Hydrodynamic model for ultrashort-pulse albation of hard dental tissue

Richard A. London; David S. Bailey; David A. Young; W. Edward Alley; Michael D. Feit; Alexander M. Rubenchik; Joseph Neev

doi:10.1117/12.238772

23 April 1996 Hydrodynamic model for ultrashort-pulse albation of hard dental tissue

Richard A. London, David S. Bailey, David A. Young, W. Edward Alley, Michael D. Feit, Alexander M. Rubenchik, Joseph Neev

Author Affiliations +

Proceedings Volume 2672, Lasers in Dentistry II; (1996) https://doi.org/10.1117/12.238772
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

A computational model for the ablation of tooth enamel by ultra-short laser pulses is presented. The role of simulations using this model in designing and understanding laser drilling systems is discussed. Pulses of duration 300 fsec and intensity greater than 10¹² W/cm² are considered. Laser absorption proceeds via multi-photon initiated plasma mechanism. The hydrodynamic response is calculated with a finite difference method, using an equation of state constructed from thermodynamic functions including electronic, ion motion, and chemical binding terms. Results for the ablation efficiency are presented. An analytic model describing the ablation threshold and ablation depth is presented. Thermal coupling to the remaining tissue and long-time thermal conduction are calculated. Simulation results are compared to experimental measurements of the ablation efficiency. Desired improvements in the model are presented.

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Richard A. London, David S. Bailey, David A. Young, W. Edward Alley, Michael D. Feit, Alexander M. Rubenchik, and Joseph Neev "Hydrodynamic model for ultrashort-pulse albation of hard dental tissue", Proc. SPIE 2672, Lasers in Dentistry II, (23 April 1996); https://doi.org/10.1117/12.238772

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