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The effect of hydrofluoric acid and resin cement formulation on the bond strength to lithium disilicate ceramic
Sundfeld, Daniel; Palialol, Alan Rodrigo Muniz; Fugolin, Ana Paula Piovesan; Ambrosano, Gláucia Maria Bovi; Correr-Sobrinho, Lourenço; Martins, Luis Roberto Marcondes; Pfeifer, Carmem Silvia.
  • Sundfeld, Daniel; Ingá University Center - UNINGÁ. School of Dentistry. Department of Restorative Dentistry and Prosthodontics. Maringá. BR
  • Palialol, Alan Rodrigo Muniz; Ingá University Center - UNINGÁ. School of Dentistry. Department of Restorative Dentistry and Prosthodontics. Maringá. BR
  • Fugolin, Ana Paula Piovesan; Ingá University Center - UNINGÁ. School of Dentistry. Department of Restorative Dentistry and Prosthodontics. Maringá. BR
  • Ambrosano, Gláucia Maria Bovi; Ingá University Center - UNINGÁ. School of Dentistry. Department of Restorative Dentistry and Prosthodontics. Maringá. BR
  • Correr-Sobrinho, Lourenço; Ingá University Center - UNINGÁ. School of Dentistry. Department of Restorative Dentistry and Prosthodontics. Maringá. BR
  • Martins, Luis Roberto Marcondes; Ingá University Center - UNINGÁ. School of Dentistry. Department of Restorative Dentistry and Prosthodontics. Maringá. BR
  • Pfeifer, Carmem Silvia; Ingá University Center - UNINGÁ. School of Dentistry. Department of Restorative Dentistry and Prosthodontics. Maringá. BR
Braz. oral res. (Online) ; 32: e43, 2018. tab, graf
Article in English | LILACS | ID: biblio-889490
Responsible library: BR1.1
ABSTRACT
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.
Subject(s)

Full text: Available Index: LILACS (Americas) Main subject: Ceramics / Dental Bonding / Resin Cements / Dental Porcelain / Hydrofluoric Acid Language: English Journal: Braz. oral res. (Online) Journal subject: Dentistry Year: 2018 Type: Article / Project document Affiliation country: Brazil Institution/Affiliation country: Ingá University Center - UNINGÁ/BR

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Full text: Available Index: LILACS (Americas) Main subject: Ceramics / Dental Bonding / Resin Cements / Dental Porcelain / Hydrofluoric Acid Language: English Journal: Braz. oral res. (Online) Journal subject: Dentistry Year: 2018 Type: Article / Project document Affiliation country: Brazil Institution/Affiliation country: Ingá University Center - UNINGÁ/BR