Abstract
The purpose of this study was to evaluate the effects of post-curing and alumina-blasting on the shear bond strength of autopolymerizing acrylic resin to 3D-printed denture teeth materials. Cylindrical samples were fabricated using 3D-printed denture teeth materials. Initially, the specimens were divided into post-curing and non-post-curing groups, and autopolymerizing acrylic resin was bonded to them. Shear bond strength tests were conducted to measure the shear bond strength (n = 10). Subsequently, 10,000 thermal cycles in water were applied to the remaining specimens after post-curing. They were then divided into four groups based on different alumina particle sizes (50 μm or 110 μm) and blasting pressures (0.2 MPa or 0.4 MPa). After surface treatments, autopolymerizing acrylic resin was bonded to the specimens, followed by another 10,000 thermal cycles in water. Shear bond strength was measured using a universal testing machine (n = 10). There was no significant difference in shear bond strength with or without post-curing. However, both factors—alumina particle size and blasting pressure—significantly affected the shear bond strength; 110 μm particle size and 0.4 MPa blasting pressure exhibited significantly higher bond strength compared to 50 μm and 0.2 MPa, respectively. Alumina-blasting with 110 μ m particle size and 0.4 MPa blasting pressure can enhance the bond durability of autopolymerizing acrylic resin to post-cured 3D-printed denture teeth materials.
