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Bond strength of bulk fill composite to teeth prepared with Er
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Keywords

Composite resins
Lasers
Adhesiveness
Dental materials

How to Cite

1.
Benati MR de L, Baioni JC, Souza AGC de, Ferraz LN, Oliveira ALBM de, Vitti RP, et al. Bond strength of bulk fill composite to teeth prepared with Er: YAG laser. Braz. J. Oral Sci. [Internet]. 2022 Dec. 19 [cited 2024 Jul. 17];22(00):e238727. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8668727

Abstract

Aim: The present in vitro study aimed to evaluate the bond strength of a bulk fill composite on dentin surfaces prepared with the Er: YAG laser. Methods: Twenty-four permanent third molars were selected and divided into 2 groups: CP - Conventional preparation with high-speed handpiece (control) and LA (laser) - Preparation with Er: YAG laser. The occlusal surface was removed to expose coronal dentin, which was subsequently prepared with a high-speed handpiece or Er: YAG laser (350mJ, 4Hz, 1.5 ml/min water flow). Both groups were restored with Filtek One Bulk Fill (3M ESPE) composite resin. After 24 hours, the samples were evaluated for microtensile bond strength (μTBS), fracture pattern, and scanning electron microscopy (SEM). Results: The data obtained in the μTBS test were submitted to t-test (α=0.05). The results showed no difference in μTBS when the different types of cavity preparation were compared (ρ=0.091). Fracture patterns revealed the prevalence of cohesive fracture in composite resin in CP (83.3%) and adhesive fracture in LA (92.1%). In the SEM analysis, the LA group demonstrated the presence of gaps between the composite resin and the irradiated dentin surface. The hybrid layer exhibited more regularity with the presence of longer and uniform resin tags in the CP group. Conclusion: The type of cavity preparation did not influence the values of bulk fill composite resin μTBS to dentin. Fracture patterns and scanning electron microscopy analyses suggested less interference at the adhesive interface in preparations performed using CP.

https://doi.org/10.20396/bjos.v22i00.8668727
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Copyright (c) 2022 Marcos Roberto de Lima Benati, Jean Carlos Baioni, Amanda Guerra Cavalcante de Souza, Laura Nobre Ferraz, Ana Luisa Botta Martins de Oliveira, Rafael Pino Vitti, Renata Siqueira Scatolin

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