Laser-induced photoacoustic effects in the dentin] |
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Authors: | G Br?ucker H Lubatschowski HJ Koort W Ertmer M Frentzen |
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Affiliation: | Institut für Angewandte Physik, Rheinische Friedrich-Wilhelms-Universit?t Bonn. |
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Abstract: | To study photoacoustic effects in dentin caused by UV-laser ablation, laser-induced shockwaves were measured using piezoelectric PVDF films. Above the tissue-specific energy threshold for photoablation the amplitude of the acoustic shock waves is proportional to the applied laser energy density. Laser energy densities of 2 J/cm2 cause pressure amplitudes of 50 bar, densities of 20 J/cm2 cause pressure amplitudes of 1000 bar. To avoid microcracks in dentine the maximum laser energy density to prepare dentin should be limited to approximately 20 J/cm2. |
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