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Influence of cyclic loading on the adhesive effectiveness of resin‐zirconia interface after femtosecond laser irradiation and conventional surface treatments
Author(s) -
Vicente María,
Gomes Ana L.,
Montero Javier,
Rosel Eva,
Seoane Vicente,
Albaladejo Alberto
Publication year - 2016
Publication title -
lasers in surgery and medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 112
eISSN - 1096-9101
pISSN - 0196-8092
DOI - 10.1002/lsm.22442
Subject(s) - materials science , femtosecond , cubic zirconia , irradiation , adhesive , composite material , laser , crosshead , distilled water , universal testing machine , bond strength , layer (electronics) , optics , ultimate tensile strength , glass fiber , chemistry , ceramic , physics , chromatography , nuclear physics
Background and Objective The aim of this study was to evaluate the influence of cyclic loading on the shear bond strength (SBS) of a self‐adhesive resin cement to zirconia surfaces after femtosecond laser irradiation at different steps and several conventional surface treatments. Materials and Methods One hundred fifty square‐shaped zirconia samples were divided into five groups according their surface treatment: NT Group–no surface treatment; APA25 Group–airborne abrasion with 25 μm alumina particles; TSC Group–tribochemical silica coating; FS20 Group–femtosecond laser irradiation (800 nm, 4 mJ, 40 fs/pulse, 1 kHz, step 20); and FS40 Group–femtosecond laser irradiation (same parameters except step 40). Self‐adhesive resin cement cylinders were bonded at the centre of the zirconia surface. For each experimental group, half of the specimens were subject to cyclic loading under 90 N (50.000 cycles, 3 cycles/sec) and the rest of the specimens were stored in distilled water at 37°C. All subgroups were tested for SBS with a universal testing machine at a crosshead speed of 0.5 mm/min, until fracture. The results were analyzed statistically. Results When cyclic loading was applied, all surface treatments had lower SBS values, except APA25. The four surface treatments had the same SBS values when cyclic loading was employed. Conclusions Use of femtosecond laser irradiation could be an alternative to conventional surface treatments to achieve suitable adhesion zirconia and resin cements. Femtosecond laser irradiation at step 40 is preferable because it is more efficient and faster. Lasers Surg. Med. 48:36–44, 2016. © 2016 Wiley Periodicals, Inc.