Impact strength of an experimental polyurethane-based polymer

• Main Authors: Radzi, Zamri, Abu Kasim, Noor Hayaty, Yahya, N.A., Gan, Seng Neon, Daud, N.M., Saffai, L., Fadhel, F.A.
• Format: Article
• Language: English; English
• Published: Faculty of Dentistry, University of Malaya 2007
• Subjects: R Medicine; R Medicine (General); RK Dentistry
• Online Access: http://eprints.um.edu.my/2529/1/Impact_strength_of_an_experimental_polyurethane.pdf; http://eprints.um.edu.my/2529/2/IMPACT_STRENGTH_OF_AN_EXPERIMENTAL_POLYURETHANEBASED_%28original%29.pdf; http://eprints.um.edu.my/2529/; https://ejournal.um.edu.my/index.php/adum/article/view/13784

The impact strength of a newly developed experimental polyurethane-based polymer which is derived from palm oil (Experimental PU) was compared with denture polymers; heat-cured and self cured polymethyl methacrylate (PMMA) and Eclipse®, light-activated urethane dimethacrylate prosthetic resin system. Ten specimens were prepared using heat-cured PMMA (Meliodent® Heat Cure, Heraeus Kulzer, Germany), self cured PMMA (Meliodent® Rapid Repair, Heraeus Kulzer, Germany), Eclipse® baseplate resin (Dentsply, USA) and Experimental PU material. Specimens were prepared following manufacturer�s instructions except for the Experimental PU material where it was prepared in bulk and sectioned to the desired dimension, 64 x 6 x 4 mm. A �V� notch of approximately 0.8mm in depth was machine cut across the 6mm width. Prior to the Charpy type impact test, specimens were soaked in a water bath for 50 hours at 37ºC. Eclipse® baseplate resin showed the highest impact strength (2.73 kJ/m2±0.54) followed by Meliodent® Rapid Repair (2.50kJ/m2±0.65), Meliodent® Heat Cure (1.96kJ/m2±0.42) and Experimental PU (1.04kJ/m2±0.29). One-way ANOVA showed significant interaction between materials (p<.05) and Tukey HSD revealed that Experimental PU exhibited significantly lower impact strength compared to other materials. Meliodent® Rapid Repair was not significantly different from Meliodent® Heat Cure and Eclipse® baseplate resin. It can be concluded that the Experimental PU exhibited the lowest impact strength while Eclipse® baseplate resin the highest.