Effect of Resilient Lining Material of Denture Base -Clinical Investigation and Model Experiment on Occlusal Force Distribution-

Resilient denture lining materials have been known as one of the effective measures for treating cases with severely atrophic mandible or with constant pain on residual ridge. The effective method of application and the mode of action of these materials, however, have not been clearly demonstrated yet. The main objective of this study was to investigate the influence of these materials on occlusal force distribution using T-Scan system. The study was carried out on six volunteer edentulous manidble patients using resilient polyolefin lining materials with two different hardness (soft and hard) . Following results were obtained. 1. In dentures with the soft resilient lining material, comparing with the hard one or the conventional resin base, the number of occlusal contact points increased and the location of contacts more widely spread within dental arch. 2. Despite the use of soft lining material, pain and discomfort were not eliminated in some subjects. Orthopantomography of these subjects suggested the topography of mandibular bone cloud has significant effect on these incidences. 3. Occlusal adjustments should be carefully performed after the insertion of denture with soft lining material.