Dental technician's tool and retainer combination adapted for the rapid and accurate positioning of a tooth model die repetitively on a model base support, the tool comprising an axially elongated member having an upwardly extended head portion engageable with the tooth model die, a downwardly tapered bottom portion and a downwardly diminishing intermediate portion of cusped transverse cross-section, the tool retainer comprising an apertured body having an internal wall defining a tapered bore of cusped transverse cross section adapted to cooperatively seat the elongated member against cocking and rotation, the body being adapted to repetitive insertion in and removal from the model base support, and anchor means on the body periphery adapted to block relative movement of the body and the model base support in projecting member seated relation against cocking or rotation of the tooth die in mounted position on the model base support.
A plug connection for fastening tooth or jaw segments to a pattern base is provided which consists of a pin and a matching sleeve which snugly receives the pin and from which the pin can be separated again by counter-pressure. The pin consists of a permanently lockable locking shank and of a detachable plug-in shank. The plug-in shank has two different coupling regions which, on the one hand, warrant precise fit of the plug-in shank in the matching sleeve and which, on the other hand, allow perfect uncoupling.
Tooth and jaw models comprise a base and removable tooth sections which are fastened removably by pins put into suitable holes in the base. After the production of the jaw replica positive a hole is drilled in each section of the positive and the upper parts of the pins are cemented into the holes. The positive, including the pins, is then put into a casting mold having a height equal to the length of the insertion parts of the pins. The casting mold is then filled with gypsum, so that after cutting the positive into section, the sections are non-rotatably but removably fastened in the base and can be separated easily at the visible ends of said insertion parts of the pins. The pins have a cylindrical upper part and a profiled insertion part having a cross-shaped, star-shaped or triangular section. The prongs of the insertion parts have edges arranged parallel to one another. The method and apparatus allow a simplified production of tooth models, maintaining the required precision and easy separation of the individual sections from the base.
A mounting and alignment device for removably mounting a dental model or portion thereof to a base cast. The device comprises an alignment collar which is adapted to be fixedly secured to a dowel pin and a dental model, the combination being receivable in a complimentary depression in a base cast to align and retain the dental model, preventing it from rotating or moving transversely with respect to the base cast when the portions are cooperatively engaged. A gasket may be included in the base cast to further enhance the engagement between the dowel pin and the base cast.
A model for acquiring three dimensional data of a portion of a dental arch to receive a prosthesis, the model comprising a casting mold of a dental arch (2) mounted on a base (5), the portion of the casting mold to receive a prosthesis being separate from a remaining portion of the casting mold and mounted so as to be moveable and repositionable precisely on the base using pegs, wherein a mold of each tooth or portion of teeth adjacent to an extremity of the portion of the casting mold to receive the prosthesis (3) is also separate (6, 8, 9) from the remaining portion of the casting mold as well as from the portion of the casting mold to receive the prosthesis, and is mounted so as to be moveable and repositionable precisely on the base of the casting mold using pegs.
A positioning stud for master models, formed by a cylindrical body, in which approximately one third of its length is threaded, this threaded area being separated from the rest which is smooth, by a circular boss, to limit the threaded area being inserted in the master model concerned. The free end of the stud is adequately shaped to fit the auxiliary tool used to place it in the model.
