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The purpose of this study is to investigate the denture design and displaceability of residual ridge mucosa and its relation to the load distribution on the remaining oral structures. In this study, the effects of the location of rest and displaceability of the mucosa were demonstrated utilizing the two-dimensional non-linear analysis reported on Part 1. The results were as follows. 1. Mesial rest could be simulated on the finite element model using pin element. 2. Removable partial denture with mesial rest distributed more stress on the mesial abutment teeth than that with distal rest. 3. Lesser displaceability of residual ridge mucosa resulted in a decrease of stress concentration around the most distal abutment and the uniform stress distribution on residual ridge was increased. 4. In the simulated condition where an increased pressure was applied on the mucosa, the behavior of the saddle on the mucosa with large displaceability could be similar to that of the mucosa with small displaceability. The results of this study suggested that mesial rest on the most distal abutment and pressure impression was desirable in removable partial denture with distal-extension.

nihon hotetsu shika gakkai zasshi

Study on the dynamic behavior of mandibular distal-extension removable partial denture utilizing finite element method. Part 2. Influence of the location of rest and displaceability of residual ridge mucosa.