A system for producing dental moldings from blanks, having a machine tool for machining a blank, and a workpiece holder for securing the blank during machining. The machine tool has in this case a mount for the workpiece holder, and the workpiece holder has a shank region that can be inserted reversibly into the mount and in the inserted state can be secured in position in the mount. Furthermore, the system has a lever element, wherein the system is configured so that the lever element can be clamped between the mount on one side and the shank region on the other side to secure the shank region in position in the mount. With such clamping of the lever element, a particularly high clamping force can be produced, by way of which the shank region of the workpiece holder can be secured in position in the mount.