Effect of surface treatment on bond strength between an indirect composite material and a zirconia framework

Abstract

The present study evaluated the effect of various surface treatments for zirconia ceramics on shear bond strength between an indirect composite material and zirconia ceramics. In addition, we investigated the durability of shear bond strength by using artificial aging (20,000 thermocycles). A total of 176 Katana zirconia disks were randomly divided into eight groups according to surface treatment, as follows: group CON (as-milled); group GRD (wetground with 600-grit silicon carbide abrasive paper); groups 0.05, 0.1, 0.2, 0.4, and 0.6 MPa (airborneparticle abrasion at 0.05, 0.1, 0.2, 0.4, and 0.6 MPa, respectively); and group HF (9.5% hydrofluoric acid etching). Shear bond strength was measured at 0 thermocycles in half the specimens after 24-h immersion. The remaining specimens were subjected to 20,000 thermocycles before shear bond strength testing. Among the eight groups, the 0.1, 0.2, 0.4, and 0.6 MPa airborne-particle abraded groups had significantly higher bond strengths before and after thermocycling. The Mann-Whitney U-test revealed no significant difference in shear bond strength between 0 and 20,000 thermocycles, except in the 0.

Effect of various surface preparations on bond strength of a gingiva-colored indirect composite to zirconia framework for implant-supported prostheses

“…Alumina-blasting at a pressure of 0.2 MPa or higher led to significantly higher pre-and post-thermocycling bond strengths in the current study. This result contradicts those of earlier studies, in which alumina-blasting at pressures higher than 0.05 MPa 28) and 0.1 MPa 29) yielded superior and durable bond strengths. These conflicting results are likely principally due to the different experimental methods and materials used in the studies.…”

Dental zirconia can be etched by hydrofluoric acid

“…Zirconia treatment with 48%HF at 25 o C for 30 min resulted in a highly uneven surface compared with treatment under moderate conditions. These results are in contrast to previous studies on the etching of zirconia which used concentrations of HF ranging from 4.5-38% with etching times ranging from 1-12 min at room temperature 25,36,37,55) . These studies' results showed that HF had no effect on the zirconia surface and concluded that HF could not react with the dental zirconia ceramic surface because it is a glass-free material.…”

Bond Strenght of Zirconia Submitted to Different Surface Treatments

“…It has been reported [29] that specimens blasted with aluminum oxide particles in various pressures increase the adhesive strength, which is kept durable between the zirconia and an indirect composite. They also reported that the surface roughness increases and chemically activates the adhesive surface, removing organic contaminants from the ceramic surface.…”