Vintage House Rotary Occlusal Grinder mounted on Dental Articulator. Condition is Used. The principle objective of the “Rotary Occlusal Grinder” was to provide a grinding or milling mechanism that may be applied to articulators to eliminate “locked” relations that commonly exists between articulated denture teeth. This grinding or milling device with a moveable cast holder and incisal pin was designed to be mounted in lieu of the upper member of the articulator. The milling de...vice was controlled by three eccentric gears which created an elliptical movement. The grinding procedure was intended to result in a horizontal freedom of movement of the dentures in various positions of occlusion. It also produced to a lesser extent, freedom in protrusion and retrusion. The “Rotary Occlusal Grinder” is powered by a suitable belt drive (usually a laboratory lathe) designed to be applied to the central pulley. Condition as seen in photos. The mechanism works.