Effect of duration of Er,Cr:YSGG laser etching on dentin morphology: an in vitro study
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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.
Forty seconds of irradiation resulted in an irregular dentin surface without smear layer, with open dentinal tubules and without enlargement.
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.
KeywordsEr,Cr:YSGG laser Dentin conditioning SEM Dentin morphology Phosphoric acid etching
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
This article does not contain any studies with human participants or animals performed by any of the authors.
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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