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Ablation of carious dental tissue using an ultrashort pulsed laser (USPL) system

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An Erratum to this article was published on 28 September 2016

Abstract

The aim of the study was to investigate the efficiency of caries removal employing an ultrashort pulsed laser (USPL) and to compare the results regarding to the ablation rate of sound enamel and dentin including surface texture. The study was performed with 59 freshly extracted carious human teeth. Two cavities with an edge length of 1 × 1 mm per tooth were created: one in the dental decay and one in sound hard tissue. For this purpose a 9-W Nd:YVO4 laser with a center wavelength of 1,064 nm and a pulse duration of 8 ps at a repetition rate of 500 kHz was used. A scanner system moved the laser beam across the surface with a scan speed of 2,000 mm/s. Ablated volume and roughness R z of the cavity ground were measured using an optical profilometer. Subsequently, the specimens were cut to undecalcified sections for histological investigations. The removal of dental decay (dentin, 14.9 mm3/min; enamel, 12.8 mm3/min) was significantly higher (p < 0.05) compared to the removal of sound tissues (dentin, 4.2 mm3/min; enamel, 3.8 mm3/min). The arithmetic means of the surface roughness R z were 8.5 μm in carious enamel, 15.43 μm in carious dentin, 4.83 μm in sound enamel and 5.52 μm in sound dentin. Light microscopic investigations did not indicate any side effects in the surrounding tissues. Regarding the ablation rate of dental decay using the USPL system, caries removal seems to be much more efficient for cavity preparation.

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Acknowledgments

The authors would like to thank the Federal Ministry of Education and Research Germany (Grant No. 13 N10190) for the financial support. Moreover, thanks are given to the staff of our laboratory (Silke van Dyck, Imke Beier, Beate Schiermeyer-Dunkhase and Florian Schelle) for preparing the samples.

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Authors and Affiliations

  1. Department of Operative and Preventive Dentistry, Bonn University, Dental Faculty, Welschnonnenstrasse 17, 53111, Bonn, Germany

    Christoph Engelbach, Claudia Dehn, Jörg Meister & Matthias Frentzen

  2. Oral Technology, Bonn University, Dental Faculty, Bonn, Germany

    Christoph Bourauel

  3. Department of Conservative Dentistry, Periodontology and Preventive Dentistry, Medical Faculty, RWTH Aachen University, Aachen, Germany

    Jörg Meister

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  1. Christoph Engelbach
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  2. Claudia Dehn
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  5. Matthias Frentzen
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Correspondence to Matthias Frentzen.

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An erratum to this article can be found at http://dx.doi.org/10.1007/s10103-016-2085-6.

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Engelbach, C., Dehn, C., Bourauel, C. et al. Ablation of carious dental tissue using an ultrashort pulsed laser (USPL) system. Lasers Med Sci 30, 1427–1434 (2015). https://doi.org/10.1007/s10103-014-1594-4

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