COMPARATIVE ANALYSIS OF THE FRACTURE TOUGHNESS IN DIFFERENT BRANDS OF MILLED DENTURE BASE MATERIALS

Background:Denture base materials are essential in prosthodontics as they provide structural support for removable
dental prostheses. However, their long-term performance is often restricted by limited mechanical durability,
particularly fracture toughness. Although several CAD/CAM milled denture bases are commercially available,
comparative studies on their mechanical properties remain scarce.
Objectives:To evaluate and compare the fracture toughness and load-to-failure resistance of five CAD/CAM milled
denture base materials: VITA Vionic, Polident, Lucitone, CediTEC, and Ivoclar.
Results:Fifty standardized notched-beam specimens were prepared and tested according to ISO 20795-1:2013
standards using the three-point bending method. Statistical analysis (Kruskal–Wallis and post-hoc Bonferroniadjusted pairwise comparisons) revealed significant differences among the groups (p < 0.001). CediTEC and VITA Vionic exhibited significantly higher fracture toughness and load-to-failure resistance compared with the other materials, likely due to differences in manufacturing methods, material composition, and polymerization techniques.
Conclusion:CediTEC and VITA Vionic demonstrated superior mechanical performance, making them preferable
choices in clinical applications requiring high durability. The study highlights the importance of standardized testing
in guiding material selection and innovation. Further research, including long-term clinical evaluations and aging
simulations, is recommended to validate these findings and improve denture base formulations for extended clinical
use.