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Dynamic viscoelastic properties of vinyl polysiloxane denture soft lining materials
Author(s) -
ABE Y.,
TAJI T.,
HIASA K.,
TSUGA K.,
AKAGAWA Y.
Publication year - 2009
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.2009.02015.x
Subject(s) - viscoelasticity , materials science , composite material , dynamic mechanical analysis , polymer
Summary The aim of this study was to investigate the dynamic viscoelastic properties of seven commercially available vinyl polysiloxane denture soft lining materials. Five rectangular specimens (2 × 10 × 30 mm) were prepared from each material. The complex modulus E* (MPa) and loss tangent (tan δ) of each specimen were determined with a non‐resonance forced vibration method using an automatic dynamic viscoelastometer at 1 Hz after 1 day of dry storage, and after 1, 30, 60, 90 and 180 days of wet storage at 37 °C. All data were analysed using one‐way anova and Bonferroni/Dunn’s test for multiple comparisons with a significance level of P < 0·01. All materials varied widely in terms of viscoelasticities and showed both an increase in E* and a decrease in tan δ at 1 Hz after the 1‐day wet storage. After 60 days of wet storage, both E* and tan δ did not change significantly. The stiffer materials (>30% filler content) with high E * values (>2·00 MPa) showed elastic behaviour with tan δ values of around 0·03. The softer materials (6% filler content) with high tan δ values (initial value > 0·10) showed viscous behaviour and were easily affected by water absorption after the 1‐day wet storage. It can be concluded that for the proper selection of vinyl polysiloxane denture soft lining materials, it is very important to evaluate the viscoelastic properties after 60 days of wet storage.