Effect of Airborne-particle Abrasion on 3-dimensional Surface Roughness and Characteristic Failure Load of Fiber-reinforced Posts
The Journal of Prosthetic Dentistry
Statement of problem
Debonding is the most common complication of fiber-reinforced posts (FRPs). Airborne-particle abrasion (APA) has been suggested to increase resin cement adhesion to the surface of FRPs. However, which abrasion protocol is the most favorable is unclear.
The purpose of this in vitro study was to compare the surface roughness and characteristic failure load of three FRP systems following different APA protocols.
Material and methods
A total of 150 posts from 3 manufacturers (glass FRP, quartz FRP, and zirconia-enriched glass FRP) were randomly assigned to different surface treatments (NT: no treatment—control; E0: cleaned with 96% ethanol solution; E2: APA for 2 seconds/mm2—ethanol cleaned, E5: APA for 5 seconds/mm2—ethanol cleaned; and E10: APA for 10 seconds/mm2—ethanol cleaned) forming 15 groups in total. APA was performed with 50-μm aluminum oxide. Each post was observed under a 3-dimensional (3D) laser microscope, and average 3D surface roughness (Sa) was measured. Failure was induced with a universal testing machine. Two specimens per group were evaluated under the same microscope to evaluate failure patterns. Surface roughness data were analyzed with the Welch ANOVA (α=.05), followed by the post hoc Games-Howell test. Failure load differences were determined by 2-parameter Weibull statistics and likelihood ratio contour plots (95% confidence bounds).
Statistically significant differences were found in the mean surface roughness among the groups (Welch ANOVA, P
APA significantly increased surface roughness in all post systems. APA effects on characteristic failure load were dependent on the material used.