US1036561A - Dental process. - Google Patents

Description

F. A. CARTER.

DENTAL PROCESS.

APPLICATION FILED 111:0. so, 1910.

Patented Aug. 27, 1912.

W136 roe sass nNrT D STATES. PATENT OFFICE.

FRANCIS A. CARTER, OF CHICAGO, ILLINOIES.

DENTAL rRocEss.

Specification 'of Letters Patent.

Application filed December 30, 1910. Serial No. 600,101.

metal plates for supporting artificial teeth.

By my process artificial teeth are interchangeably secured to the cast metal plates in such a manner that, if for any reason one of the teeth becomes broken in use, it may readily be replaced by a similar tooth without remodeling in any way the metal plate or parts permanently carried thereby.

An essential feature of my process is the employment of an intermediate means between the tooth and the metal plate such.

that it may be engaged in the casting operation to be securely and permanently held in proper position upon the plate, while such means at the same time permits the proper and individual adjustment of the tooth during the process of making the plate, so that the teeth may be properly occluded. The intermediate means employed is of such a nature that it will removably support the teeth and may conveniently consist of individual backing plates for the several teeth; each backing plate being provided with projections adapted to be engaged and retained by the mounting plate during the casting operation, and conformed also to engage the teeth to hold them properly in position, so that they may be removed subsequently, if necessary, and new teeth applied. Obviously, other means may be employed than backing plates for accomplishing this result, as will be seen by reference to the accompanying drawings in which- Figure 1 is a perspective view of a model of the patients mouth and a wax pattern of the plate in place thereon, showing some of the'teeth mounted upon the pattern, while others of the teeth have been removed to show the mounting means. Figs. 2, 3 and 4 show side views of the teeth removed from the mounting means shown in Fig. 1. Fig. 5 is a transverse sectional view through the teeth shown in Fig. 1, to illustrate the relation between the teeth, their mounting them. Fig. 6 shows in sectional view, along the line 66 in Fig. 5, a portion of the mold made by means of the wax pattern shown in Fig. 1. Figs. 7 and 8 are enlarged transverse sectional views of two of the teeth Patented Aug. 27, 1912.

means, and the wax pattern supporting shown in Fig. 5, removed from their backing plates to more clearly show the construction employed. Fig. 9 shows in a view similar to Figs. 7 and 8 a modified form of backing plate. metal plate and tooth, in which a backing plate of the form shown in Fig. 9 is employed.

Fig. 10 is a sectional view through a 1 Similar numerals refer to similar parts throughout. the several views.

In carrying out my process a model 1 is first made, as is customary in the art, of the mouth of the patient for whom the plate is to be made. A thin sheet of beeswax 2' is applied to the model 1 and warmed and.

with the teeth of the other jaw. Melted beeswax is applied around the backing plates to build up the pattern 2 and securely hold the backing plates in position.

The backing plates may be of different conformation, as shown at 4 and 5, or the;

mounting means \may consist of pins as shown at 6. The construction of the backing plate 4 is shown more clearly in Fig. 7, from which it will be seen that slots 7 are made through such backing plate from its upper edge to receive the heads of the pins 8 extending from the lingual surface of the.

tooth 9. The backing plate 4 has extending from its lingual surface anchors 10, having enlarged heads to be surrounded by the wax forming the pattern 2, by "means of which the backing plate 4 is securely held in position.

The backing plate 5 is shown more clearly in Fig. 8 and is provided with two slots 11,.

preferably of dove-tailed conformation, extending through the upper edge of the plate, as'indlcated in.Fig. l, and adapted to receive the heads of the pins 12 extending from the lingual surface of the tooth 13.-

The backing plate 5 has secured to its lingual surface a second plate 14,-the edges of which are beveled asindicated, to afi'ord en-. gagement with the wax of the pattern 2 during the adjusting operation and ultimately a to afford engagement with the metal of the mounting plate, so that the backing plate 5 may be securely held in proper position u'poh such mounting plate. For some forms of teeth it may be desired to employ pins. as shown at 6 in Fig. 1 to support them instead of backin plates 4 and 5; and such pins are prefera ly provided with heads extending into and surrounded by the pattern 2, the projecting ends being adapted to enter suitable openings 15 formed therefor, as indicated in Fig. 5. A tooth 16 adapted to be used with a mounting pin 6 is shown in side view in Fig. ,3. I do not wish to secure claims in this case as to the mounting or backing plates as they form the subject mat ter of another application.

