Impact Absorption of Four Processed Soft Denture Liners as Influenced by Accelerated Aging

The cushioning effect of soft denture lkiners was evaluated by using a free drop test with an accelerometer. Materials tested included SuperSoft (Coe Laboratories, Chicago, IL), Kurepeet-Dough (Kreha Chemical, Tokyo), Molteno Soft (Molten, Hirshima, Japan), and Molloplast-B (Molloplast Regneri, Karlsruhe, Germany). All materials were found to reduce the impact force when compared to acrylic denture base resin. A 2.4-mm layer of soft denture material demonstrated good impact absorption, and Molloplast-B and Molteno had excellent impact absorption. When the soft denture liner was kept in an accelerated aging c hamber for 900 hours, the damping effect recorded increased for all materials tested. Aging of all materials also affected the cushioning effect.