Femtosecond laser ablation of dentin and enamel for fast and more precise dental cavity preparation

Materials Science & Engineering. C, Materials for Biological Applications
Todor PetrovStefan Dimov

Abstract

The purpose of the present work was to achieve fast and more precise ablation in dentin and enamel by using a commercial femtosecond laser system with high repetition rate, whilst avoiding any collateral irreversible damages in the hard tissue and pulp area. We used fluence of the incident laser pulses which was marginally higher than the ablation threshold for dentin and enamel. The study was based on the hypothesis that femtosecond laser operating with a repetition rate in the range of 100-500 kHz can controllably ablate dental tissue obtaining sufficiently high removal rate whilst avoiding any collateral irreversible damages in the hard tissue and pulp area. The ablation yielded the formation of 1 mm3 craters with well-defined precise vertical cavity sides and edges. Advantageous high porosity and numerous interconnected pores were introduced in the ablated zones. Thermal load and hence collateral thermo-mechanical damages were avoided and the crystalline structure of the tooth constituent hydroxyapatite was preserved. The ultrafast femtosecond laser used in our work hold the promise of a significant drilling ability without collateral thermomechanical effects. It achieves high processing efficiency, overcomes disadvantages ...Continue Reading

Citations

Sep 2, 2020·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Sarathkumar LoganathanMuthukumaraswamy Arunachalam
Oct 4, 2018·Lasers in Medical Science·Sarathkumar LoganathanMuthukumaraswamy Arunachalam
Mar 25, 2020·Biomedical Optics Express·Jianqiao ZhengFusong Yuan
Dec 19, 2020·Journal of the Mechanical Behavior of Biomedical Materials·Sarathkumar LoganathanMuthukumaraswamy Arunachalam
Apr 29, 2021·Microscopy Research and Technique·Heitor Hussni CasarinMichelle Alexandra Chinelatti

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