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Comparative ultrastructural analysis of Er:YAG laser scanner and conventional method for tooth cavity preparation

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Abstract

Purpose

This study has compared morphological characteristics of dentin and enamel surfaces after cavity preparation by conventional methods and Er:YAG laser irradiation in different settings by using an Er:YAG laser scanner.

Methods

Thirty-five human teeth were randomly divided into seven groups that received cavity preparations as follows: G1 and G2 with high-speed drill with diamond and carbide burs, respectively, and G3 to G7 with Er:YAG laser scanner (λ = 2940 nm) operating at pulse energies (energy densities) of 420 mJ (840 J/cm2), 490 mJ (980 J/cm2), 560 mJ (1120 J/cm2), 630 mJ (1260 J/cm2) and 700 mJ (1400 J/cm2), respectively. The lased groups were treated with Er:YAG laser scanner in non-contact mode, keeping both frequency (20 Hz) and pulse duration (300 μs) fixed. Samples were sectioned and scanning electron micrographs of the lateral wall of the cavities were taken at different magnifications.

Results

The results showed that both groups of conventional cavity preparations exhibited enamel and dentin surfaces covered by smear layer, with no dentin-enamel boundary being identifiable. All lased groups showed clear enamel-dentin boundaries and clean surfaces of enamel and dentin with different micro-morphologies. The morphology of lased dental surfaces presented homogeneous alterations.

Conclusions

The Er:YAG scanner-assisted cavity preparation produced topographies in the entire dental surfaces and whose morphological characteristics were more favourable to further adhesion of resin restorations than the conventional ones.

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Acknowledgements

The authors would like to thank the Aachen University and the University of Sao Paulo for their support. Prof. Marques is supported by CNPq.

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Authors and Affiliations

  1. Department of Conservative Dentistry, Periodontology and Preventive Dentistry, University of Aachen, 52056, Aachen, Germany

    Sayan Roy Chowdhury, René Franzen & Norbert Gutknecht

  2. Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, 05508-000, Brazil

    Márcia Martins Marques, Ana Clara Fagundes Pedroni, Lívia Tosi Trevelin & Gabriela Laranjeira Abe

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  1. Sayan Roy Chowdhury
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  2. Márcia Martins Marques
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  3. René Franzen
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Correspondence to Márcia Martins Marques.

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Chowdhury, S.R., Marques, M.M., Franzen, R. et al. Comparative ultrastructural analysis of Er:YAG laser scanner and conventional method for tooth cavity preparation. Laser Dent Sci 1, 23–31 (2017). https://doi.org/10.1007/s41547-017-0003-2

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  • DOI: https://doi.org/10.1007/s41547-017-0003-2

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