[Laser-induced photoacoustic effects in the dentin].
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.
Bräucker
G
G
Institut für Angewandte Physik, Rheinische Friedrich-Wilhelms-Universität Bonn.
Lubatschowski
H
H
Koort
H J
HJ
Ertmer
W
W
Frentzen
M
M
D055592:Biophysical Phenomena; D001703:Biophysics; D003804:Dentin / Q000528:radiation effects / Q000601:surgery*; D004307:Dose-Response Relationship, Radiation; D006801:Humans; D066298:In Vitro Techniques; D017075:Laser Coagulation / Q000295:instrumentation; D008567:Membranes, Artificial; D011145:Polyvinyls / Q000528:radiation effects; D013997:Time Factors; D014159:Transducers; D014466:Ultraviolet Rays; D005465:Fluorocarbon Polymers
D008567:Membranes, Artificial; D011145:Polyvinyls; C024865:polyvinylidene fluoride; D005465:Fluorocarbon Polymers
Laserinduzierte photoakustische Effekte im Dentin.