1025 Long-term viscoelastic properties of soft lining material containing fluorinated monomer

Friday, March 23, 2012: 3:30 p.m. - 4:45 p.m.
Presentation Type: Poster Session
Y. KASUGA1, Y. HOSHINO2, M. INOUE2, H. IBARAKI1, Y. NAGASAWA1, Y. HIBINO1, H. TAKAHASHI3, Y. SUMI4, S. MINAKUCHI2, and H. NAKAJIMA1, 1Dental Biomaterials Science, Meikai University School of Dentistry, Saitama, Japan, 2Complete Denture Prosthodontics, Tokyo Medical & Dental University, Tokyo, Japan, 3Oral Biomaterials Engineering, Tokyo Medical & Dental University, Tokyo, Japan, 4National Center for Geriatrics and Gerontology, Aichi, Japan
Objectives: The properties of an experimental soft lining material containing a fluorinated monomer were compared to those of commercially available materials in an effort to develop a new soft lining material with long-term stable viscoelastic properties.

Methods: The experimental material containing Tridecafluorooctyl-methacrylate was prepared (FSL). The two commercial products examined were an acrylic-based soft lining material (VertexSoft, VVS) and a silicone rubber-based soft lining material (Molloplast-B, DMB).  Cylindrical specimens (10mm in diameter, 10mm high, n=5) were fabricated for each material.  The viscoelastic properties of the specimens were measured using a creepmeter. Changes in the displacement of the probe with loading were recorded as immediate elastic displacement after immersion in deionized water at 37C for 1, 28, 84 or 168 days. The displacement data were statistically analyzed by ANOVA /Tukey's HSD test at a significance level of 0.05.

Results: The immediate elastic displacement values (mm, mean ± sd) were as follows (after 1-, 28-, 84- and 168-day displacement, respectively): 0.40±0.13, 0.40±0.05, 0.39±0.02 and 0.36±0.05 for FSL; 0.41±0.01, 0.20±0.01, 0.18±0.01 and 0.17±0.05 for VVS; and 0.74±0.05, 0.75±0.04, 0.72±0.04 and 0.69±0.04 for DMB. Significant effects (p<0.0001) were found in two main factors (lining materials and immersion period), and their interaction ANOVA. The immersion period significantly decreased the immediate elastic displacements of VVS; however, it did not change the immediate elastic displacements of FSL and DMB (p>0.05).

Conclusions: In the present study, the experimental material FSL appeared to have long-term, stable viscoelastic properties, as did DMB, suggesting that the fluorinated monomer can be applied to soft denture lining materials. This study was supported in part by a Grant-in-Aid for Young Scientists (B) (No. 23792274) from JSPS and in part by a Research Grant for Longevity Sciences (No. 23-20) from the MHLW, Japan.

Keywords: Dental materials, Prosthodontics and Viscoelastic properties