Resistance to the Flexion of Resinous Cements of Double Polymerization

Objective: To assess the resistance of the flexion of resinous cements of double polymerization, identifying the most resistant and comparing resinous cement that are autopolymerizable with zinc phosphate cement. The resistance to flexion is the mechanical property which best explains the combination of tensions that occur clinically, for during the application of the resistance test to the flexion there are compressions, pulling, and bonding tensions occurring. Methods: Three resinous cements of double polymerization were analyzed; Rely X ARC (3M), Enforce(Dentsply), and Dual Cement(Vigodent); one resinous cement autopolymerizable Cement Post(Angelus); and one zinc phosphate cement(DFL). Each cement that was analyzed had 8 testing samples and each sample measured 30mm length, 4mm width and 4mm thick. The samples were stored in distilled water for 24 hours before the tests were started. Results: The resistance test showed averages 76.80MPa for Rely X ARC; 79.40MPa for Dual Cement; 51.87MPa for Cement Posts; and 8.96Mpa for zinc phosphate cement. The results were statistically analyzed using Analysis of Variance (ANOVA) and the Tukey Method. Conclusion: It was concluded that: the resistance to the flexion with the resinous cements of double polymerization didn't show any significant differences statistically; there were differences when comparing the resinous cements of double polymerization with the resinous cement autopolymerizable and the zinc phosphate cement; and also when comparing the last two with each other. Supported by FAPERJ