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

Todor Petrov, Emilia Pecheva, Anthony Walmsley, Stefan Dimov

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)
318 Downloads (Pure)

Abstract

Purpose
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.


Methods

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.


Results
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.


Conclusion
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 of other laser systems reported and can be used to develop an instrument for cavity preparation based on fast and precise ablation. Our further aim is to exceed the speed of traditional drilling instruments and thus to reduce the
treatment time which in turn will bring comfort to the patient.
Original languageEnglish
Pages (from-to)433-438
Number of pages6
JournalMaterials Science and Engineering C
Volume90
Issue number1
Early online date27 Apr 2018
DOIs
Publication statusPublished - 1 Sep 2018

Keywords

  • Femtosecond laser
  • laser ablation
  • dentin
  • enamel
  • dental cavity preparation

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