Abstract
Observations were made on three partial edentulous models regarding the strain in a typical mandibular denture framework having a free-end saddle type, which were constructed of epoxy resin and silicone rubber. Five strain gages were attached to the positions anterior and posterior to the finishing lines and the middle portion of the major connector.The strain was measured at these positions when the saddles were vertically loaded at four points, one being at the first molar site and three being aligned bucco-lingually at the second molar site, with the weight being from 0 kg up to 6 kg. It was found that the greatest strain was observed at the major connector. On comparing with the other parts, the strain was the greatest at the position posterior to the finishing line of the loading site. The shape of the saggital cross section of the finishing line considerably affected the force distribution. A denture framework with a non-retention type finishing line decreased the amount of the strain in comparison with the butt joint type. This tendency was generally evident in the three mandibular edentulous models.
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