Effect of fluoridated carbamide peroxide gels on enamel microtensile bond strength

Abstract

The aim of this study was to examine the resin bond strength on enamel treated with different fluoridated bleaching agents. Forty-eight bovine incisors were divided into four groups to receive bleaching treatments, over a 14-d period, as follows: no treatment; 10% carbamide peroxide (CP) bleaching; 10% CP containing 0.11% fluoride; and 10% CP containing 0.37% fluoride. Immediately, and 7 and 14 d after bleaching, the enamel surfaces were respectively bonded with composite and sectioned to create resin-enamel beams. These beams were subjected to the microtensile bond strength (microTBS) test, then assessed for failure mode under scanning electron microscopy. The results showed that the 0.37% fluoridated group demonstrated a microTBS equivalent to that of the unbleached group at all stages. Non-fluoridated and 0.11% fluoridated groups showed a weaker microTBS after bleaching but regained the bond strength after 14 or 7 d of storage, respectively. In the non-fluoridated group, adhesive failure was the predominant fracture pattern that comprised the enamel prism demineralization change and widely dispersed voids on the resin-enamel interfaces. No evident enamel erosion and fewer microporosities were found in the 0.37% fluoridated group. Accordingly, treatment with 0.37% fluoridated CP maintained the microTBS as effectively as the unbleached enamel. Additional fluoride in the bleaching agents may facilitate subsequent restorative treatment by inhibiting enamel demineralization.

Influence of fluoride-containing adhesives and bleaching agents on enamel bond strength

“…According to the authors, the positive outcome of F -addition to bleaching agents may assist subsequent restorative treatment by inhibiting enamel demineralization. 21 Failure mode patterns of CP-treated interfaces demonstrated predominance (35 to 45%) of cohesive failure in the enamel for both the bleaching agents used in this study. The cohesive failures confirm the hypothesis that bleaching may promote enamel structural changes, thus initializing fracture during debonding at the enamel rather than at the adhesive-bonded interface.…”

“…Enamel demineralization promoted by CP might have helped to lower the bond strength. Chuang et al 21 observed that 10% CP containing high F -concentrations (0.37%) was able to maintain µTBS as effectively as unbleached enamel. The authors observed that non-fluoridated and 0.11% fluoridated CP agents exhibited lower µTBS immediately after bleaching, which is in accordance with our findings, but their reported values were recovered after 7 and 14 days of storage.…”

Sodium ascorbate use in bleached teeth

“…The Fluoride use in the composition of bleaching agent was also studied order to increase the bond strength after bleaching, which was not found in the research conducted [26].…”

Efeito de antioxidantes na resistência adesiva à microtração do esmalte bovino clareado após 7 dias e 6 meses de armazenamento

“…De acordo com a literatura, dentre os testes que avaliam o comportamento das restaurações adesivas em esmalte clareado, destacam-se o teste de cisalhamento (KIMYAI;VALIZADEH 2006;KOGA;BORGES, 2006;MURAGUCHI et al 2007;GÖKÇE et al 2008;TÜRKÜN;ARICI, 2008;SASAKI;FLÓRIO;BASTING, 2009;KHOROUSHI;AGHELINEJAD, 2011) e de microtração (LAI et al, 2002ARCARI et al 2007;CHUANG et al, 2009;BARCELLOS et al, 2010;LAGO, DE FREITAS;NETTO, 2011;ROCHA GOMES TORRES et al, 2012) . Na presente pesquisa, foi utilizado o teste de microtração levando em consideração que os valores obtidos podem ser correlacionados mais precisamente aos achados clínicos (HEINTZE, 2013).…”