Impression pressures against teeth in a partially edentulous model with a mobile tooth: influence of impression tray design

The purpose of the present study was to examine the effect of custom tray d esigns on local pressures against teeth during the impression procedure. In a previous study, a partially edentulous simulation model with a mobile to oth was used, and the effect of custom tray designs on the displacement of the mobile tooth was examined during the impression procedure. Based on tha t study's results, we have assumed that the differences in impression press ures between the labial and the lingual sides of a mobile tooth could eithe r cause or affect displacement. The present study was undertaken to determi ne the local impression pressures against each side of three anterior teeth , including one mobile tooth, using the same simulation model and the same custom trays as in the previous study. It was found that the local pressure s exerted against teeth during the impression procedure were affected by th e custom tray designs and varied according to the coronal shape, axis Incli nation and location of the teeth.