Tooth pulp reaction following Er:YAG laser application

Er:YAG laser irradiation was performed on dental hard substances of beagle dogs. Two, 4, 6 and 8 weeks after laser exposure at various intensities and repetition rates the teeth and especially the pulps were analyzed histologically. No reaction of the pulp was found after enamel or pulpfar dentine exposure to the laser beam even at a radiant exposure of 30 J/cm2 per pulse. Fluorescent marking sections of the teeth showed neoformation of calcified dentin after 6 and 8 weeks following laser light impact to the pulpnear dentin or artificial opening of the pulp cavity. These results correspond to the observations of pulp microcirculation during Er:YAG laser irradiation.