zapletalova; Jan Peřina; Radko Novotný; Roman Kubínek; Martin Stranyánek
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Paper Abstract

Symptom of cervical dentine hypersensitivity attacks from 10% to 15% of population and causes an uncomfortable pain during contact with any matter. Sealing of open dentinal tubules is one of the methods to reach insensibility. Laser as a source of coherent radiation is used to melt dentine surface layers. Melted dentine turns to hard mass with a smooth, non-porous surface. Simulation of this therapy was made in vitro by means of LASAG Nd:YAG pulsed laser system KLS 246-102. Eighty human extracted teeth were cut horizontally to obtain samples from 2 mm to 3 mm thick. First experiments were done on cross section surfaces to find an optimal range of laser parameters. A wide range of energies from 30 mJ to 210 mJ embedded in 0,3 ms long pulse was tested. Motion in X and Y axes was ensured by a CNC driven table and the pulse frequency 15 Hz was chosen to have a suitable overlap of laser spots. Some color agents were examined with the aim to improve surface absorption. Scanning Electron Microscopy was used to evaluate all samples and provided optimal values of energies around 50 J.cm-2. Next experiments were done with the beam oriented perpendicularly to a root surface, close to the real situation. Optical fibers with the diameter of 0,6 mm and 0,2 mm were used to guide a laser beam to teeth surfaces. Laser processing heads with lens F = 100 mm and F = 50 mm were used. The best samples were investigated by means of the Atomic Force Microscopy.

Paper Details

Date Published: 6 December 2006
PDF: 4 pages
Proc. SPIE 5945, 14th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 59451G (6 December 2006); doi: 10.1117/12.638929
Show Author Affiliations
Hana Chmelíčkova, Joint Lab. of Optics of Palacký Univ. and Institute of Physics (Czech Republic)
Zdeňka Zapletalova, Palacký Univ. (Czech Republic)
Jan Peřina, Joint Lab. of Optics of Palacký Univ. and Institute of Physics (Czech Republic)
Radko Novotný, Palacký Univ. (Czech Republic)
Roman Kubínek, Palacký Univ. (Czech Republic)
Martin Stranyánek, Joint Lab. of Optics of Palacký Univ. and Institute of Physics (Czech Republic)


Published in SPIE Proceedings Vol. 5945:
14th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics
Anton Štrba; Dagmar Senderákova; Miroslav Hrabovský, Editor(s)

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