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In order to investigate the influence of various impression procedures on the morphology of the partially edentulous mucosal tissue precisely, a new 3-D measurement system based on a binocular-temporal gradient method was devised. The greatest advantage of the system is that the amounts of substance and minute deformation of the object can be easily measured simultaneously. The accuracy of the system is 0.1mm and 10mm in the substance measurement and in the deformation measurement respectively. Three parameters selected for the impression procedure were the space between the inner surface of the tray and the mucosal tissue, the flow of impression material and the size of tray. It was found that the amount of displacement in the mucosal tissue was increased as the thickness of space on the tray was reduced or the viscosity of the impression material was increased in partially edentulous patients. Moreover, the large tray caused greater displacement around the margin than the small one.

Influence of Various Impression Procedures for Mandibular Distal Extension Removable Partial Denture on Displacement of Residual Ridge.