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. 2017 Jul;32(5):967-974.
doi: 10.1007/s10103-017-2194-x. Epub 2017 Mar 30.

The effect of Er:YAG laser irradiation on the bond stability of self-etch adhesives at different dentin depths

Muhammet Karadas  1 , İpek Çağlar  2
Affiliations

The effect of Er:YAG laser irradiation on the bond stability of self-etch adhesives at different dentin depths

Muhammet Karadas et al. Lasers Med Sci. 2017 Jul.

Abstract

The aim of this study was to evaluate the effect of Er:YAG laser irradiation on the micro-shear bond strength of self-etch adhesives to the superficial dentin and the deep dentin before and after thermocycling. Superficial dentin and deep dentin surfaces were prepared by flattening of the occlusal surfaces of extracted human third molars. The deep or superficial dentin specimens were randomized into three groups according to the following surface treatments: group I (control group), group II (Er:YAG laser; 1.2 W), and group III (Er:YAG laser; 0.5 W). Clearfil SE Bond or Clearfil S3 Bond was applied to each group's dentin surfaces. After construction of the composite blocks on the dentin surface, the micro-shear bond testing of each adhesive was performed at 24 h or after 15,000 thermal cycles. The data were analyzed using a univariate analysis of variance and Tukey's test (p < 0.05). Laser irradiation in superficial dentin did not significantly affect bond strength after thermocycling (p > 0.05). However, deep-dentin specimens irradiated with laser showed significantly higher bond strengths than did control specimens after thermocycling (p < 0.05). Thermocycling led to significant deterioration in the bond strengths of all deep-dentin groups. The stable bond strength after thermocycling was measured for all of the superficial-dentin groups. No significant difference was found between the 0.5 and 1.2 W output power settings. In conclusion, the effect of laser irradiation on the bond strength of self-etch adhesives may be altered by the dentin depth. Regardless of the applied surface treatment, deep dentin showed significant bond degradation.

Keywords: Bond stability; Dentin; Er:YAG laser; Micro-shear bond strength; Self-etch adhesive.

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Conflict of interest statement

Ethics statement

This article does not contain any studies with human participants performed by any of the authors. Human teeth were collected from the teeth extracted for reasons unrelated to this study. Thus, the ethical approval was not required. For this type of study formal consent is not required.

Conflict of interest

The authors declare that they have no conflict of interest.

Funding

The authors have no financial affiliation in the materials discussed.

Figures

Fig. 1
Fig. 1
Specimen preparation and experimental design used to measure micro-shear bond strength
Fig. 2
Fig. 2
Box plots of micro-shear bond strengths to superficial and deep dentin at 24 h and after thermocycling. Asterisk indicates statistical significance (p < 0.05). SE Clearfil SE bond, S3 Clearfil S3 bond
See this image and copyright information in PMC

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