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Proceedings Paper

Evaluation of depth and profile cavity after laser ablation with different energy of Er:YAG laser radiation
Author(s): Tatjana Dostalova M.D.; Helena Jelinkova; Karel Hamal; Otakar Krejsa M.D.; Jiri Kubelka; Stanislav Prochazka
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Paper Abstract

Depth and profile cavity were studied after laser ablation with different energy of Er:YAG laser beam. Longitudinal sections of extracted human teeth were cut and polished to the flat surfaces. The thickness of layer of prepared teeth was from 3 to 5 mm. The check group contained glazed samples of ivory with the similar thickness. The Er:YAG laser drilling machine was operating in a free-running mode. For the preparation we used the energy up to 500 mJ. The repetition rate was 1 or 2 Hz. The laser radiation was focused on the tooth surface using CaF2 lens (f equals 55 mm). During the experiment, teeth were steady and the radiation was delivered by the mechanical arm which was fixed in a special holder. The fine water mist (water - 50 ml/min with the pressure to atm, air-pressure three atm) was used. Samples with the flat surfaces from the enamel, dentin and ivory were irradiated with five different energies from 100 to 500 mJ. Quantities of one, five, ten, twenty and thirty pulses were used. The depth of cavity and its profile were observed and measured. It was found that depth of cavity depends on the value of energy, type of hard dental tissue and number of pulses. With increasing energy or number of pulses the saturation effect in depth of holes in dentine or enamel were proved.

Paper Details

Date Published: 19 January 1996
PDF: 6 pages
Proc. SPIE 2623, Medical Applications of Lasers III, (19 January 1996); doi: 10.1117/12.230319
Show Author Affiliations
Tatjana Dostalova M.D., Institute of Dental Research (Czech Republic)
Helena Jelinkova, Czech Technical Univ. (Czech Republic)
Karel Hamal, Czech Technical Univ. (Czech Republic)
Otakar Krejsa M.D., Institute of Dental Research (Czech Republic)
Jiri Kubelka, Preciosa-Crytur, Ltd. (Czech Republic)
Stanislav Prochazka, Preciosa-Crytur, Ltd. (Czech Republic)

Published in SPIE Proceedings Vol. 2623:
Medical Applications of Lasers III
Stephen G. Bown; Herbert J. Geschwind M.D.; Raimund Hibst; Frederic Laffitte; Giulio Maira; Roberto Pini; Hans-Dieter Reidenbach; Hans H. Scherer M.D.; Pasquale Spinelli, Editor(s)

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