Bonding treatment of CAD/CAM milled denture resins repaired with visible light-cured resin

Aims: This study evaluated and compared the effect of bonding agents on the flexural strength (FS) of denture base resins repaired with visible light cured (VLC) denture resin. Methods: A total of 100 specimens (65x10x2.5 mm) were fabricated using two types of denture base materials: pre-polymerized PMMA-based blocks designed for CAD/CAM milling and conventional heat-polymerized denture base acrylic resin (control). The specimens were sectioned in the middle with 2 mm repair gap and 45° margin design. Repair surfaces were first treated with various light-cured bonding agents then repaired using VLC resin. The bonding agents either conventional or combined with acrylic primers and dual cure agents were tested. All the specimens were subjected to 3-point bending test and FS was calculated. Data were statistically analyzed using two-way analysis of variance according to the denture base material and the bonding treatments (p