Abstract
The aim of this study was to investigate the dynamic viscoelasticity of dental soft polymer material containing citrate ester-based plasticizers. Three kinds of citrate ester-based plasticizer (Citroflex® C-2: TEC, Citroflex® A-2: ATEC, and Citroflex® A-4: ATBC), with the combination of 5 wt% ethyl alcohol, were used as the liquid phase. The dynamic viscoelastic properties of nine ethyl methacrylate polymers: (A, B, C, D, E, F, G, H, and I) were immersed in 37 °C distilled water for 0, 1, 3, 7, 14 and 30 days, respectively. The dynamic viscoelastic properties were measured at 37 °C with an automatic dynamic mechanical analyzer. The shear storage modulus (G′), shear loss modulus (G″), and loss tangent (tan δ) were determined at 1 Hz. These parameters were statistically analyzed by two-way and one-way ANOVA and Tukey’s multiple comparison test at a predetermined significance level of 0.05. A significant difference was found among the materials in terms of the dynamic viscoelasticity. The materials containing citrate ester-based plasticizer ATBC showed the most stable dynamic viscoelasticity. Considering the limitations of this study, the results suggest that the inclusion of citrate ester-based plasticizer can improve the durability of dental soft polymer materials.
Highlights
Soft polymer materials have specific and unique viscoelastic properties and are often used in the dental field as resilient denture liners and tissue conditioners [1,2,3]
Hz before the immersion are (G′′), and loss tangent with 1 Hz before the immersion in distilled water are shown in Significant differences were found among the different materials
Significant differences were found among different materials
Summary
Soft polymer materials have specific and unique viscoelastic properties and are often used in the dental field as resilient denture liners and tissue conditioners [1,2,3] In this context, tissue conditioners are widely used for the treatment of alveolar mucosal lesions, such as decubitus ulcers. Various types of soft polymer materials for dental use that can be applied as tissue conditioners have been developed and widely used in clinical prosthetics as a pre-treatment to restore the alveolar mucosa to its normal state when a denture wearer has lesions of the alveolar mucosa [2].
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