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Proceedings Paper

Evaluation of the cavity margins after Er:YAG laser ablation of the enamel and dentin
Author(s): Tatjana Dostalova M.D.; Otakar Krejsa M.D.; Helena Jelinkova; Karel Hamal
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Paper Abstract

This study investigates the checks of cavity margin after enamel and dentin ablation. The Er:YAG laser enamel and dentin ablation can be directly connected with the danger of cracks originating in the enamel near the cavity. This study evaluates the quality of the enamel edges after Er:YAG laser preparation. The enamel and dentin of buccal surfaces were ablated by the Er:YAG laser radiation. An Erbium:YAG laser system with the energy of 200 mJ was used to generate 200 microsecond(s) long pulses of mid-infrared 2.94 micrometers light in multimode configuration. The laser was operating in a free running mode, the repetition rate being 0.5 Hz with average laser power of 100 mW. Laser radiation was focused on the tooth tissue. Water cooling was used during the procedure in order to prevent tooth tissue destruction. The time of laser preparation was 5 minutes. A cavity of class V was prepared. The teeth were immersed into 0.5% basic fuchsin and then centrifuged at 6000 rev/min for 20 minutes. The microphotographs of the margins stained with 0.5% basic fuchsin were made and then the longitudinal section of the teeth were evaluated. The micrographs of the longitudinal section were checked and measured afterwards. The effect of the investigated laser irradiation on the origin of cracks was analyzed in the scanning electron microscope. Micrographs of each tooth before and after the laser ablation were compared. Micrographs of the intact teeth after extraction present the cracks of the enamel. They depend on the pressure exerted during extraction. The influence of the laser ablation proper is it bears no signs of new cracks. The conclusions of this study demonstrate the non-invasive nature of the Er:YAG laser ablation of the hard dental tissues.

Paper Details

Date Published: 23 December 1994
PDF: 6 pages
Proc. SPIE 2327, Medical Applications of Lasers II, (23 December 1994); doi: 10.1117/12.197594
Show Author Affiliations
Tatjana Dostalova M.D., Institute of Dental Research (Czech Republic)
Otakar Krejsa M.D., Institute of Dental Research (Czech Republic)
Helena Jelinkova, Czech Technical Univ. (Czech Republic)
Karel Hamal, Czech Technical Univ. (Czech Republic)

Published in SPIE Proceedings Vol. 2327:
Medical Applications of Lasers II
Stephen G. Bown; J. Escourrou; Frank Frank; Herbert J. Geschwind M.D.; Guilhem Godlewski M.D.; Frederic Laffitte; Hans H. Scherer M.D., Editor(s)

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