Shear bond strength and ultrastructural interface analysis of different adhesive systems to bleached dentin

Microscopy Research and Technique
Ernando A FerreiraRicardo Gariba Silva

Abstract

It remains unclear as to whether or not dental bleaching affects the bond strength of dentin/resin restoration. To evaluated the bond strength of adhesive systems to dentin submitted to bleaching with 38% hydrogen peroxide (HP) activated by LED-laser and to assess the adhesive/dentin interfaces by means of SEM. Sixty fragments of dentin (25 mm²) were included and divided into two groups: bleached and unbleached. HP was applied for 20 s and photoactivated for 45 s. Groups were subdivided according to the adhesive systems (n = 10): (1) two-steps conventional system (Adper Single Bond), (2) two-steps self-etching system (Clearfil standard error (SE) Bond), and (3) one-step self-etching system (Prompt L-Pop). The specimens received the Z250 resin and, after 24 h, were submitted to the bond strength test. Additional 30 dentin fragments (n = 5) received the same surface treatments and were prepared for SEM. Data were analyzed by ANOVA and Tukey's test (α = 0.05). There was significant strength reduction in bleached group when compared to unbleached group (P < 0.05). Higher bond strength was observed for Prompt. Single Bond and Clearfil presented the smallest values when used in bleached dentin. SEM analysis of the unbleached specimen...Continue Reading

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Aug 8, 2014·Photomedicine and Laser Surgery·Fabiana Almeida CurylofoAline Evangelista Souza-Gabriel
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Jan 3, 2021·Orthodontics & Craniofacial Research·Wener ChenXin Wen

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