Comparative Evaluation Of Bond Strength Between Denture Base-Artificial Teeth

This study investigates the bond strength (BS) and deflection at maximum load (DL) between denture teeth and denture base resin in milled monolithic units, comparing it with bond strengths of 3D-printed teeth to a 3D-printed base, separate-unit milled teeth to a milled base, and prefabricated teeth to heat-cured acrylic resin, both prior to and following thermocycling. A total of 100 specimens, each with a denture tooth attached to a cylindrical base, were fabricated using four methods: 3D printing, conventional compression molding, and milling, including two milled monolithic groups (MMG-1, MMG-2) and a separate-unit milled system (SMG). These methods created integrated or separate units, bonded with adhesive resin cement. The study adhered to ISO Standard 19736, measuring BS and DL before and after thermocycling. Data were analyzed using Shapiro-Wilk test, one-way ANOVA, and post hoc Tukey tests (α = 0.05). The BS of MMG-1 (p=0.016) and SMG (p=0.029) significantly decreased after thermocycling, while other groups showed insignificant reductions. SMG had the lowest mean BS and DL, indicating the weakest bonding and greatest rigidity. Only the conventional group showed a statistically significant drop in DL after thermocycling (p=0.001). The MMG-1 exhibits the highest DL values, indicating greater flexibility and deformation under thermal testing, along with the highest BS values. In contrast, SMG shows the lowest deflection rate, indicating superior rigidity. 3D printing has deflection values similar to SMG but with significantly less deformation than conventional method.