Abstract: A mold for the temporary retention of two or more false dental roots in a mass of plaster of paris or the like has a shell with a curved trough, of an outline conforming to that of all or part of the human jaw, which is of upwardly diverging trapezoidal cross-section and whose side and bottom surfaces are transversely corrugated for precisely locating any one-root segment of the molded mass temporarily removed from the mold. The trough is partly overlain by a retractable slider whose removal facilitates extraction of the mass. The bottom of the mold has a pair of longitudinally tapering, dovetail-shaped rails of a nonadhering material by which it is removably fitted into the plaster-of-paris layer of an articulator.