Bond strength of relined print and conventional denture base resins after aging

Objectives: To compare the bond strength of printed and conventionally produced denture base resins to reline after being submitted a physical-chemical aging process. Methods: Sixty specimens (10×10×3.3 mm) two (V-Print Dentbase Denture 3D+) one (Probase Hot) were relined with acrylic resins: Ufi Gel Hard C Probase Cold (n=10). The 1000 cycles thermal fluctuations (5-55ºC) 28 days pH using pH=3 (8 h/day) pH=7 (16 h/day). Then, shear was evaluated (1 KN; 1 mm/min), failure mode classified as adhesive, cohesive, or mixed type. Data analyzed Kruskal-Wallis t-tests (=0.05). Results: Bond values ranged from 8.9 21.5 MPa. No statistically significant (p=0.07) differences found between three resins. resin did not significantly affect However, relining Hot yielded higher (p<0.001) than C. Only Hot-Ufi group revealed 100% failures adhesive Conclusions: obtained similar chemical