US3921293A

US3921293A - Dental prosthesis

Info

Publication number: US3921293A
Application number: US498708A
Authority: US
Inventors: Avedis Keumurdji
Original assignee: Individual
Current assignee: Individual
Priority date: 1974-08-19
Filing date: 1974-08-19
Publication date: 1975-11-25
Anticipated expiration: 1992-11-25

Abstract

Dental prosthesis having acrylic base with gum recess, having a resilient molding engaging the gum, and a mounting element joining the base to the molding.

Description

United States Patent Keumurdji Nov. 25, 1975 [5 DENTAL PROSTHESIS 3,226,826 1/1966 Town 32/2 [76] Inventor: Avedis Keumurdji, Tucuman St., N.

Buenos Alres, Argentina Primary Examiner-Robert Peshock 22 i 9 974 Attorney, Agent, or FirmNorman S. Biodgett; Gerry A. Blodgett [21] App]. No.: 498,708

[52] US. Cl. 32/2 57 ABSTRACT [51] Int. Cl. A61C 13/00 1 [58] Field of Search 32/2, DIG. 2 Dental prosthesis having acrylic base with gum recess, having a resilient molding engagingthe gum, and a [56] References C'ted mounting element joining the base to the molding.

UNITED STATES PATENTS 2,934,823 5/1960 Preis 32/2 10 Claims, 6 Drawing Figures US. Patent Nov. 25, 1975 I FIG. 2

FIG.

m u I 0 I I I I I ll w DENTAL PROSTHESIS BACKGROUND OF THE INVENTION It is well known to make false teeth of acrylics shaped in accordance with a mold taken from the gum of the person for which it is made. The plastic structure is, therefore, a gum negative of that persons mouth. Although logically the prosthesis should be perfect, nevertheless, in practice some movement takes place during mastication, so that they become not only uncomfortable because of the looseness, but the natural teeth that should support the device can be loosened. Research and testing has caused dentists to reach the conclusion that the acrylics, although an ideal material for a denture, is too rigid to adapt itself to the gum. These and other difficulties experienced with the prior art devices have been obviated in the novel manner by the present invention.

It is, therefore, an outstanding object of the invention to provide a dental prosthesis to supplement the prosthesis concavity with some neutral material, which is able to match the possible differences in some places of the artificial base, but the material is so adherent to the base that no movement relative to the gum is possible.

Another object of this invention is the provision of a dental prosthesis having an elastic molding of quartermoon cross-section, having the ability of being anchored to an acrylic base, so that the supplement acts as an integral part of the artificial structure.

A further object of the present invention is the provision of a dental prosthesis such that, after being placed in the mouth, the user can masticate properly without displacement of any kind, no matter what kind of food ,is eaten, since the denture matches the maxills dynamics, as it does with natural teeth.

With these and other objects in view, as will be apparent to those skilled in the art, the invention resides in the combination of parts set forth in the specification and covered by the claims appended hereto.

SUMMARY OF THE INVENTION In general, the invention consists of a dental prosthesis having an elastic molding of quarter-moon crosssection adhering to an acrylic'base through a mounting element which is locked into the same bases concavity; more specifically, to apply the mounting element, it is required only to make a shallow rabbet in which it locks.

BRIEF DESCRIPTION OF THE DRAWINGS The character of the invention, however, may be best understood by reference to one of its structural forms,

,taken on the line IV-IV of FIG. 3,

FIG. 5 is a section view of the prosthesis, and

FIG. 6 is an enlarged sectional view of the prosthesis taken on the line VI-VI of FIG. 5, but with the elements moved somewhat.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the drawings, it can be seen that the base a is molded of an acrylic polymer to support the teeth 1 and has an anatomic recess a, matching the gum shape. The base a is supplemented by a molding b, formed of polyester foam and coated with a layer 2 of fabric. The molding is essentially neutral and elastic, as well as capable of being easily flattened.

-The molding b is of qu arter-moon or concave-convex cross-sectional shape, in order to match the recess a at its exterior surface and to match the gum of the user through the interior or concave surface. The molding b is disposed directly in the recess a and in this way the false teeth are mounted on the gum as required.