After the teeth and their mounting means are properly adjusted upon the pattern 2, it is to be understood that the wax of the pattern surrounds the anchors formed on the backs oft-he backingeplates or the heads of the pins in case they used; but that the wax does not engage the teeth in any way. The next step .in forming the metal plates is to remove the teeth without disturbing the mounting means and then the pattern 2 with the backing plates and mounting pins is placed in the flask 17, as shown in Fig. 6, and surrounded by investing material 18, in fluid condition, the customary sprue opening 19 being formed at the to of the flask. When the material 18 has ardened tho flask is heated sufliciently to cause the wax of the pattern to flow from the sprue opening 19, while the backing plates and mounting pins are held in roper position by the material 18.

terial l8 completely fills all of the openings in the backing plates to be engaged by the teeth and their supporting pins, and also completely surrounds the portions of the mounting pins to be surrounded ultimately by the teeth; and that the anchor portions of the backing plates and the heads of the mountin pins extend into the mold 20 as indicate Melted metal, as aluminum, silver, or gold, is then poured into the mold through the sprue opening in the manner usual in the art, and flows around the anchors formed on the backing plates and also around the heads of the mounting pins. When the plate thus cast has coo-led sufiiciently the flask is opened and the material 18 removed carefully, after which the metal corresponding to the sprue opening 19 is removed and the plate 1s trimmed and polished in the usual manner. The result is the counterpart of the pattern 2 with all of the teeth removed. Cement is then placed in the slots in the backing plates and in the openings 15 in the teethto be placed u on the mounting pins, and the teeth are t en placed in the position upon the cast plate For this condition, as shown m Fig. 6 it will be understood that the ma-' that they originally occupied upon the finished pattern, and the plate is complete.

As a result of the process described, it will be observed that the individual means employed to mount the teeth are securely held in place upon the. mounting plate with a portionof such mounting means; and that the mounting plate thus produced constitutes in connection with the individual mounting means a permanent rigid structure, affording for each teeth a support adapted to the particular requirements of such tooth regardless of the requirements of the other teeth. Inaddition to the flexibility of adjustment secured by my means for mounting the teeth directly upon the a cast metal plate, as the teeth are secured to the mounting means by cement, they may subsequently be readily removed if this becomes necessary through breakage, and other teeth may be readily mounted in their place without in any way changing the mounting plate or the mounting means.

In Fig. 9 a modified form of backing plate 21 is shown having an anchor 22 similar to the anchors 10, shown in Fig. 7, and provided on its front face with a projecting prong 23, conformed as indicated in Fig. 10 to enter an opening formed in the lingual face of the tooth, such opening extending also longitudinally of the tooth, as a result of which when the tooth 24 is secured upon the prong 23 by means of cement the tooth 24 is rigidly locked in position, so that there is no danger of it being pulled from the prong while the teeth are in use.

The mounting or backing plate is claimed in another copending application.

While I have shown the particular means herein described for carrying out my improved process, I do not wish to be understood as limiting myself to these means, for I may employ any equivalent devices that will suggest themselves to those skilled in the art without changing the essential steps involved in my invention.

' What I claim is:

1. The dental process consisting in making a model of'the mouth to be fitted, making upon such model a wax pattern'of the plate to be cast, supporting teeth upon such pattern by mounting means engaged by the pattern, adjusting the teeth and mounting means to the position required, removing the teeth from the mounting means, surrounding the pattern and mounting means with investing material, heating, the material to melt the pattern, pouring melted metal into the mold thus made, finishing the cast plate, and mounting the teeth upon their respective mounting means by means plate to'be cast, supporting teeth upon such pattern by mounting means engaged by the pattern, adjusting the teeth and mounting means to the position required, removing the teeth from the mounting means, surroundmg investing material, heating the material to melt the pattern, and introducing melted metal into the mold thus made.

3. The dental process consisting in making a pattern of the part to be cast carrying mounting means to receive and support artithe pattern and mounting means with ficial teeth, surrounding the pattern and mounting means With investing materlal, removing the pattern from the investing material, and introducing melted metal into the mold thus made.

In Witness whereof, I hereunto subscribe my name this 22nd day of December, A. D.,

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