An apparatus for simultaneously separating segments of a dental cast from a plaster base wherein the segments are mounted to the base with pins positioned within holes that extend through the base with the apparatus comprising a platform and a clamp for positioning the base in a predetermined position spaced from the platform. A set of engaging pins are positionable upon the platform in alignment for insertion into the holes of the base. A threaded driver is provided for moving the platform and engaging pins thereon toward a base located at the predetermined position to engage the engaging pins with the dental cast pins thereby dislodging the pins and separating the segments from the base.
The present invention provides for a device for use with denture models comprised of a supporting plate having upper and lower sides, and having at least one opening located on the upper side. An area for receiving retention pins is provided on the upper side of the supporting plate, the opening being located in the area for receiving the retention pins. At least one fitting head is provided where the fitting head is longer than the depth of the opening. A lift off plate is also provided having upper and lower sides and having a surface capable of contacting the fitting head. The lift off plate has a drilled hole, through which a screw is inserted upwardly from the bottom of the lift off plate, into a screw thread located on the under side of the supporting plate such that the supporting plate is held at a distance from the lift off plate that at least one of the fitting heads, rests on the upper side of the lift off plate so that a denture model, formed on the supporting plate, is removed by pressing the lift off plate upwards against the fitting head.
A dental model die ejector tool is designed to loosen the individual model dies mounted on a model base with a tapered dowel pin extending through the base, but at the same time not to lift them for any substantial distance. In turn, that loosening step allows for further easy separation of all the model dies with a wax cast as a single unit from the model base for further individual removal of the model dies. At one end, the model die ejector contains a pushing rod equipped with an ejector shank having a length of less than 1 mm and preferably about 0.1 mm for pushing the dowel pin upwardly in the corresponding sleeve for a short distance equal to the length of the shank so that the wax cast is not disturbed but the dowel pin is loosened. On the other end, the die ejector contains another pushing rod with an ejector cavity for loosening another commonly used type of a dowel pin extending from its sleeve after the removal of a protective cap. The depth of the cavity is sufficient to loosen the dowel pin while using the die ejector but not to lift it thus preventing any potential distortion of the wax cast.
Disclosed is a device for the removal of dental dowel pins that consists of a hollow boring bit for use with an otherwise conventional dental drill. The inside diameter of the hollow bit is of a size sufficient to accept a dental dowel pin of a conventional size, thus providing a means by which to bore around a dowel in order to remove it from the tooth structure in which it is implanted.
