28 May 2004 Low-threshold ablation of enamel and dentin using Nd:YAG laser assisted with chromophore with different pulse shapes
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Abstract
Neodimium laser treatment has several drawbacks when used in the hard tissue cutting, because of the low absorption of the dental tissues at its wavelength. This investigation proved that the Nd:YAG radiation is a powerful ablation tool if it is used with the dye assisted method. Several in vitro tests on enamel and dentin were accomplished changing some laser parameters to have different pulse shapes and durations from 125μs up to 1.4ms. The importance of short time high power peaks, typical of crystal lasers, in the ablation process was investigated. The pulse shapes were analyzed by their intensity in space and time profiles. A first set of results found the optimum dye concentration be used in all the following tests. Furthermore the ablation threshold for this technique was found for each different pulse shapes and durations. A low energy ablation method was found to avoid temperature increase and surface cracks formation. In vitro temperature analysis was reported comparing the differences between no dye application laser treatment and with a dye spray applied. A strong reduction of the temperature increase was found in the dye assisted method. A discussion on the general findings and their possible clinical applications is presented.
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Stefano Bonora, Stefano Bonora, Paolo Benazzato, Paolo Benazzato, Alessandro Stefani, Alessandro Stefani, Paolo Villoresi, Paolo Villoresi, } "Low-threshold ablation of enamel and dentin using Nd:YAG laser assisted with chromophore with different pulse shapes", Proc. SPIE 5313, Lasers in Dentistry X, (28 May 2004); doi: 10.1117/12.529239; https://doi.org/10.1117/12.529239
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