7 September 1994 Caries selective ablation: first histological examinations
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Proceedings Volume 2128, Laser Surgery: Advanced Characterization, Therapeutics, and Systems IV; (1994); doi: 10.1117/12.184922
Event: OE/LASE '94, 1994, Los Angeles, CA, United States
Abstract
The aim of this study was to determine changes in dental hard tissues after caries selective laser impact. Light and scanning electron microscopic investigations were performed. The effects of a frequency-doubled, Q-switched Alexandrite-laser (wavelength 377 nm, pulse duration 100 ns, various repetition rates) on healthy and carious dentin were studied. From the clinical and especially histological point of view, fluences in the region of the second ablation threshold of healthy dentin (3 J/cm2) were most interesting. Furthermore laser impacts with fluences up to 7 J/cm2 were studied. Fiber optics ranging in diameter from 300 to 400 micrometers were engaged. Histological examinations of craters in hard tissues were performed without decalcification of samples. Craters in dental hard tissues were sharply cut and followed closely the profile of the illuminating fiber. Crater walls demonstrated only a few microns of surface roughness. Apart from a very tiny zone due to temperature rise, surrounding hard tissues seem to be totally unaffected, anytime, cracks did not occur.
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Peter Rechmann, Thomas Hennig, "Caries selective ablation: first histological examinations", Proc. SPIE 2128, Laser Surgery: Advanced Characterization, Therapeutics, and Systems IV, (7 September 1994); doi: 10.1117/12.184922; http://dx.doi.org/10.1117/12.184922
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KEYWORDS
Dental caries

Laser ablation

Tissues

Scanning electron microscopy

Surface roughness

Cooling systems

Pulsed laser operation

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