Evaluation of the frequency and temperature dependence of the dynamic mechanical properties of acetal resins

Abstract

The purpose of this study was to evaluate and compare the dynamic mechanical properties of two acetal resins (different colored samples of the same resin), an autopolymerized reline resin, and a heat-polymerized denture base resin. Measurements were obtained in two conditions, the frequency-and temperature-dependent conditions, using a dynamic viscoelastometer. The acetal resins exhibited lower loss tangent values than the autopolymerized reline resin and heat-polymerized denture base resin. With respect to temperature dependence, all of the materials displayed stable viscoelastic properties in the temperature range found in the oral environment. The acetal resin had both a glass transition temperature and a melting point, whereas the autopolymerized reline resin and heat-polymerized denture base resin had only glass transition temperatures. The results of this study suggest that acetal resin displays elastic properties when compared with the other 2 materials.

Fabrication and Characterization of Isotropic and Anisotropic Magnetorheological Elastomers, Based on Silicone Rubber and Carbonyl Iron Microparticles

“…Notice that G′ is a curve that depends on the frequency. Moreover, the shape of curves for tanδ and the Cole–Cole diagrams are also similar to experimental curves reported in the literature [32].…”

“…The peaks observed in the tanδ curves correspond to the damping terms of the FZM, which are related to the mechanical relaxation peaks, while Figure 4b shows how the slope of the Cole–Cole diagram can be used to predict the fractional parameter values of a and b. The theoretical curves obtained for both G′ and G″ could be compared with experimental data to describe the main relaxation process of amorphous polymeric materials, as discussed in [30,31,32]. Notice that G′ is a curve that depends on the frequency.…”

CAD/CAM Diagnostic Esthetic Functional Splint (DEFS) as a Removable Prototype to Evaluate the Final Prosthetic Rehabilitation: A Narrative Review

“…Acetal resin, for its part, is a homopolymer of highly crystalline polymerized formaldehyde [26] and has been used in dentistry since 1986 for the manufacturing of clasps, partial denture frameworks, temporary bridges, implant abutments, occlusal splints [27] and screw-retained temporary fixed prostheses [28]. According to studies conducted on acetal resin as full denture material, it shows good fracture resistance and acceptable color stability [29,30].…”