CO<sub>2</sub> laser free-form processing of hard tissue

Martin Werner; Manfred Klasing; Mikhail Ivanenko; Daniela Harbecke; Hendrik Steigerwald; Peter Hering

doi:10.1117/12.728436

13 July 2007 CO₂ laser free-form processing of hard tissue

Martin Werner, Manfred Klasing, Mikhail Ivanenko, Daniela Harbecke, Hendrik Steigerwald, Peter Hering

Proceedings Volume 6632, Therapeutic Laser Applications and Laser-Tissue Interactions III; 663202 (2007) https://doi.org/10.1117/12.728436
Event: European Conferences on Biomedical Optics, 2007, Munich, Germany

Abstract

Drilling and surface processing of bone and tooth tissue belongs to standard medical procedures (bores and embeddings for implants, trepanation etc.). Small circular bores can be generally quickly produced with mechanical drills. However problems arise at angled drilling, the need to execute drilling procedures without damaging of sensitive soft tissue structures underneath the bone or the attempt to mill small non-circular cavities in hard tissue with high precision. We present investigations on laser hard tissue "milling", which can be advantageous for solving these problems. The processing of bone is done with a CO₂ laser (10.6 &mgr;m) with pulse durations of 50 - 100 &mgr;s, combined with a PC-controlled fast galvanic laser beam scanner and a fine water-spray, which helps keeping the ablation process effective and without thermal side-effects. Laser "milling" of non-circular cavities with 1 - 4 mm width and about 10 mm depth can be especially interesting for dental implantology. In ex-vivo investigations we found conditions for fast laser processing of these cavities without thermal damage and with minimised tapering. It included the exploration of different filling patterns (concentric rings, crosshatch, parallel lines, etc.), definition of maximal pulse duration, repetition rate and laser power, and optimal water spray position. The optimised results give evidence for the applicability of pulsed CO₂ lasers for biologically tolerable effective processing of deep cavities in hard tissue.

Citation Download Citation

Martin Werner, Manfred Klasing, Mikhail Ivanenko, Daniela Harbecke, Hendrik Steigerwald, and Peter Hering "CO₂ laser free-form processing of hard tissue", Proc. SPIE 6632, Therapeutic Laser Applications and Laser-Tissue Interactions III, 663202 (13 July 2007); https://doi.org/10.1117/12.728436

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