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. 2022 Aug;85(8):2943-2952.
doi: 10.1002/jemt.24144. Epub 2022 May 12.

Influence of Er:YAG laser irradiation settings on dentin-adhesive interfacial ultramorphology and dentin bond strength

Paulo Moreira Vermelho  1 , Patricia Moreira Freitas  2 , André Figueiredo Reis  3 , Marcelo Giannini  1
Affiliations

Influence of Er:YAG laser irradiation settings on dentin-adhesive interfacial ultramorphology and dentin bond strength

Paulo Moreira Vermelho et al. Microsc Res Tech. 2022 Aug.

Abstract

This study evaluated the effects of Erbium-doped yttrium aluminium garnet (Er:YAG) laser settings and dentin bonding agents on ultramorphological characteristics of resin-laser-irradiated dentin interfaces and dentin bond strength (BS) of these adhesive systems. Additionally, dentin depth affected by Er:YAG laser irradiations was measured. The experiments were performed on occlusal dentin surfaces of third molars that were flattened with 600-grit SiC sandpaper. Treated-dentin with laser settings (250 mJ/4 Hz and 160 mJ/10 Hz) were the experimental groups, while SiC abraded dentin was the control. These three dentin treatments and three adhesives (two self-etchings and one etch-&-rinse adhesive) formed nine groups for the ultramorphology of laser-ablated dentin-adhesives interfacial analysis, using a transmission electron microscope (TEM). For BS (n = 8), the same nine groups were tested with addition of the two evaluation times (24 h after sample preparation or 1 year). The depths of Er:YAG laser effects into the dentin were measured using a TEM (n = 10). Ablated-dentin depth and BS data were analyzed by one- and three-way ANOVA, respectively, and Tukey's test (α = 0.05). Hybrid layer formation was only observed for controls, while for laser-treated dentin, adhesives were bonded to dentin with resin tags formation. Laser settings reduced the BS for all adhesives at 24 h, while at 1 year, etch-&-rinse adhesive presented the highest BS, regardless treatment (control or laser settings). Dentin depth affected by laser settings was similar. The laser irradiation altered the bonding mechanism of the adhesives to dentin and reduced the BS for self-etching adhesives. Etch-&-rinse adhesive yielded the highest BS at 1 year. Laser settings similarly affected the dentin in depth. HIGHLIGHTS: Er:YAG laser irradiation settings produced similar effects on depth and bond strength to dentin. The etch-&-rinse adhesive yielded the highest dentin bond strength regardless of the type of dentin treatment at 1 year.

Keywords: Er:YAG laser; ablation; bond strength; dentin; dentin bonding agent.

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References

REFERENCES

    1. Akin, G. E., Herguner-Siso, S., Ozcan, M., Ozel-Bektas, O., & Akin, H. (2012). Bond strengths of one-step self-etch adhesives to laser-irradiated and bur-cut dentin after water storage and thermocycling. Photomedicine Laser Surgery, 30, 214-221. https://doi.org/10.1089/pho.2011.3170
    1. Akin, M., Veli, I., Erdur, E. A., Aksakalli, S., & Uysal, T. (2016). Different pulse modes of Er:YAG laser irradiation: Effects on bond strength achieved with self-etching primers. Journal of Orofacial Orthopedics, 77, 151-159. https://doi.org/10.1007/s00056-016-0019-3
    1. Aljdaimi, A., Devlin, H., Dickinson, M., Burnett, T., & Slater, T. J. A. (2019). Micron-scale crack propagation in laser-irradiated enamel and dentine studied with nano-CT. Clinical Oral Investigation, 23, 2279-2285. https://doi.org/10.1007/s00784-018-2654-0
    1. Amaral, F. L., Colucci, V., de Souza-Gabriel, A. E., Chinelatti, M. A., Palma-Dibb, R. G., & Corona, S. A. (2008). Adhesion to Er:YAG laser-prepared dentin after long-term water storage and thermocycling. Operative Dentistry, 33, 51-58. https://doi.org/10.2341/07-30
    1. Aranha, A. C., de Paula Eduardo, C., Gutknecht, N., Marques, M. M., Ramalho, K. M., & Apel, C. (2007). Analysis of the interfacial micromorphology of adhesive systems in cavities prepared with Er,Cr:YSGG, Er:YAG laser and bur. Microscopy Research and Technique, 70, 745-751. https://doi.org/10.1002/jemt.20459

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