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Evaluation of viscoelastic properties, hardness, and glass transition temperature of soft denture liners and tissue conditioner

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Abstract

Soft denture liners and tissue conditioners are widely used for the denture patients to cushion masticatory force and condition abused tissues, respectively. This study assessed methods for the evaluation of the viscoelasticity and glass transition temperature (Tg) of the silicone permanent soft liner, acrylic permanent soft liner, and tissue conditioner. Three rheological parameters of storage modulus (E′), loss modulus (E′′), and loss tangent (\(\tan \delta\)), Tg, and hardness were determined using dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), and the Shore A0 hardness test. Five specimens were measured for each material. The time–temperature superposition principle was applied to produce master curves of E′, E′′, and \(\tan \delta\) for the tested materials at a reference temperature of 37 °C. The acrylic permanent soft liner and tissue conditioner exhibited viscoelastic behavior and sensitivity to frequency, especially at lower frequencies. The silicone permanent soft liner showed elastic behavior and was frequency-independent. Tg for the acrylic permanent soft liner was higher than that for the tissue conditioner, which in turn was higher than that for the silicone permanent soft liner for both DMA and DSC. In DMA, a higher frequency led to higher Tg values. A positive linear relationship was found between Shore A0 hardness and E′ values, but not E′′ and \(\tan \delta\) values. Shore hardness reflects elasticity, but not viscosity. The results of the present study can be used to improve methods for evaluating the viscoelasticity and Tg of soft denture liners and tissue conditioners.

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Acknowledgements

This work was supported by JSPS KAKENHI under Grant number 17H04393.

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Authors and Affiliations

  1. Department of Prosthetic Dentistry, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki, 852-8588, Japan

    Yukiro Kitagawa, Kazuhiro Yoshida, Kazuma Takase & Hiroshi Murata

  2. Department of Dental and Biomedical Materials Science, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki, 852-8588, Japan

    Alireza Valanezhad & Ikuya Watanabe

  3. Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishiku, Fukuoka, 819-0395, Japan

    Ken Kojio

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  1. Yukiro Kitagawa
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  2. Kazuhiro Yoshida
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Correspondence to Hiroshi Murata.

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Kitagawa, Y., Yoshida, K., Takase, K. et al. Evaluation of viscoelastic properties, hardness, and glass transition temperature of soft denture liners and tissue conditioner. Odontology 108, 366–375 (2020). https://doi.org/10.1007/s10266-019-00477-9

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  • DOI: https://doi.org/10.1007/s10266-019-00477-9

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