The molding b is so elastic and neutral that it has practically no thickness, since it flattens readily, but its elastic tension acts by fitting the irregular surfaces. Nevertheless, some relative displacement can result during chewing. For that reason, the device includes the mounting elements 0, made as a laminated plate 3 .having on one active surface a harsh bristle 4 capable of adhering to the fabric 2 that coats the molding b. This adherence through a multiple of bristled filaments is so strong that, when the elastic molding b is applied against the mounting elements 0, it remains perfectly anchored as an integral part of the apparatus. For that reason, when applying the molding to the base a of the false teeth, it is necessary first to put the mountingelement c in the said base.

Since the prosthesis was molded in accordance with the shape of the natural gum and the addition of additional thicknesses would not be practical, rabbets 5, matching the areas of the mounting element c, are formed in the bottom surface of the recess a, as shown in FIGS. 5 and 6. These are locked in place without any protrusion, so that only the bristled filaments of the active surface 4 emerge. In this way, the mounting element c located in its respective rabbet 5 of the recess a will be sufficient to lock the molding b in this recess, since the anchorage becomes bi-dimensional.

By applying the prosthesis in the manner described, the molding b is flattened between the surface of the recess a and the gum in such a way that it practically appears as a stamped sheet, but, being so stressed by the elastic tensions, a perfect fitting joint is obtained, immobilizing the denture perfectly and acting naturally.

In summary, this dental prosthesis comprises an elastic molding b which is capable of being flattened, which is of quarter-moon cross-section and which matches anatomically with the recess a of the prosthesis. The molding is coated with the fabric 2 and the said molding b has, as an anchorage means, one or more mounting elements c, made as a laminar platelet 3 that can be inserted in the rabbet 5 of the bottom recess a and presents its active surface 4 formed with bristled harsh filaments for adherence with the molding b.

It is obvious that minor changes may be made in the form and construction of the invention without departing from the material spirit thereof. It is not, however, desired to confine the invention to the exact form herein shown and described, but it is desired to include all such as properly come within the scope claimed.

The invention having been thus described, what is claimed as new and desired to secure by Letters Patent 1. Dental prosthesis, comprising:

a. a base formed of rigid material carrying artificial teeth and having a cavity having the general conformation of the gum of the user,

b. a molding of concavo-convex cross-section formed of resilient material adapted to fit between the said cavity and the gum of the user, and

c. a mounting element fastened to the base and having an adhering surface engaging the molding, the mounting element consisting of a lamination of fabric layers, the layers contacting the molding having coarse fibres extending from it to lock into the surface of the molding.

2. Dental prosthesis as recited in claim 1, wherein the molding has its convex surface coated with a layer of fabric that locks favorably with the mounting element.

3. Dental prosthesis as recited in claim 1, wherein the material of which the base is formed is an acrylic polymer.

4. Dental prosthesis as recited in claim 1, wherein the material of which the molding is made is polyester foam.

5. Dental prosthesis as recited in claim 1, wherein the mounting element fits tightly in a shallow recess formed in the surface of the said cavity of the base and has a rough surface contacting the molding.

6. Dental prosthesis as recited in claim 5, wherein the recess has undercut edges.

7. Dental prosthesis, comprising:

c. a mounting element fastened to the base and having an adhering surface engaging the molding, the mounting element fitting tightly in a shallow recess formed in the surface of the said cavity of the base and has a rough surface separable from but contactin g the molding.

8. Dental prosthesis as recited in claim 7, wherein the recess has undercut edges.

9. Dental prosthesis as recited in claim 7, wherein the material of which the base is formed is an acrylic polymer.

10. Dental prosthesis as recited in claim 7, wherein the material of which the molding is made is polyester foam.

Claims

1. Dental prosthesis, comprising: a. a base formed of rigid material carrying artificial teeth and having a cavity having the general conformation of the gum of the user, b. a molding of concavo-convex cross-section formed of resilient material adapted to fit between the said cavity and the gum of the user, and c. a mounting element fastened to the base and having an adhering surface engaging the molding, the mounting element consisting of a lamination of fabric layers, the layers contacting the molding having coarse fibres extending from it to lock into the surface of the molding.

7. Dental prosthesis, comprising: a. a base formed of rigid material carrying artificial teeth and having a cavity having the general conformation of the gum of the user, b. a molding of concavo-convex cross-section formed of resilient material adapted to fit between the said cavity and the gum of the user, and c. a mounting element fastened to the base and having an adhering surface engaging the molding, the mounting element fitting tightly in a shallow recess formed in the surface of the said cavity of the base and has a rough surface separable from but contacting the molding.