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An evaluation of the viscoelastic characteristics of soft denture liners
Author(s) -
Tamura Fumiyo,
Suzuki Shiro,
Mukai Yoshiharu
Publication year - 2002
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.2002.00270.x
Subject(s) - polyolefin , materials science , viscoelasticity , composite material , silicone , silicone rubber , creep , natural rubber , elasticity (physics) , mold , layer (electronics)
Purpose The purpose of this study was to evaluate the viscoelastic characteristics of a group of soft denture liners by means of a creep test. Materials and Methods The materials evaluated included a silicone rubber base direct liner (Sofreliner MS), a polyolefin base indirect liner (Molteno S), and a conventional tissue conditioner (Coe Soft) as a control. Cylindrical specimens of each material were fabricated using a metal mold. Half of the specimens were subjected to mechanical fatigue with a 75‐N load at 1.2 Hz for 200,000 cycles. The creep test was performed on each material and condition with and without a fatigue test using low‐load conditions to achieve a 10% strain on all specimens. Viscosity and elasticity were measured, and the data were statistically analyzed using 1‐way analysis of variance and Fisher's Protected Least Significant Difference (PLSD) test ( p < 0.05 ). Results The silicone rubber direct liner (1.31 ± 2.1 MPa) exhibited a similar mean elastic property as the conventional tissue conditioner (0.90 ± 0.22 MPa) and an intermediate viscosity between the conventional tissue conditioner (0.11 ± 0.01 GPa · s) and polyolefin base indirect liner (9.84 ± 1.08 GPa · s). The elasticity did not change for polyolefin and silicone rubber after the fatigue process. Significant differences in the viscosity of silicone rubber were seen with and without fatigue testing ( p ≤ 0.05 ). Conclusions The silicone rubber was as soft as the tissue conditioner and softer than the polyolefin liner. The stiffer the material, the lower the permanent deformation observed.