TY - JOUR
T1 - The effect of hydrofluoric acid and resin cement formulation on the bond strength to lithium disilicate ceramic
AU - Sundfeld, Daniel
AU - Palialol, Alan Rodrigo Muniz
AU - Fugolin, Ana Paula Piovesan
AU - Ambrosano, Gláucia Maria Bovi
AU - Correr-Sobrinho, Lourenço
AU - Martins, Luis Roberto Marcondes
AU - Pfeifer, Carmem Silvia
N1 - Funding Information:
This work was supported by Fapesp [São Paulo State Research Foundation, grant numbers 2013/26573-7 and 2014/23320-3] and NIH/NIDCR [1R15 DE023211 01 A1 and U01 DE02756 02].
Publisher Copyright:
© 2018. Brazilian Oral Research. All Rights Reserved.
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
KW - Dentin
KW - Electron microscope tomography
KW - Hydrofluoric acid
KW - Resin cements
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U2 - 10.1590/1807-3107bor-2018.vol32.0043
DO - 10.1590/1807-3107bor-2018.vol32.0043
M3 - Article
C2 - 29846386
AN - SCOPUS:85049257126
VL - 32
JO - Pesquisa odontologica brasileira = Brazilian oral research
JF - Pesquisa odontologica brasileira = Brazilian oral research
SN - 1806-8324
M1 - e43
ER -