Accuracy and comparative stability of three removable die systems.
A study was performed to evaluate three removable die systems: the Accu-Trac, the Pindex, and the conventional brass dowel pin technique. The stability of the dies in the mesiodistal, bucco-lingual, and gingivoocclusal directions was compared. Under the conditions of this investigation, the following conclusions were drawn. 1. No significant difference was found in the shift of the removable die in a horizontal direction between any of the three systems. 2. No significant difference was found in the displacement of the removable die in the vertical direction with the Pindex system and the conventional dowel pin techniques. The slight displacement that did occur was in an upward direction. 3. A significant vertical displacement of the removable die in a downward direction was found with the Accu-Trac system compared with the other two systems.