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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Sundfeld, Daniel [1] ; Muniz Palialol, Alan Rodrigo [2] ; Fugolin, Ana Paula Piovesan [3] ; Bovi Ambrosano, Glaucia Maria [4] ; Correr-Sobrinho, Lourenco [2] ; Marcondes Martins, Luis Roberto [2] ; Pfeifer, Carmem Silvia [3]
Total Authors: 7
[1] Inga Univ Ctr UNINGA, Sch Dent, Dept Restorat Dent & Prosthodont, Maringa, PR - Brazil
[2] Univ Estadual Campinas Unicamp, Piracicaba Dent Sch, Dept Restorat Dent, Piracicaba, SP - Brazil
[3] OHSU, Dept Restorat Dent, Div Biomat & Biomech, Portland, OR - USA
[4] Univ Estadual Campinas Unicamp, Piracicaba Dent Sch, Dept Social Dent, Piracicaba, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Brazilian Oral Research; v. 32, 2018.
Web of Science Citations: 3

To investigate how the hydrofluoric acid (HF) concentrations applied to a lithium disilicate glass-ceramic (EMX) affects the surface morphology and microtensile bond strength (mu TBS) 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 mm(2) sticks for mu TBS 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 (alpha = 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 mu TBS when compared to 1% for BisGMA/TEGDMA formulation (p < 0.05); whereas HF 1% and 5% showed similar mu TBS values when compared to 10% HF for BisGMA/TEGDMA/UDMA resin matrix (p > 0.05) at both storage times. Water aging decreased the mu TBS 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. (AU)

FAPESP's process: 14/23320-3 - Influence of hydrofluoric acid concentration and previous thermal treatment on bond strength of lithium disilicate glass ceramic to a dual-cure resin cement modified by thio-urethane
Grantee:Daniel Sundfeld Neto
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 13/26573-7 - Effects of hydrofluoric acid concentration and thermal treatment on bond strenght to dental ceramic
Grantee:Daniel Sundfeld Neto
Support type: Scholarships in Brazil - Doctorate