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The present study evaluated the dynamic viscoelastic behavior of commercially available dental composites by a Split Hopkinson pressure bar (SHPB) test machine. Five commercially available composite resins--namely, two conventional hybrid composites (Filtek Z100, Z100; Filtek Z250, Z250), a packable composite (Filtek P60, P60), a flowable composite (Filtek Flow, FL), and a nanofill composite (Filtek Supreme, SU)--were evaluated. By means of SHPB technique, the dynamic stress-strain curve, storage modulus, and loss tangent of the five dental composites were calculated. All specimens exhibited a nonlinear stress-strain curve in the loading process, which resulted not only from the viscoelasticity--but also from the plasticity--of matrix. In terms of storage modulus, no significant differences were exhibited among the five dental composites (p &gt; 0.05). In terms of loss tangent, Z100 showed a significantly higher value than P60, FL, and SU (p &lt; 0.05). Within the limitations of this investigation using SHPB, it was indicated that the loss tangent increased with increasing filler content.

Dynamic Viscoelastic Behavior of Dental Composites Measured by Split Hopkinson Pressure Bar