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J Dent Res 81(2): 123-128, 2002
© 2002 International and American Associations for Dental Research

RESEARCH REPORT
Biomaterials & Bioengineering

Dynamic Viscoelasticity of Soft Liners and Masticatory Function

H. Murata1,*, N. Taguchi1, T. Hamada1, M. Kawamura1, and J.F. McCabe2

1 Department of Prosthetic Dentistry, Hiroshima University Faculty of Dentistry, 1-2-3 Kasumi, Minami-ku, Hiroshima,734-8553, Japan; and
2 Dental Materials Science Unit, The Dental School, University of Newcastle upon Tyne, Framlington Place, Newcastle upon Tyne, NE2 4BW, United Kingdom;

*corresponding author, hmurata{at}hiroshima-u.ac.jp

Soft denture liners are used for edentulous patients to cushion functional forces. We hypothesized that the application of soft liners having viscoelastic properties would lead to the most marked improvement in masticatory function. The shear storage modulus (G'), shear loss modulus (G''), and loss tangent (tan {delta}) were determined for 6 materials by means of a dynamic viscoelastometer. Masticatory function of ten subjects was evaluated by measurements of maximum bite forces and chewing times and frequencies for 2 food samples, and by the use of visual analogue scales. The acrylic materials exhibited viscoelastic behavior, while the silicones exhibited elastic behavior. The improvement in masticatory function compared with hard resin was found to be in the order: acrylic permanent materials > silicone > acrylic temporary materials. The results suggest that the use of materials with higher tan {delta} and G' provides the most optimum masticatory function for patients requiring the provision of soft liners on their dentures.

KEY WORDS: soft denture liners • dynamic viscoelastic properties • masticatory function • visual analogue scales






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