Investigation of mechanical properties of conventional and self-adhesive resin cements in macro and nanoscale
DOI:
https://doi.org/10.7308/aodontol/2017.53.e03Keywords:
Resin Cements – Analysis, Hardness tests, Compressive strengthAbstract
Aim: The aim of this study was to evaluate and compare the mechanical properties of conventional and self-adhesive dual resin cements in macroscale and nanoscale.
Methods: Fifteen specimens of each brand of resin cement – AllCem (FGM), RelyX ARC (3M/ESPE), and RelyX U200 (3M/ESPE) – were made for each test performed in this study (three point bending, compression, and nanoindentation) according to the manufacturer’s instructions. The specimens were photoactivated with Optilux Demetron (Kerr) for 40 seconds and stored in the dark at 37°C for 24 hours. Subsequently, they were submitted to flexural strength and axial compression tests at a speed of 1 mm/min, as well as to the Berkovich nanoindentation test. The results of flexural strength, compressive strength, hardness, and Young’s modulus were obtained for the different mechanical tests. Data were evaluated by ANOVA tests; multiple comparisons of Tukey HSD to analyze the values of strength, hardness, and Young’s modulus among the different resin cements; and ANOVA two criteria and multiple comparisons of Games Howell to analyze the Young’s modulus within the different experiments.
Results: The results showed that AllCem obtained the highest values of flexural strength and axial compression (129±22.01, 243.71±29.75 MPa, respectively), while RelyX U200 presented the lowest values (82.35 ± 19.83, 134.57 ± 48.93 MPa, respectively). The hardness values did not differ among the studied cements. In the flexural test, the Young’s modulus values did not differ between the resin cements. In the axial compression test, AllCem presented a Young’s modulus that was statistically higher than the other cements. In the nanoindentation test, AllCem and RelyX U200 presented higher values for Young’s modulus than RelyX ARC. Young’s modulus values differed significantly among all experiments (p <0.05).
Conclusion: The values of resin cement properties can be influenced by the type of experiment (macroscale and nanoscale) performed.
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