Dentistry – Apparatus – Having gauge or guide
Patent
1980-08-29
1982-12-14
Mancene, Gene
Dentistry
Apparatus
Having gauge or guide
A61C 1900
Patent
active
043636250
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention has to do with improvements in the tools available to dental technicians as they go about their daily work of creating artificial teeth, crowns and bridges for use in dental restorations. More particularly, the invention has to do with improvements in the pin or dowel tools available to the dental technician to hold tooth dies in precise position for crafting restorative appliances. The invention further relates to retainer devices for such pin or dowel tools, and to novel methods of forming casting cavities by the "lost wax" method using the tool and tool retainers of the invention.
BACKGROUND ART
In the formation of dental restorations, the dentist, prepares the tooth by removing diseased portions, and any other portions needed to mount a replacement surface on the treated tooth. In the case of teeth subjected to root canal treatment, the nerves are removed from the tooth portions deep below the gum line. In other, e.g. crown work, a gold or like material cover is used and is fitted onto the tooth with great precision for reasons of comfort, appearance and disease control. For example, the dentist cuts a "margin" to which the crown is seated exactly. The dental technician receives from the dentist a negative or "impression" of the tooth surface to be restored, and of the adjoining teeth as well. In the dental lab a positive of the tooth area, is prepared using the negative impression as a mold to make a "model". Certain of the teeth for which crowns are to be made for example are required as well. Others have proposed use of two dowel pins on a common base, which blocks rotation but is deficient in cocking resistance in other than the transverse direction. Also the great size of such pin arrangements prohibits their use where very small teeth are involved.
DESCRIPTION OF THE INVENTION
It is accordingly an object of the present invention to provide an improved dental technicians's tool, particularly for the locating of tooth dies in place on a model base support, and further to provide a separately formed retainer for the tool which will not wear loose in use, and which can be color coded, unlike metal dowels, for matching tooth dies to tool retainers remaining on the base support. It is a further object to provide a system for rapidly and securely mounting tooth dies to a base support with self-wedging action downwardly and circularly of the tool and retainer assembly. It is another object to provide novel structures useful as tool and tool retainers and as aids in the generation of crown posts and casting reservoirs, respectively, as well. A still further object is to provide devices formed in plastic for lower cost, color coding, and ease of slip-fit in assembly.
These and other objects of the invention to become apparent hereinafter are realized by the provision, in accordance with the invention, of a dental technician's tool 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 said tooth model die, a downwardly tapered bottom portion receivable in the base support, and a downwardly diminishing intermediate portion of cusped transverse cross-section arranged to engage the base support above the member bottom against cocking or rotation of the tooth die in mounted position on the model base support, but in repetitively vertically separable relation. Preferably, the member head portion is generally cylindrical about the member axis and rises from a transverse shoulder formed on the member; the bottom portion is coaxial with the head portion and tapered at a first angle relative to the member axis; the intermediate portion is frusto-conically tapered downwardly from the transverse shoulder at a second larger angle relative to the member axis and vertically defines a plurality of circumferentially spaced surface rounded splines disposed at a third still larger angle relative to the member axis for spline differen
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Mancene Gene
Wilson John J.
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