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Proceedings Paper

A USPL functional system with articulated mirror arm for in-vivo applications in dentistry
Author(s): Florian Schelle; Jörg Meister; Claudia Dehn; Bernd Oehme; Christoph Bourauel; Mathias Frentzen
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Paper Abstract

Ultra-short pulsed laser (USPL) systems for dental application have overcome many of their initial disadvantages. However, a problem that has not yet been addressed and solved is the beam delivery into the oral cavity. The functional system that is introduced in this study includes an articulated mirror arm, a scanning system as well as a handpiece, allowing for freehand preparations with ultra-short laser pulses. As laser source an Nd:YVO4 laser is employed, emitting pulses with a duration of tp < 10 ps at a repetition rate of up to 500 kHz. The centre wavelength is at 1064 nm and the average output power can be tuned up to 9 W. The delivery system consists of an articulated mirror arm, to which a scanning system and a custom made handpiece are connected, including a 75 mm focussing lens. The whole functional system is compact in size and moveable. General characteristics like optical losses and ablation rate are determined and compared to results employing a fixed setup on an optical table. Furthermore classical treatment procedures like cavity preparation are being demonstrated on mammoth ivory. This study indicates that freehand preparation employing an USPL system is possible but challenging, and accompanied by a variety of side-effects. The ablation rate with fixed handpiece is about 10 mm3/min. Factors like defocussing and blinding affect treatment efficiency. Laser sources with higher average output powers might be needed in order to reach sufficient preparation speeds.

Paper Details

Date Published: 25 March 2013
PDF: 7 pages
Proc. SPIE 8566, Lasers in Dentistry XIX, 85660D (25 March 2013); doi: 10.1117/12.2007655
Show Author Affiliations
Florian Schelle, Univ. Dental Clinic Bonn (Germany)
Jörg Meister, Univ. Dental Clinic Bonn (Germany)
Claudia Dehn, Univ. Dental Clinic Bonn (Germany)
Bernd Oehme, Univ. Dental Clinic Bonn (Germany)
Christoph Bourauel, Univ. Dental Clinic Bonn (Germany)
Mathias Frentzen, Univ. Dental Clinic Bonn (Germany)

Published in SPIE Proceedings Vol. 8566:
Lasers in Dentistry XIX
Peter Rechmann; Daniel Fried, Editor(s)

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