Influence of the hydration state on the ultrashort laser ablation of dental hard tissues.

Lasers in Medical Science
Francisco de Assis M G Rego FilhoMaria Tereza de Araujo

Abstract

Since about 40 years, laser-based surgical tools have been used in medicine and dentistry to improve clinical protocols. In dentistry, femtosecond lasers have been claimed to be a potential ablation tool. It would, however, be good to perform a more fundamental investigation to understand ablation interaction mechanisms and possible side effects, depending on different specific components of the target tissue. The goal of this study is to show the changes of ablation characteristics in the femtosecond regime at different levels of structural water within dental hard tissues. Thirty human teeth samples were split into three hydration groups and subdivided into dentin and enamel groups (n = 5). The specimens were irradiated using a 70-fs Ti:sapphire laser (with a 1-kHz repetition rate and a 801-nm wavelength output). Ablation was performed using five different power levels and three exposure times. The results clearly show an inversely proportional dependence of the ablation threshold to the hydration level of the tissues. A known mathematical model was adapted in order to include the influence of the changes on the relative fractional composition of dental hard tissues. This analysis was consistent with the experimental results ...Continue Reading

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Citations

Oct 10, 2013·Photomedicine and Laser Surgery·Fabiana Aparecida Mayrink de Oliveira, Hélady Sanders-Pinheiro
Sep 2, 2020·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Sarathkumar LoganathanMuthukumaraswamy Arunachalam
Oct 16, 2015·Journal of Biomedical Optics·Cristian-Alexander TuleaPeter Loosen

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