1 May 1995 Caries selective ablation: the handpiece
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Proceedings Volume 2394, Lasers in Dentistry; (1995); doi: 10.1117/12.207442
Event: Photonics West '95, 1995, San Jose, CA, United States
Caries selective ablation is fixed to a window of fluences predicted by the ablation thresholds of carious and healthy dentin, respectively. The aim of the study was to develop a dental handpiece which guarantees homogeneous fluence at the irradiated tooth surface. Furthermore the point of treatment should be cooled down without energy losses due to the cooling system. We suggest the direct coupling of the laser radiation into a laminar stream of liquid, which acts in turn as a lengthened beam guide. The impacts of the laser radiation and of the cooling medium fall exactly into the same point. Hot ablation debris is removed out of the crater by the flush of the water jet. Fluences are constant if the handpiece is used in contact mode or at a distance. Normally the surface of a bare fiber working in contact mode is destroyed after a few shots. Coupling the laser radiation into a stream of liquid prevents this destruction. Putting together the benefits of this special handpiece short overall treatment times seem to be possible. High average power can be applied to the tooth without the threat of thermal damage. Furthermore no time consuming cutting of the fiber prolongs the treatment time.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thomas Hennig, Peter Rechmann, Andreas Holtermann, "Caries selective ablation: the handpiece", Proc. SPIE 2394, Lasers in Dentistry, (1 May 1995); doi: 10.1117/12.207442; https://doi.org/10.1117/12.207442

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