Heat treatment-improved bond strength of resin cement to lithium disilicate dental glass-ceramic

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

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

This study investigated the influence of different hydrofluoric acid (HF) concentrations and heat treatments applied to a lithium disilicate dental glass-ceramic (EMX) on surface morphology and micro-shear bond strength (μSBS) to resin cement. Five HF concentrations (1%, 2.5%, 5%, 7.5% and 10%) and four different heat treatments applied before etching were assessed: 1. etching at room temperature with no previous heat treatment (control group); 2. HF stored at 70 °C for 1 min applied to the ceramic surface at room temperature; 3. HF at room temperature applied after a hot air stream is applied perpendicularly to the ceramic surface for 1 min; 4. The combination of previously heated HF and heated EMX surface. The etching time was fixed for 20 s for all groups. Etched EMX specimens were analyzed on field-emission scanning electron microscope (FE-SEM) and the μSBS was carried out on a universal testing machine at a crosshead speed of 1 mm/min until fracture. For the control groups, FE-SEM images showed greater glassy matrix dissolution and higher μSBS for 7.5% and 10% HF concentrations. The previous heat treatments enhanced the glassy matrix dissolution more evidently for 1%, 2.5% and 5% and yielded increased μSBS values, which were not statistically different for 7.5% and 10% HF concentrations (control group). HF concentrations and previous heat treatments did show to have an influence on the etching/bonding characteristics to lithium disilicate dental glass-ceramic.

Original languageEnglish (US)
Pages (from-to)10071-10078
Number of pages8
JournalCeramics International
Volume42
Issue number8
DOIs
StatePublished - Jun 1 2016

Keywords

  • B. Electron microscopy
  • B. Surfaces
  • C. Strength
  • D. Glass ceramics
  • E. Biomedical applications

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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    Sundfeld, D., Correr-Sobrinho, L., Pini, NÃ. I. P., Costa, A. R., Sundfeld, R. H., Pfeifer, C., & Martins, L. R. M. (2016). Heat treatment-improved bond strength of resin cement to lithium disilicate dental glass-ceramic. Ceramics International, 42(8), 10071-10078. https://doi.org/10.1016/j.ceramint.2016.03.112