Shear Bond Strength of Repair Materials by Different Polymerization Methods on 3D-Printed Denture Bases.

This article investigates the shear bond strength (SBS) of denture repair materials polymerized by different methods on 3D-printed denture bases fabricated via digital light processing (DLP), compared to conventional autopolymerized polymethyl methacrylate (PMMA) denture bases. The study found that light-polymerized repair materials exhibited significantly higher SBS values than autopolymerized materials regardless of the denture base type or thermal aging, with no significant effect of thermocycling on bond strength. Cohesive failures within the denture base were more frequent in 3D-printed specimens repaired with light-polymerized resin, indicating stronger adhesion, while PMMA specimens predominantly showed adhesive failures. The results suggest that 3D-printed denture bases can be repaired effectively using light-polymerized materials in a manner comparable to conventional PMMA bases.