J Prosthodont. 2024 Aug 31. doi: 10.1111/jopr.13934. Online ahead of print.
ABSTRACT
PURPOSE: The aim of this study was to evaluate the impact of mechanical roughening, adhesive applications, and aging on the bonding between CAD-CAM denture base materials with distinct chemical contents and hard relining material.
MATERIALS AND METHODS: A total of 300 denture base specimens were produced by additive, subtractive, and conventional heat-polymerization techniques (N = 100). The specimens have been classified into five subgroups based on the particular surface treatments administered (n = 20): (1) Hard relining material’s adhesive application (control); (2) Tungsten carbide bur application for 1 min, and hard reline material’s adhesive application; (3) Airborne-particle abrasion (APA) with 110 μm Al2O3, and hard reline material’s adhesive application; (4) Scotchbond Universal application; and (5) Visio.link application. Representative specimens from each subgroup were examined under a Scanning Electron Microscope (SEM). Subsequently, self-cure hard relining material was condensed in the center of the specimens. Half of the specimens were thermally aged with 5000 cycles at 5°C-55°C. The shear bond strength (SBS) test was performed, and failure loads were recorded. The data was evaluated by Robust ANOVA and Bonferroni test (p < 0.05).
RESULTS: No statistically significant difference was obtained between the production techniques (p = 0.051). The lowest SBS was observed in the control group among surface treatments, while mechanical surface treatments and universal adhesive showed the highest SBS for both aged and non-aged groups. Aging caused a significant decrease for all test groups (p = 0.001).
CONCLUSIONS: Mechanical surface treatments and universal adhesive applications are more effective for maintaining adhesion across all production techniques.
PMID:39215615 | DOI:10.1111/jopr.13934
