The Effect of Femtosecond Laser Treatment on the Effectiveness of Resin-Zirconia Adhesive: An In Vitro Study.

When aesthetics is compromised, dental ceramics are excellent materials for dental restorations; owing to their optical properties and biocompatibility, zirconia ceramics are particularly interesting. Self-adhesive resin cements are the most suitable for bonding to zirconia ceramics, but traditional adhesive chemistry is ineffective and surface treatments are required to improve the adhesive bonding between resin and zirconia. The aim of this study was to evaluate the effect of femtosecond laser treatment on the shear bond strength (SBS) of self-adhesive resin cement on zirconia surfaces and to contrast it with other different surface conditioning methods.

Influence of cyclic loading on the adhesive effectiveness of resin-zirconia interface after femtosecond laser irradiation and conventional surface treatments.

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.