US1435909A - Lingual bar - Google Patents

Description

MLF. ARATA.

LINGUAL BAR.

APPLICATION FILED ocr.12, 1921.

Patented Nov. 211, N22,

PLl-7 7E5 OR PART/ 9L DENT/711E615 ATTORNEY Patented Nov. Ell,

( ap -1 a. new t3 ii A. an hi IIIARIO F. ARATA, OF SAN ANSELJHO, CALIFORNIA.

LING-HAL BAR.

Application filed October 12, 1921.

T 0 all whom it may concern:

Be it known that I, l lanio Amara, a citizen of the United States, residing at San Anselmo, in the county of Marin and State of California, have invented new and useful Improvements in Lingual of which the following is a specification.

This invention relates to a lingual bar, and especially to such bars as are used in partial dentures.

The object of the present invention is to generally improve and simplify bars of the character described; to provide a bar which may be employed in any shape mouth, whether the gums are low ridged, high ridged, or formed with deep lingual walls; a bar which will minimize space and may be bent to meet varying conditions without fear of fracture, and above all a bar which will give a maximum of anchorage, reinforcement and retention.

Further objects will hereinafter appear.

The invention consists of the parts and the construction, combination and arrangement of parts as hereinafter more fully described and claimed, having reference to the accompanying drawings in which- Fig. 1 is a perspective view of the lingual bar. Fig. 2 is a plan view showing the position of the lingual bar with relation to the partial dentures and the permanent teeth.

Fig'. 3 is a cross section of a partial denture illustrating a flat or low ridged mouth.

Fig. i is a similar section illustrating high ridged mouth.

Fig. 5 is a cross section. illustrating a mouth with deep lingual walls.

Referring to the drawings in detail, and particularly to Figs. 1 and 2, A indicates the lingual bar forming the subject matter of the present invention. The bar may be constructed of solid gold or any other suit able material, and its cross section may be elliptical, circular, etc. The bar is shaped to conform to the shape of the human aw and the ends are preferably flattened as at 2, and perforated as at 8, to form an anchorage with relation to the vulcanite in which they are embedded.

Lingual bars are provided for the purpose of forming a connection between partial dentures, such as illustrated at 4: and 5. These dentures are usually located one on each side of the jaw and as they are subj ected to considerable pressure in varying direc- Serial No. 5073M.

pressure and strains to which the partialplates or dentures are subjected, a pair lateral projections, such as indicated at 6, have been provided. These are also flattened and perforated, as indicated, and are formed as an integral part of the bar proper. The present bar is so constructed that the ends, together with the lateral projections, may be completely embedded in the vulcanite or hard rubber, of which the partial plates or dentures are formed. This is important as partial exposure of the metal parts is not desirable. The lateral projections 6 permit of a maximum amount of retention, thus eliminating the possibility of the bar working loose in the finished vulcanite partial denture. The perforations formed in the bar are also of importance as they further increase the retaining feature which tends to render the bar more secure in the vulcanite. The lateral projections may be bent to meet any condition which may be present without fear of fracturing the same; for instance where a flat or low ridged gum or mouth is encountered, as illustrated in Fig. 3, it is only necessary to partially flatten the projections. Again if the mouth is high ridged, as illustrated in Fig. 4:, it becomes possible to curve or round the same. While, if the mouth or gums are provided with deep lingual walls, it is obvious that the bend in the bar and in the projections may be further increased.

From the foregoing it can be seen that the bar is constructed to meet the strain that the partial plate or denture is subjected to during the side-bite, incisingbite, and open and shut-bite, which occur in the process of mastication. This is due to the fact that the form of the bar, the perforations there in, and the projecting extensions 6, render it impossible for the bar to work loose in the vulcanite. The bar is furtherfore constructed to consume as little space as pos sible, thus allowing for the maximum of vulcanite, which naturally increases the life, strength and durability of the denture; for instance in cases where the lingual flange is thin it is still possible to permit the bar to be sufliciently covered with vulcanite without forming a bulky denture. Again, in cases where the lingual flange is of medium depth, the bar can be placed so that there will be sufiicientvulcanite below the bar to prevent exposure thus further increasing the strength of the plate. Another advantage is obtained by directing the lateral extensions crosswise of the vulcanite denture from lingual to buckle thus again increasing the rigidity of the denture, and strengthening the tie or bond between the bar and the denture.

While the drawings illustrate a single pro jection on each end of the bar, it is obvious that one or more may be formed if desired,

' similarly that other changes in the construction, combination and arrangement of parts may be made by those skilled in the art without departing from the spirit of the invention as claimed.

The bar may also be employed in conjunction with partial upper plates and as such would be termed a palatile bar.

Having thus described my invention, what I claim and desire to secure by Letters Patent is l. A device of the character described comprising a substantially U-shaped bar, and a lateral outwardly extending projection formed adjacent each end of the bar, said projections and the ends of the bar be ing flattened and the ends of the bar extending beyond the said lateral projections.

2, A device of the character described comprising a substantially U-shaped bar, a lateral outwardly extending projection formed adjacent each end of the bar, said projections and the ends of the bar being flattened, and perforations formed in the ends of the bar and said projections.

MARIO F. ARATA.

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