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Journal of Dental Research, Vol. 81, No. 2, 123-128 (2002)
DOI: 10.1177/154405910208100208

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;


Figure 1
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  		Figure 1. Dependence of G' (A), G'' (B), and tan {delta} (C) on frequency for 6 soft denture liners. Markers indicate the 6 materials: Hydro-Cast (), Visco-Gel (O), Molloplast-B ({blacksquare}), Tokuyama Soft Relining ({square}), COE Super-Soft ({blacktriangleup}), and Soft Reverse ({triangleup}).

 

Figure 2
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  		Figure 2. Mean values of G' (A), G'' (B), and tan {delta} (C) of 6 soft denture liners at 1 Hz. Error bars are standard deviations (n = 5). Connecting bars indicate no significant difference (p > 0.05) by ANOVA and Tukey tests.

 

Figure 3
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  		Figure 3. Box-Whisker plots of maximum bite forces (A), chewing times (B), and chewing frequencies (C) for the chewing of two test food samples ( , a hard food; {rectangle} , a soft food), and VAS values (D) for ten subjects with lined complete mandibular dentures. N = 10. Friedman test indicated significant differences among the denture liners for maximum bite forces ({chi}2 = 23.52, df = 3, p < 0.0001), chewing times for a hard food ({chi}2 = 14.25, df = 3, p < 0.005) and a soft food ({chi}2 = 7.98, df = 3, p < 0.05, p < 0.05), chewing frequencies for a hard food ({chi}2 = 14.88, df = 3, p < 0.005), and VAS values ({chi}2 = 23.88, df = 3, p < 0.0001). No significant differences were found among the materials for chewing frequencies for a soft food ({chi}2 = 2.43, df = 3, p = 0.49). o = outliers, + = extremes.

 

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