Abstract: Disclosed herein are methods of farming orthodontic appliances without the use of a separating later between the orthodontic appliance and a dental model. Also disclosed herein are dental models having non-adhesive surfaces useful in the formation of orthodontic appliances, as well as curable compositions, kits and cured polymer products useful in the formation of the dental models.

Abstract: A vibratory apparatus for removing particulate materials from an object includes a container having a curved inner surface disposed about a generally horizontally extending longitudinal axis, the container being resiliently supported above a base. A plate is disposed in the container with a first edge spaced from the curved surface of the container and a second edge proximate to the curved surface of the container, the plate having openings therethrough. A vibration generator produces a vibratory force to cause the object and media within the container to be moved in a generally rising and falling path of rolling movement along the curved inner surface, the motion of the object being impeded by the plate while the motion of the media is not impeded by the plate, the media instead moving through the openings in the plate.

Abstract: A separator system may include a first trough having an inlet end, a downstream, outlet end and a trough floor, a first screen section supported in the trough spaced from the trough floor, the first screen section having a first end and a second downstream end, a material-retaining surface disposed at the downstream end of the first screen section, the material-retaining surface disposed at an angle relative to the first screen section to limit the movement of material across the first screen section, and a vibratory generator coupled to the trough. The separator system may alternatively or in addition include a gate disposed at the end of the screen section, the gate having a first position and a second position.