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Proceedings Paper

Waveguide and articulated arm for Er:YAG laser system: shape and depth of laser cavity in hard dental tissues
Author(s): Helena Jelinkova; Tatjana Dostalova M.D.; Mitsunobu Miyagi; You Wang; Yi-Wei Shi; Libuse Dolezalova; Karel Hamal; Otakar Krejsa M.D.; Jiri Kubelka; Stanislav Prochazka
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Paper Abstract

The aim of our study was to verify the efficiency of delivery systems for Er:YAG laser radiation which could be used in dentistry. The influence of increasing energy and number of pulses on a profile and depth of drilled holes was investigated. Er:YAG laser was operating in a free-running mode, generating a length of pulses 200 microsecond with a maximum energy of 500 mJ. The delivery systems investigated were an articulated arm and a fluorocarbon polymer-coated silver hollow glass waveguide. The prepared hard tissues were a sliced part of enamel, dentine and ivory. The laser radiation was directed on them by focusing optics (CaF2 lens) together with the cooling water to ensure that the tissues will not be burned. For the evaluation of shapes, depth and profiles of the prepared cavities the metallographic microscope, x-ray microtomograph and scanning electron microscope were used. From the results it was observed that the profile and depth of the cavities prepared by the laser radiation delivered by the various systems (waveguide or articulated arm) are not the same. The laser radiation delivered by waveguide produces a larger diameter cavity with a lower depth. The holes are smoother and without side effects.

Paper Details

Date Published: 22 April 1998
PDF: 11 pages
Proc. SPIE 3248, Lasers in Dentistry IV, (22 April 1998); doi: 10.1117/12.306037
Show Author Affiliations
Helena Jelinkova, Czech Technical Univ. (Czech Republic)
Tatjana Dostalova M.D., Institute of Dental Research (Czech Republic)
Mitsunobu Miyagi, Tohoku Univ. (Japan)
You Wang, Tohoku Univ. (Japan)
Yi-Wei Shi, Tohoku Univ. (Japan)
Libuse Dolezalova, Institute of Dental Research (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. 3248:
Lasers in Dentistry IV
John D. B. Featherstone; Peter Rechmann D.D.S.; Daniel Fried, Editor(s)

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