[Changes in shape of complete dentures in the mouth]

Form changes of complete dentures were measured in 60 patients. Some of the dentures were made of Paladon 65 and the others of PMMA by the "casting method". The first check was made on the day when the denture was inserted and the last up to 90 days thereafter. In the time the denture was worn, the form changes were recorded and evaluated by means of special markings. It was found that, under masticatory load, the dentures were slightly expanded transversally by 0.2 to 0.4% in the regions of the tuberosity and the anterior teeth. It was not possible to demonstrate a clear difference in the form stability of the base material Paladon 65 and that of PMMA (using the "casting method") during the three month in which the dentures were worn.