To determine and compare the impact strength of three kinds of heat cured acrylic resin, namely, Meliodent HC, Acron HC, Lucitone 199; one kind of microwave acrylic resin, namely, Acron MC; one kind of visible light curing resin, namely Triad VLC; and one kind of cold cured acrylic resin, namely Meliodent CC.
Methods:
A total of 60 specimens (75mm x 10mm x 3mm) were fabricated, 10 from each material. The impact strength was evaluated using the Charpy method. The test was performed at room temperature in an impact testing machine (Zwick Pendulum Impact tester, Germany) of a capacity of 0-7.5 joule scale; the specimens were fractured. For statistical analysis, Kruskal-Wallis test followed by Dunn's multiple comparison test were used.
Results:
The impact strength values exhibited statistically significant differences among acrylic denture resin groups (p=0.0001). The mean impact strength (Joule) was as follows:
Lucitone 199 0.56 ± 0.063, Acron MC 0.32 ± 0.048, Acron HC 0.31 ± 0.046, Meliodent HC 0.27 ± 0.048, Meliodent CC 0.20 ± 0.055, Triad VLC 0.16 ± 0.042.
Conclusion:
Within the limitations of this study, Lucitone 199 showed the highest mean impact strength value among the materials tested.