Waveguide and articulated arm for Er:YAG laser system: shape and depth of laser cavity in hard dental tissues

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

doi:10.1117/12.306037

22 April 1998 Waveguide and articulated arm for Er:YAG laser system: shape and depth of laser cavity in hard dental tissues

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

Author Affiliations +

Proceedings Volume 3248, Lasers in Dentistry IV; (1998) https://doi.org/10.1117/12.306037
Event: BiOS '98 International Biomedical Optics Symposium, 1998, San Jose, CA, United States

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.

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Helena Jelinkova, Tatjana Dostalova M.D., Mitsunobu Miyagi, You Wang, Yi-Wei Shi, Libuse Dolezalova, Karel Hamal, Otakar Krejsa M.D., Jiri Kubelka, and Stanislav Prochazka "Waveguide and articulated arm for Er:YAG laser system: shape and depth of laser cavity in hard dental tissues", Proc. SPIE 3248, Lasers in Dentistry IV, (22 April 1998); https://doi.org/10.1117/12.306037

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