US1183540A - Rugæ-mold for denture-plates. - Google Patents

Description

G. A. CRITCHERSON.

HUGE MOLD FOR DENTURE PLATES.

APPLlCATlON FILED JAN.2.1915.

1 ,1 83,540, Patented May 16, 1916.

THE COLUMBIA PMNDUMPH C0.. WASHINGTON, D. c..

UNITED STATES PATENT cur os. I

GEORGE ALBERT ORITCI-IERSON, 0]? LOS ANGELES, CALIFORNIA, ASSIGNOR TO THE COLUMBUS DENTAL MANUFACTURING CO., OF COLUMBUS, OHIO, A CORPORATION.

HUGE-MOLD FOR DENTURE-PLATES.

Application filed January 2, 1915.

To all whom it may concern Be it known that I, GEORGE A. CRITCI-IER soN, a citizen of the United States of America, residing at Los Angeles, in the county of Los Angeles and State of California, have invented certain new and useful Improvements in Rugae-Molds for Denture- Plates, of which the following is a specification.

This invention is an improvement on the rugae mold disclosed in my application originally filed November 22, 1913, Serial No. 802,452 and now claimed in divisional application filed May 1, 1914:, Serial No. 835,669.

Heretofore in the manufacture of denture plates they have been molded with an upper surface to fit the rugae or undulations of the roof of the mouth, but with a smooth surface for the under or lingual surface of the plate, or artificial roof of the month, which results in imperfect articulation and in imperfect management of food in mastication, because when the under surface, or lingual side, of the plate is smooth the tongue has but little power to hold or manipulate a morsel of food upon it.

As in the rugae mold heretofore invented by me the mold forming the subject matter of this invention is formed with a natural rugae, but no claim is herein made for this parse as that feature is claimed in my former application.

The object of my present invention is to provide a rugae mold of metal in proper form and of a thickness sufficient to hold the corrugations or undulations constituting the rugae mold, while the outer marginal edge portion of the metal of the mold is much thinner than the portion in which the rugae is formed, whereby said marginal portion more readily lends itself to the work of burnishing and adjusting to the entire surface of the plate and between the teeth so that no polishing or burnishing of the denture plate will have to be done after the rugae molds have been removed from the vulcanized plate.

In the drawings: Figure l is a plan view of the lingual side of a denture plate with my improved rugae mold burnished in posi- Specification of Letters Patent.

Patented May 16, 1916.

Serial No. 451.

tion thereon. Fig. 2 is a plan View of the lingual side of the rugae mold detached. Fig. 3 is a plan View of the lingual side of a rugae mold as it is furnished to the trade. Fig. 4 is a vertical sectional view on the line H of Fig. 3.

The reference numeral 5 designates a denture plate and 6 teeth secured thereto. The rugae mold 7 is composed of metal, or any other suitable material, the middle portion of which is much thicker than the marginal portion 8. In other words the mold is made of different thickness in difierent portions of its area. The middle or interior portion of metal in which a natural rugae is formed must be of suflicient thickness to maintain the formation given it in forming therein the corrugations or undulations constituting the rugae, while the marginal portions of the metal should be relatively thinner than the middle portion, so as to lend itself to the work of burnishing and adjusting the rugae to the "entire surface of the plate, and burnishing and adjusting the marginal portions between the teeth as shown in Fig. 1. When the mold has been thus burnished and adjusted on a plate, it is not necessary to polish or finish the plate after the mold has been removed. The relatively thin marginal portion of the mold enables me to readily burnish it up to and between the teeth whereby it may be adapted to the individual case.

In using this invention the dentist waxes up as usual, and has the base plate of the same thickness on palatal portion of the base plate as the desired thickness in the finished plate. Just before fiasking place a rugac mold upon the base plate in correct relation to the teeth, not forcing it into the base plate, but with a comparatively soft implement press around the edges gently pressing the mold in place. After the plate has been fiasked and vulcanized and the mold removed from the plate it will be found that it will not be necessary to polish the plate. When the rugae mold has been removed it will have the configuration shown in Fig. 2, the pointed portions 9 having extended between the teeth, while the tongues 10 at the rear have been fitted around the back of the last tooth of the plate.

What I claim is:

A rug-0e mold comprising a relatively thick In testimony whereof I affix my signature 111 presence of tWo Witnesses.

GEORGE ALBERT GRITOIIERSON.

middle portion having the formation of a WVitnesses: natural i'ugee, and a relatlvely thin marginal C. P. SHEEHY, portlon. R. B. TREAT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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