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Effect of duration of Er,Cr:YSGG laser etching on dentin morphology: an in vitro study

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Abstract

Introduction

The aim of this study was to evaluate the effect of different durations of Er,Cr:YSGG laser irradiation on dentin morphology using scanning electron microscopy (SEM).

Materials and methods

Twenty-five extracted human-impacted permanent third molars were cut below the occlusal pit and fissure level, perpendicular to the long axis of the tooth. An occlusal area measuring 5 mm in length and 5 mm in width was prepared on each tooth for laser irradiation. The teeth were randomly divided into five groups for different durations of laser irradiation: T1, 5 s; T2, 10 s; T3, 20 s; T4, 40 s; T0, no laser irradiation. The effects of laser application on dentin surfaces were evaluated using SEM at × 80 and × 500 magnifications. Also, the presence/absence of smear layer was scored according to SEM findings. Score 0 indicated the absence and score 1 indicated the presence of smear layer.

Results

Forty seconds of irradiation resulted in an irregular dentin surface without smear layer, with open dentinal tubules and without enlargement.

Conclusion

Laser preparation of dentin creates a retentive surface for composite restoration, without the problems caused by smear layer after conventional preparation. Also, the disadvantages of acid etching can be avoided as such.

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Authors and Affiliations

  1. Dental Branch, Department of Restorative Dentistry, Islamic Azad University, Tehran, Iran

    F. Mahdisiar & S. Akhoundan

  2. Laser Research Center of Hamadan Medical Science University, Hamadan, Iran

    A. Mirzaei

  3. Clinic of Conservative Dentistry, Periodontology and Prevention, University Hospital of the RWTH Aachen, Aachen, Germany

    A. Fallah & N. Gutknecht

Authors
  1. F. Mahdisiar
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  2. A. Mirzaei
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  3. A. Fallah
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  4. N. Gutknecht
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  5. S. Akhoundan
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Corresponding author

Correspondence to S. Akhoundan.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Informed consent

This article was done on extracted human third molars, and it does not include any human participant. For this type of study, formal consent is not required.

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Mahdisiar, F., Mirzaei, A., Fallah, A. et al. Effect of duration of Er,Cr:YSGG laser etching on dentin morphology: an in vitro study. Laser Dent Sci 2, 213–219 (2018). https://doi.org/10.1007/s41547-018-0038-z

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  • DOI: https://doi.org/10.1007/s41547-018-0038-z

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