Mechanical and thermal response of enamel to IR radiation: a finite element mesoscopic model

Ana Vila Verde; Marta M. D. Ramos

doi:10.1117/12.589640

23 March 2005 Mechanical and thermal response of enamel to IR radiation: a finite element mesoscopic model

Ana Vila Verde, Marta M. D. Ramos

Proceedings Volume 5687, Lasers in Dentistry XI; (2005) https://doi.org/10.1117/12.589640
Event: SPIE BiOS, 2005, San Jose, CA, United States

Abstract

We present finite element models of human dental enamel that account for water-pores known to exist in this material, and use them to assess the influence of these pores on the temperature and stress profiles during and after single Er:YAG (2.9 micrometer) and CO₂ (10.6 micrometer) laser pulses of duration 0.35 microsec. Our results indicate that the temperature maximum is reached at the water-pores at the end of the laser pulse; this maximum seems to be independent of pore size for the CO₂ laser but appears to be strongly dependent of pore size for the Er:YAG laser. The pressure reached at the water pore seems to be directly related to the temperature at the pore and it is significantly higher that the stress levels reached throughout the modelled structure, which indicates that water pores should play a significant role in the ablation mechanisms, even before water vaporization takes place. These results suggest that researchers conducting enamel ablation by Er:YAG lasers - or other lasers with wavelengths for which the absorption coefficients of the mineral and the water differ significantly - may want to select their samples and analyse their results taking into account factors that may alter the degree of mineralization of a tooth, such as age or type of tooth.

Citation Download Citation

Ana Vila Verde and Marta M. D. Ramos "Mechanical and thermal response of enamel to IR radiation: a finite element mesoscopic model", Proc. SPIE 5687, Lasers in Dentistry XI, (23 March 2005); https://doi.org/10.1117/12.589640

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