MEASUREMENTS OF VERTICAL DIMENSION OF PROCESSED DENTURES

UCH is known concerning the horizontal linear change in dimension in the methyl methaerylate denture base materials. Many investigators have reported this phase of study. " 2, ' 3The question has been raised as to what hap-pens to the vertical dimension of the denture during processing and what part methyl methacrylate denture base plays in any change in vertical dimension. Some work has been done by Schuyler, Frederich, and Vaughan,4 by making dentures and replacing them upon the articulator. Their conclusion was that they had obtained an "open-bite " by both the compression and injection method but no reason was given as to the cause of this "open bite. " Atiyyah5 employed a method that did not accurately measure the change in only the denture or in the denture base material, as some of the investing plaster had to be taken into the measuring scheme. Grunewald, Paffenbarger and Schoonover6 have also investigated this subject. All of these investigations have left something to be desired with respect to knowledge of change in vertical dimension. It seemed that there should be some method by which this type of change might be ac