The effect of hydrofluoric acid and resin cement formulation on the bond strength to lithium disilicate ceramic

Daniel Sundfeld, Alan Rodrigo Muniz Palialol, Ana Paula Piovesan Fugolin, Gláucia Maria Bovi Ambrosano, Lourenço Correr-Sobrinho, Luis Roberto Marcondes Martins, Carmem Pfeifer

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Abstract

To investigate how the hydrofluoric acid (HF) concentrations applied to a lithium disilicate glass-ceramic (EMX) affects the surface morphology and microtensile bond strength (μTBS) of ceramics to dentin, using light-cured resin cements with or without UDMA. Sixty-three EMX square ceramic blocks were etched for 20 seconds using different HF concentrations (1%, 5% and 10%) and luted to dentin using two types of resin cement combinations: BisGMA/TEGDMA and BisGMA/TEGDMA/UDMA (n = 10). Each bonded EMX-dentin block was sectioned to obtain 1 mm2 sticks for μTBS evaluation. Half of the sticks were tested after 24 hours and the other half was assessed after 6 months of water storage. Data were statistically assessed using split-plot three-way ANOVA and multiple comparisons were performed using the Tukey's post hoc test (α = 0.05). One EMX sample from each HF concentration was analyzed using field-emission scanning electron microscope (FE-SEM) to characterize the etching pattern. According to the FE-SEM images, increasing the concentration of HF from 1 to 5 and then to 10% led to increased removal of glassy matrix and greater exposure of lithium disilicate crystals. The 10% HF concentration yielded higher μTBS when compared to 1% for BisGMA/TEGDMA formulation (p < 0.05); whereas HF 1% and 5% showed similar μTBS values when compared to 10% HF for BisGMA/TEGDMA/UDMA resin matrix (p > 0.05) at both storage times. Water aging decreased the μTBS values (p < 0.05), except when 10% HF was associated with BisGMA/TEGDMA resin cement. Resin cement formulation and hydrofluoric acid concentrations can interfere with the immediate and long-term glass-ceramic bond strength to dentin.

Original languageEnglish (US)
Pages (from-to)e43
JournalBrazilian Oral Research
Volume32
DOIs
Publication statusPublished - May 24 2018

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ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Sundfeld, D., Palialol, A. R. M., Fugolin, A. P. P., Ambrosano, G. M. B., Correr-Sobrinho, L., Martins, L. R. M., & Pfeifer, C. (2018). The effect of hydrofluoric acid and resin cement formulation on the bond strength to lithium disilicate ceramic. Brazilian Oral Research, 32, e43. https://doi.org/10.1590/1807-3107bor-2018.vol32.0043