The effect of hydrofluoric acid concentration and heat on the bonding to lithium disilicate glass ceramic

Daniel Sundfeld, Lourenço Correr-Sobrinho, Núbia Inocêncya Pavesi Pini, Ana Rosa Costa, Renato Herman Sundfeld, Carmem Silvia Pfeifer, Luis Roberto Marcondes Martins

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16 Scopus citations


The aim of this study was to evaluate the effects of hydrofluoric acid (HF) concentration and previous heat treatment (PHT) on the surface morphology and micro-shear bond strength (μSBS) of a lithium disilicate glass ceramic (EMX) to resin cement. One hundred four EMX specimens were randomly assigned to two groups (n=52) according to the HF concentration: 5% and 10%. A new random distribution was made according to the PHTs (n=13): control (no PHT); previously heated HF (70 °C); previously heated EMX surface (85 °C); the combination of heated HF + heated EMX surface. The etching time was set at 20 s. All EMX blocks were silanated and received a thin layer of an unfilled resin. Five resin cement cylinders were made on each EMX surface using Tygon tubes as matrices, and then stored for 24 h at 37 °C. One random etched EMX sample from each group was analyzed using field-emission scanning electron microscopy (FE-SEM). The data were subjected to two-way ANOVA and multiple comparisons were performed using the Tukey post hoc test (α=0.05). For the control groups, 5% HF showed statistically lower μSBS values when compared to 10% HF (p<0.05). PHT increased the μSBS values for 5% HF, yielding statistically similar results to non-PHT 10% HF (p<0.05). FE-SEM images showed increased glassy matrix removal when PHT was applied to HF 5%, but not to the same degree as for 10% HF. PHT has the potential to improve the bond strength of 5% HF concentration on lithium disilicate glass ceramic.

Original languageEnglish (US)
Pages (from-to)727-733
Number of pages7
JournalBrazilian dental journal
Issue number6
StatePublished - Nov 1 2016


  • FE-SEM analysis
  • Heat treatment
  • Hydrofluoric acid
  • Lithium disilicate glass ceramic
  • Microshear bond strength

ASJC Scopus subject areas

  • Dentistry(all)


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