Effect of thermal cycling and low pressure sandblasting on the bond strength of a self-adhesive cement to Y-TZP zirconia

Dino Re, Gabriele Augusti, Giuseppe Merlati, Aldo Bruno Giannì, Davide Augusti

Research output: Contribution to journalArticlepeer-review

Abstract

The aim of this investigation was to assess the influence of several surface treatments on the shear bond strength (SBS) of a self-adhesive resin cement containing 10-methacryloxydecyl-dihydrogenphosphate monomer to densely sintered zirconia ceramic, before and after thermal cycles. Hundred densely sintered zirconia cylinders were divided into five groups (n = 20). Each of them received a different surface treatment: (1) control [No-T], with the zirconia surface unconditioned, (2) low pressure air abrasion [Sand-S], (50 m, 1 bar), (3) standardized air abrasion [Sand-H], (50 m, 2.8 bar), (4) standardized Rocatec™ Plus (silica-coated alumina oxide) air abrasion (2.8 bar) and silanization [Roc-H], (5) low pressure Rocatec™ Plus (silica-coated alumina oxide) air abrasion (1 bar) and silanization [Roc-S]. Five more surface-treated specimens were addressed to scanning electron microscope for qualitative observations. After specimen fabrication, subgroups of 10 bonded samples were stored in water either for 24 h (T1) or subjected to 5000 thermal cycles (T2); SBSs were determined with a universal testing machine at a crosshead speed of 1 mm/min. At T1, mean SBSs (MPa) obtained for the examined groups were: [Sand-H] 16.24 ± 2.95; [Sand-S] 16.01 ± 2.68; [Roc-H] 17.17 ± 1.64; [Roc-S] 15.92 ± 1.99. All surface treatments positively affected (p <0.05) the initial self-adhesive cement adhesion to zirconia with respect to No-T (13.29 MPa). Artificial aging decreased the bond strength in all test groups significantly, but no spontaneous debonding was observed in [No-T]: at T2, SBS values ranged from 7.76 ± 2.37 (No-T) to 8.89 ± 1.74 (Sand-S), with no statistically significant difference between groups (p = 0.5293). Both air abrasion with alumina oxide and Rocatec™ universal bonding system, used with hard or low air pressure, produced comparable effects on cement-zirconia interface before and after thermal cycles. After artificial aging, minimal differences in bond strength values between sandblasted and control groups were not of statistical significance.

Original languageEnglish
Pages (from-to)1745-1757
Number of pages13
JournalJournal of Adhesion Science and Technology
Volume29
Issue number16
DOIs
Publication statusPublished - Aug 18 2015

Keywords

  • adhesion
  • sandblasting
  • self-adhesive cement
  • surface treatments
  • Zirconia

ASJC Scopus subject areas

  • Mechanics of Materials
  • Surfaces, Coatings and Films
  • Materials Chemistry
  • Chemistry(all)
  • Surfaces and Interfaces

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