Dentistry – Apparatus – Having static product shaping surface
Reexamination Certificate
2000-04-12
2001-03-27
Lucchesi, Nicholas D. (Department: 3732)
Dentistry
Apparatus
Having static product shaping surface
C433S041000
Reexamination Certificate
active
06206692
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to improved dental stock trays for taking an impression of a dentulous or edentulous mouth, particularly to the ones used for the following purposes: in general dental treatment, manufacturing a complete denture, a partial plate denture, a crown restoration or a treatment apparatus for a periodontal disease; in pediatric dentistry, manufacturing a complete denture, a partial plate denture or a crown restoration; in orthodontics, manufacturing an orthodontic appliance; manufacturing an apparatus for surgically treating a mouth including a temporomandibular joint; manufacturing a mouthpiece used in hard sports, such as boxing, karate, judo, soccer, football and baseball; during research in legal medicine or criminal investigation, collecting data or evidence thereof; manufacturing a mouthpiece used in eating or drinking and removed thereafter for deodorization or prevention of tooth decay; manufacturing a mouthpiece used in singing, playing a wind instrument or practicing pronunciation; or treating teeth of an animal.
Moreover, the present invention relates to improved stock trays used in taking an impression for fabricating an apparatus to be installed in a mouth of a subject when a maker of foods, drugs or spices develops a product such as vitamin compound, nutrient, drug, spice and sweetener. This apparatus comprises a chamber with a semipermeable fine mesh membrane made of plastic or metal. The chamber may be attached to the inner side of an artificial tooth or a plate of a denture, or to a hidden area in a mouthpiece. The chamber may be provided at an edge position of a plate in a denture or mouthpiece. When the denture or mouthpiece is inserted in a mouth, the edge position faces a maxillary tuberosity in the case of maxilla (thus a parotid gland for providing saliva is open near the position), or faces a sublingual caruncle in the case of mandible (thus a sublingual gland for providing saliva is open near the position). Previously, a predetermined amount of molten material such as vitamin compound, nutrient, drug, spice and sweetener is stored in the chamber. Osmotic pressure disperses the material into saliva with passing time. The effects in keeping and improving the subject's health may be investigated on the base of the pre-calculated amount to be ingested in a day.
In prior art dentistry, taking an impression is carried out twice in a process of manufacturing a denture: a preliminary impression of a mouth is taken with a “stock tray” to manufacture an “individual tray” first, and then a precise impression is taken with the individual tray to make a model of the mouth. The denture is manufactured by use of the model.
Historically such stock trays for taking preliminary rough impressions of mouths were devised about the middle of the
19
th century on the basis of dental knowledge in those days. The materials of the stock trays have been replaced with metal or plastic, but their shapes have been hardly improved up to now.
In many cases, the preliminary impression taken with a conventional stock tray becomes inaccurate at some key parts, which adversely affects substantially the precise impression taken with an individual tray. As a result, a denture not satisfactory to a dentist may be obtained thereby giving a patient a pain. Such situation may occur in the case of a complete denture or partial plate denture.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide improved stock trays capable of accurately taking an impression of a mouth including key parts, thereby enabling dentists to take directly a precise impression without an individual tray.
In order to achieve the object, according to the present invention, an improved maxillary dental stock tray for taking an impression of a dentulous or edentulous mouth comprises: a small through hole at the front and central position in a side wall of the tray, said position in the tray inserted in a mouth being in the neighborhood facing an incisive papilla or a median frenum; a projecting plate at the convex and central position in a base of the tray, said position in the tray inserted in the mouth being in the neighborhood facing a median palatine raphe or a palatine foveola; projections at the rear edge positions in the base of the tray, said positions in the tray inserted in the mouth being in the neighborhood facing a hamular notch; and protuberances at the rear end positions in an outer surface of the side wall of the tray, said positions in the tray inserted in the mouth being in the neighborhood facing a maxillary tuberosity.
Preferably, said projecting plate is disk-shaped, said projections are sectorial and said protuberances are semi-conical.
The projecting plate, the projections and the protuberances, however, may have any shapes as long as they have respective functions as described below. The plate and the projections may be, for example, elliptic plate-shaped, rectangular plate-shaped with round corners or trapezoid plate-shaped. The protuberances may be, for example, semi-sphere or rectangular solid with round corners.
According to the present invention, an improved mandibular dental stock tray for taking an impression of a dentulous or edentulous mouth comprises: projecting plates at the rear end positions in an inner surface of an inner wall of the tray, said positions in the tray inserted in a mouth being in the neighborhood facing a mylohyoid muscle line; projections at the rear edge positions in a base of the tray, said positions in the tray inserted in the mouth being in the neighborhood facing a retromolar pad; a small through hole at the front and central position in the inner wall of the tray, said position in the tray inserted in the mouth being in the neighborhood facing a lingual frenum or a sublingual caruncle; and a small through hole at the front and central position in an outer wall of the tray, said position in the tray inserted in the mouth being in the neighborhood facing lower front teeth or a median part.
Preferably, said projecting plates are disk-shaped and said projections are sectorial.
The projecting plates, the projections and the protuberances, however, may have any shapes as long as they have respective functions as described below. The projecting plates and the projections may be, for example, elliptic plate-shaped, rectangular plate-shaped with round corners or trapezoid plate-shaped.
REFERENCES:
patent: 2470679 (1949-05-01), Beers
patent: 3878610 (1975-04-01), Coscina
patent: 3978585 (1976-09-01), Holcomb
patent: 4227877 (1980-10-01), Tureaud et al.
patent: 5190457 (1993-03-01), Schreinemakers
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Hideko Komiyama
Lucchesi Nicholas D.
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