IADR Abstract Archives
Flexural Properties of New Denture Base Materials (Comparative Study)
Objectives: The most commonly used denture base material, heat-cured polymethyl-methacrylate (PMMA), shows non-ideal mechanical properties mainly, the flexural strength. Some new materials have been developed. One of them, as claimed by some authors, can be used as a potential alternative to heat-cured PMMA in terms of flexural strength. They are namely Eclipse a light-curing polymer based on the monomer UDMA, and Weropress a cold-cured PMMA pourable type. We compare the flexural properties of these two materials with that of conventional PMMA-based materials to establish whether the new materials can be used as substitutes for the conventional ones.
Methods: Four materials were selected (Table 1). 10 bar-shaped samples (70, 10, 3.5mm) were made for each material following each manufacturer’s instructions. After curing, finishing and polishing, the samples’ flexural strength and modulus were measured (3-point bend test, 5 mm/min, 50mm span, Instron 5567).
Results: The results of the flexural strength and modulus values can be seen in table 1. No significant differences were found between the Eclipse specimens and the heat-cured and cold-cured specimens for both strength and modulus (P>0.05, Kruskal Wallis test). Weropress specimens exhibited low strength and modulus values that were significantly different from heat-cured and Eclipse materials (P<0.05).
Conclusions: Within the limitations of the current study, Eclipse showed a potential for use as denture-base materials, which was as strong and stiff as heat cured specimens. While Weropress specimens showed a significant difference to the currently used heat-cured materials. Further work is now required to see how these properties change over time, for instance after storage in an aqueous environment
Methods: Four materials were selected (Table 1). 10 bar-shaped samples (70, 10, 3.5mm) were made for each material following each manufacturer’s instructions. After curing, finishing and polishing, the samples’ flexural strength and modulus were measured (3-point bend test, 5 mm/min, 50mm span, Instron 5567).
Results: The results of the flexural strength and modulus values can be seen in table 1. No significant differences were found between the Eclipse specimens and the heat-cured and cold-cured specimens for both strength and modulus (P>0.05, Kruskal Wallis test). Weropress specimens exhibited low strength and modulus values that were significantly different from heat-cured and Eclipse materials (P<0.05).
Conclusions: Within the limitations of the current study, Eclipse showed a potential for use as denture-base materials, which was as strong and stiff as heat cured specimens. While Weropress specimens showed a significant difference to the currently used heat-cured materials. Further work is now required to see how these properties change over time, for instance after storage in an aqueous environment