Tooth whitening affects bond strength of adhesive systems in enamel

AUTOR(ES)

Lima Neto, Cantídio Francisco de, Silva, Carolina Batista da, Silva, Marcos Aurélio Bomfim da, Vitti, Rafael Pino, Zanta, Carmem Lúcia de Paiva e Silva, Tonholo, Josealdo

FONTE

Matéria (Rio J.)

DATA DE PUBLICAÇÃO

06/12/2018

RESUMO

ABSTRACT This study presents how the tooth whitening affects the bond strength and fracture type of three distinct adhesives — a conventional, a self-etching, and a universal adhesive — in enamel. Health bovine incisors were prepared by flattening the labial surface; part of these teeth was submitted to whitening treatment with a peroxide-based product (WhiteGold Office© 35%). The Single Bond©, AdheSE©, or Single Bond Universal© adhesive system were used to adhere a block of restorative resin to the flat surface of the teeth. Sticks measuring 10x1x1 mm were prepared and used in microtensile tests; they were also employed to examine the type of fracture. The results are analyzed with a two-way ANOVA. For both whitened and non-whitened specimens, the adhesive systems did not give statistically different bond strength values. However, the fracture shape (classified into four types) varied from a cohesive enamel type fracture for the whitened samples to a predominantly cohesive resin type fracture for the non-whitened teeth. Therefore, the whitening procedure has exerted a weakening effect on enamel even after 21 days post-treatment.

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