No abstract

No abstract

Optoacoustic measurements were carried out in order to obtain better understanding of the ablation mechanisms during the illumination of hard dental tissue by Er:YAG laser radiation. A broadbard microphone was used to detect laser generated acoustic waves in the ambient air. Correlation analysis of tht laser pulse spikes and the response of the optoacoustic probe indicates that each laser spike ablates the har i dental tissue independently of other spikes. This is in agreement with the model of ablation by means of micro explosions. The optoacoustic signal is observed to be approximately linearly related to the ablation efficiency, and is thus demonstrated to be a good measure of the ablation efficiency. The experiments als) show a significant difference in optoacoustic signals obtained during ablation in caries, enamel and dentin.

No abstract

No abstract

No abstract

No abstract

No abstract