Effect of Sandblasting Surface Treatment on the Bond Strength and Surface Roughness Between the 3D-Printed Denture Base and Silicon-Based Soft Liner.

Abstract

Purpose:The study was conducted to evaluate the effect of surface treatment through sandblasting on the bond strength between the 3D-printed denture base and silicon-based lining material.Material and Methods: Twenty dumbbell-shaped specimens were fabricated from 3D-printed denture base material, grouping of the specimens was carried out into the following: group I (control group): (n=10) The specimens relined without surface treatment and group II (experimental group): (n=10) The specimens received surface treatment with 125 µm Al 2 O 3 airborne-particle abrasion before relining with silicon-based soft liner. After relining, a universal testing machine was used to measure the tensile bond strength for all the specimens, and the debonded surfaces were visually examined to detect the mode of failure. Surface roughness was measured and surface topography was observed by Atomic Force Microscope (AFM), the scanned area measured 10*10 µm with a number of data points 256*256, a scanning rate of 1 Hz. Results:The effect of sandblasting on the tensile bond strength between the 3D-printed denture base and silicon-based soft lined was statistically significant P-value ≤ 0.05, and the statistical analysis for the values of surface roughness before and after sandblasting revealed a high significance P-value ≤ 0.001. Conclusion:Surface treatment of the 3D-printed denture with125 µm Al 2 O 3 prior to siliconbased soft-liner application, improves the surface roughness and enhances the tensile bond strength. Which in turn decreases possible failures that occurred in the bond of soft-lined dentures.