1 May 1991 Caries selective ablation by pulsed lasers
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Proceedings Volume 1424, Lasers in Orthopedic, Dental, and Veterinary Medicine; (1991); doi: 10.1117/12.43995
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States
Abstract
The aim of the study was to find conditions for selective ablation of carious dentine. Absorption characteristics of healthy enamel, dentine, and carious lesions were studied by means of microspectrophotometry. It was found that in the spectral range of 330 to 520 nm optical density of carious dentine is higher by about a factor of 4 as in respect to healthy dentine. In the second part of the study, ablation thresholds were studied for different tissues at 355 nm (frequency tripled Q-switched Nd:YAG-Laser). By means of a piezoelectric detector, ultrasonic waves generated by ablation and subthreshold thermoelastic mechanisms were detected. Employing a fiber-optic delivery system, selective ablation of carious dentine occurred for pulse energies exceeding 0.4 Jcm-2 up to 1.2 Jcm-2.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thomas Hennig, Peter Rechmann, Christian G. Pilgrim, Hans-Joachim Schwarzmaier, Raimund Kaufmann, "Caries selective ablation by pulsed lasers", Proc. SPIE 1424, Lasers in Orthopedic, Dental, and Veterinary Medicine, (1 May 1991); doi: 10.1117/12.43995; http://dx.doi.org/10.1117/12.43995
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KEYWORDS
Absorption

Laser ablation

Dental caries

Pulsed laser operation

Absorbance

Medicine

Tissues

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