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US 4,059,902 AGranted
Tray for preparing a dentiform model used for an operation on a dental technic
AssigneeNone recorded
InventorYoichi Shiokawa
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AssigneeNone recorded
InventorYoichi Shiokawa
Estimating the term…
A tray for preparing a dental model which includes an arcuate channel formed in a body and simulating the curvature of a row of teeth. A wedge shaped notch is provided in the channel for assisting removal of a hard body cast in the channel, and the notch is adapted to be filled with a soft substance prior to filling of the channel with a material which will set to form the hard body.
A tray for preparing a dental model, the tray comprising a single, integral flat body, an arcuate channel formed in a flat surface of the body and simulating the curvature of a row of teeth, the channel having side walls which are outwardly tapered in the direction of said surface, substantially vertical grooves of arcuate cross section formed at regularly spaced intervals along the entire extent of each of the side walls, the arcuate channel also having a base and open ends and, formed in the base contiguous with each of the open ends of the channel, a respective wedge shaped notch for assisting removal by means of a driver blade of a hard body cast in the channel, the open ends of the channel being adapted to be closed by adhesive tape and the notches being adapted to be filled with a soft substance prior to the filling of the channel with a material which will set to form said hard body.
Dependencies are inferred from the claim text.
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Impression cups, i.e. impression trays; Impression methods: means or methods for correctly replacing a dental model, e.g. dowel pins; Dowel pin…
Dentistry
Term ended 29 Nov 1994 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The present invention relates to a tray for preparing a dentiform model used for an operation on a dental technic.
Heretofore, known systems have respectively been conventionally used as a method of preparing a dentiform model for its use in parts. However, such systems have many defects such as being complicated in the fixing and arranging of the parts and also the difficulty in arranging the same in a parallel manner, as well as the difficulty in fixing and arranging the parts when the impressions of inlays or post crowns have been obtained; and, further, incidences of shearing of the parts upon revolution thereof are apt to be increased when the such parts are is often fixed or removed throughout an operation.
According to the one known system, the retention power of the core portion of a tray is weak and thus a position of a dentiform model would be out of order.
FIG. 1 is a plan view of a tray.
FIG. 2 is a front view of a tray.
FIG. 3 is a perspective view of a tray.
According to the process of the present invention, a dentiform model having a supporting portion a may be prepared as set forth hereinunder in detail.
Utility wax is filled up into a wedged notch portion 4, and both opening ends of a core portion 1 are closed and covered by an adhesive tape. Isolating material is applied on the whole of an inner surface of a core portion 1 and a u-shape groove 3 and then the kneaded hard plaster is filled up thereinto. Thereafter, the base of a prearranged model of a row of teeth is planed by using a model trimmer and scored by a saw. After having been thoroughly moistened with water, the model is fixed on the hard plaster filled within a core portion 1 adjusting to a center line 5; and this is permitted to stand until the hard plaster has satisfactorily been hardened.
Thereafter, the adhesive tape on both opening ends is removed, and the supporting stand is easily removed by using a driver one after the other just as wrenching same open at an opening portion of said wedged notch portion 4. Thus, a model of a row of the teeth having a supporting stand may be obtained; and said model is used for an operation of a dental technic by cutting off the necessary tooth among a row of the teeth together with its supporting stand by using a saw.