Effect of low-concentration hydrofluoric acid etching on shear bond strength and biaxial flexural strength after thermocycling

You Jung Kang, Yooseok Shin, Jee Hwan Kim

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6 Citations (Scopus)

Abstract

This study evaluated the shear bond strength (SBS) and biaxial flexural strength (BFS) of resin cements according to the surface treatment method using low-temperature hot etching with hydrofluoric acid (HF) on a yttrium-stabilized tetragonal zirconia (Y-TZP) surface; 96 discs and 72 cubes for BFS and SBS tests for Y-TZP were randomly divided into four groups of BFS and three groups of SBS. Specimens were subjected to the following surface treatments: (1) no treatment (C), (2) air abrasion with 50 μm Al2O3 particles (A), (3) hot etching with HF at 100 °C for 10 min (E), and (4) air abrasion + hot etching (AE). After treatments, the specimens were coated with primer, and resin cement was applied with molds. The specimens were evaluated for roughness (Ra) via scanning electron microscopy and x-ray diffraction, and the data were analyzed by an analysis of variance (ANOVA) and Kruskal-Wallis tests. Group E produced significantly higher SBS compared to group A and AE before and after thermocycling. The BFSs of all groups showed no significant differences before thermocycling; however, after thermocycling, C and E treatment groups were significantly higher compared to group A and AE. All groups showed phase transformation. Group E was observed lower monoclinic phase transformation compared to other groups.

Original languageEnglish
Article number1409
JournalMaterials
Volume13
Issue number6
DOIs
Publication statusPublished - 2020 Mar 1

Bibliographical note

Funding Information:
Acknowledgments: This study was supported by a faculty research grant of Yonsei University College of Dentistry (6-2018-0014).

Publisher Copyright:
© 2020 by the authors.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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