The ridge height, clearance between the ridge and the occlusal plane, and various inclinations, were significantly selected as independent variables where the dependent variable was the displacement PC under a bilateral load. The effects of the morphological PCs were evaluated by means of stepwise multiple regression analysis with displacement PC as a dependent variable. The denture movement under bilateral and unilateral loads was analyzed using a finite element (FE) model constructed from the digitized shape, following PC analysis of the displacement of representative points on the denture (displacement PC). Principal component (PC) analysis was performed using the coordinates of the points on the grid as the variables (morphological PC). The determined shapes of the ridges were uniformly divided circumferentially and radially. The shapes of casts and waxed complete dentures were digitized. The aim of this study was to determine the importance of each morphological factor of edentulous alveolar ridges according to its influence on the movement of complete dentures.
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