Abstract
The purpose of this study was to determine the ablation rates of healthy and carious enamel and dentin on extracted human permanent molars and premolars. Measurements were taken using a flash lamp pumped pulsed 2.94 micrometers CrEr:YAG laser (pulse length 200 microsecond(s) , energy density 2-20 J/cm<SUP>2</SUP>, f equals 1-2 Hz). Teeth were cut into slices of 2 mm thickness and the ablation rates of 1450 craters were measured as a function of the energy density and pulse number. Clearly higher degrees of ablation were observed in dentin than in enamel with most effective ablation rates in carious enamel and dentin. Ablation thresholds in enamel, dentin and caries could not be detected. However, it could not be shown that there is any selectivity in caries removal by Erbium:YAG laser radiation.
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