The curved plate is used to position and model a malleable material capable of temporarily supporting the incisor and pinless teeth according to positions and orientations that will then be fixed permanently in the prosthesis. The plate has a general U shape, delimited by two parabola-shaped contours: an outer edge and an inner edge, respectively corresponding to the contour of the vestibular walls of the incisor and pinless teeth of the prosthesis to be built. The plate features a flat surface on its lower face, and an appendix defining a visible reference point that must correspond to the position of the interincisive papilla. The distance between the reference point and an average central point of the outer edge indicating a position situated between the more vestibular walls of the upper central incisor teeth, is between 8 and 10 mm.