Abstract
For the purpose of analyzing the clinical impression procedures for the mandibular extension saddle removable partial denture, a special simulated model with an electrical pressure indicating system built into soft Silicone rubber was manufactured. The load distributions in impression procedures of the alginate, rubber and Silicone with stock tray and resin custom tray were precisely recorded. These methods were completely followed in routine clinics and the results were as follows: i) The load distribution agianst the residual ridge during the impression procedure by stock tray in alginate and heavy-bodied silicone impression materials indicated almost the same amount of mucocompression effect. ii) The rubber impression procedure by stock tray indicated non-mucocompression effect but an adequate amount of mucocompression effect was observed by resin custom tray technique. This impression technique will reduce about 70% of total denture movement during mastication. iii) The silicone impression material with resin custom tray indicated the same results as the rubber materials.
