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Proceedings Paper

Controlled tooth surface heating and sterilization by Er:YAG laser radiation
Author(s): Raimund Hibst; Karl Stock; Robert Gall; Ulrich Keller
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Paper Abstract

Previous studies on thermal effects of Er:YAG laser tooth irradiation have considered heat as an unwanted side effect of tissue ablation.In contrast, we now investigate the potential of the Er:YAG laser for controlled heating and surface sterilization. The methods include model calculations, temperature measurements, and the investigation of bactericidal effects on natural carious lesions. Due to the strong absorption, in the initial phase of subablative irradiation, there is steep temperature gradient in the tissue, subsequently fading off by heat conduction. Using repetitive pulses and irradiation times of a few seconds, it is possible to reach a surface temperature increase (Delta) T oscillating between 100 K and a few 100 K, while keeping (Delta) T in 1.5 mm depth below 6 K. Carious surfaces can be completely sterilized. Thus the Er:YAG laser offers a new potential for controlled and sparing sterilization in dentistry.

Paper Details

Date Published: 3 December 1996
PDF: 8 pages
Proc. SPIE 2922, Laser Applications in Medicine and Dentistry, (3 December 1996); doi: 10.1117/12.260668
Show Author Affiliations
Raimund Hibst, Institut fuer Lasertechnologien in der Medizin und Messtechnik an der Univ. Ulm (Germany)
Karl Stock, Institut fuer Lasertechnologien in der Medizin und Messtechnik an der Univ. Ulm (Germany)
Robert Gall, Institut fuer Lasertechnologien in der Medizin und Messtechnik an der Univ. Ulm (Germany)
Ulrich Keller, Univ. Ulm Dental School (Germany)


Published in SPIE Proceedings Vol. 2922:
Laser Applications in Medicine and Dentistry
Gregory B. Altshuler; Fausto Chiesa; Herbert J. Geschwind; Raimund Hibst; Neville Krasner; Frederic Laffitte; Giulio Maira; Reinhard Neumann; Roberto Pini; Hans-Dieter Reidenbach; Andre Roggan; Montserrat Serra I Mila, Editor(s)

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