Effect of air-borne particle abrasion and tribochemical silica coating on surface characteristics, mechanical behavior, and bonding performance of 3D-printed resin-based materials
In vitro study demonstrates superior bond stability with tribochemical silica coating in 3D-printed resin, indicating a reliable protocol for dental restorations.
Key Points
To evaluate how abrasive material, application time, and thermal aging influence the surface characteristics, mechanical properties, and bonding performance of 3D-printed resin.
Specimens were treated with 50-μm aluminum oxide (Al₂O₃) or tribochemical silica coating (SiO₂) at 2 bar for durations of 5, 10, or 15 seconds.
Surface roughness, flexural strength, elastic modulus, and shear bond strength were measured across unaged and aged (5,000 thermocycles) conditions.
Differences across groups were analyzed using analysis of variance (ANOVA) and Tukey's post hoc test at α = 0.05.
Flexural strength significantly decreased across all treated groups relative to untreated controls (p < 0.001), whereas elastic modulus showed no significant aging effect (p = 0.979).
Surface roughness was significantly affected by abrasive type, time, and their interaction (p < 0.001), with Al₂O₃ showing time-dependent roughness increases while SiO₂ remained stable across treatment times.
Shear bond strength was significantly influenced by abrasive type and application time (p < 0.05), with SiO₂ achieving higher and more stable bond strength than Al₂O₃, peaking at 10 seconds of application.