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Proceedings Paper

Comparison of preparation speed of Er:YAG laser and conventional drilling machine
Author(s): Helena Jelinkova; Tatjana Dostalova; Libuse Dolezalova; Otakar Krejsa; Karel Hamal; Jiri Kubelka; Stanislav Prochazka
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Paper Abstract

Clinical tests of the caries treatment with a Er:YAG laser system have been very promising. The problem of the Er:YAG laser drilling machine is the speed of preparation. It is not possible to increase the laser energy and repetition rate because this process is directly connected with temperature elevation. Therefore attention has been paid to define the differences between the classical and the laser drilling effect with a safe but effective laser energy and repetition rate. For the experiment, an Er:YAG laser drilling machine with an articulated arm was designed. Thirty samples of extracted human teeth were cut by both this system and classical drilling machine. The circumference, area and structure of surface sections were observed and analyzed. From the comparison of the measured time of preparation significant differences followed from the time of preparation. The time of preparation related to 1 mm2 of the cut surface was 5.42 sec for the Er:YAG laser machine and 0.66 sec for the classical method. From this comparison it follows that the laser system is 8 times slower than the classical preparation technique. In both cases the roughness of the surface analyzed by SCAN was found similar. Also, there were no differences between the distribution of the elements, especially calcium and phosphorus.

Paper Details

Date Published: 15 May 1997
PDF: 9 pages
Proc. SPIE 2973, Lasers in Dentistry III, (15 May 1997); doi: 10.1117/12.273573
Show Author Affiliations
Helena Jelinkova, Czech Technical Univ. (Czech Republic)
Tatjana Dostalova, Institute of Dental Research (Czech Republic)
Libuse Dolezalova, Institute of Dental Research (Czech Republic)
Otakar Krejsa, Institute of Dental Research (Czech Republic)
Karel Hamal, Czech Technical Univ. (Czech Republic)
Jiri Kubelka, Preciosa-Crytur, Ltd. (Czech Republic)
Stanislav Prochazka, Preciosa-Crytur, Ltd. (Czech Republic)

Published in SPIE Proceedings Vol. 2973:
Lasers in Dentistry III
Harvey A. Wigdor; John D. B. Featherstone; Peter Rechmann, Editor(s)

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