US2311992A - System of dental prothesis - Google Patents

Description

Feb. 23, 1943. E. v. OLASAGA EI'AL SYSTEMS OF DENTAL PROTHBSIS giied Nqv. 7, 1940 -Y.----..---- a??? gv llhl l ll I (75 edifc br s Jag/7..

Patented Feb. 23, 1943 SYSTEM OF DENTAL PROTHESIS Eduardo Villasefior Olasaga and Jos Santiago Trejo Solis, Mexico City, Mexico Application November 7, 1940, Serial No. 364,720 In Mexico November 29, 1939 3 Claims.

The present invention, in general terms, is related to systems of dental prothesis and more particularly it refers to a system of artificial teeth, interchangeable, made of porcelain or of any other adequate material. This system offers great advantages over any thus far applied or known in the dental prothesis, not only due to the safeness and firmness which the artificial teeth acquire, but also on account of the completely natural aspect which they present.

Therefore, the main object of the present in vention is to improve considerably the aspect relative to the adherence of the artificial teeth to the backings which may or may not be integral parts of the teeth.

Another aim of the invention is to provide the means which admit the application of the present system of artificial and interchangeable teeth fastened to backings, in combination with the well-known systems of adherence to the root of the teeth with pegs, so that the invention also allows the adaptation of the interchangeable backing system to that of the adherence to the root of the teeth by means of pegs.

Another purpose is to provide a system of adherence of artificial teeth to backings which, in addition to being more solid and durable, present a completely natural aspect without the possibility of any part of the metal of the backings being seen, not even when the mouth is opened. Thus, not only the firm attachment of the artificial tooth has been considered but also its natural and aesthetic appearance.

The above and some other advantages, purposes and characteristics of the invention will become apparent in the following description and drawings which as illustrations are included herewith. The same reference numbers in the drawing being used to indicate the same parts appearing in the different figures shown.

In the drawing:

Fig. 1 represents a lateral view of a tooth built in accordance with the present invention, backing to which the tooth is fastened being shown by the dotted lines.

Fig. 2 is a profile viewed from above of the backing which holds the artificial tooth tightly.

Fig. 3 illustrates a front elevation of the backing shown in Fig. 2.

Fig. 4 represents a transverse cut as indicated by the line EF of Fig. 1.

Fig. 5 shows the profile of an artificial tooth provided with its corresponding backing as per this invention. This backing is adapted to be fastened to the root of the natural tooth by a peg as is customary in the art of dentistry. The backing is indicated by dotted lines and the root by a vertical cut.

Fig. 6 is also a profile of the artificial tooth adjusted to its corresponding peg, a vertical out being shown of the backing and indicating with dotted lines the outline of the artificial tooth and the root of the natural tooth.

The improved bi-partite artificial tooth includes a tooth proper or facing and a backing, to which the facing is secured, to present a solid durable interlocking relation, with a completely natural aspect, while the backing in assembled relation is completely concealed.

The backing, indicated generally at 15, is an integral body of metal or other appropriate material. The front face of the backing-that face next the tooth properis formed with a vertically-ranging projection IS, the side edges of which are undercut at ll, see Figure 4. The upper end of the projection I6 is extended forwardly and increased in width to form what may be termed a locking head 11, the forward face of which curves downwardly and rearwardly. The lower edge of the head I! is adjacent its juncture with the projection Hi upwardly cut away transversely or recessed, as at. Il thus providing a depending lug-like appendix I8 of the full width of the head I! and spaced from the projection IS. The lower end of the projection I6 is slightly rounded, as at 24, Figure 6, and the side edges of the backing from which the projection I6 extends are outwardly and rearwardly rounded or undercut, as at i5 on opposite sides of such projection, thus forming a relatively narrow neck connecting the projection IS with the body of the backing, as clearly shown in Figure 4.

The facing or tooth proper, indicated gener ally at H], is formed on its rear or backingengaging face, with a recess w to receive the projection Hi, the edges of the recess extending inwardly to accurately fit in the reduced neck portion [5 of the backing to interlock the parts, as at 20, Figure 4. This, it will be apparent, insures an accurate interlocking between the tooth proper and backing to prevent any relative forward, rearward or lateral movement. Forwardly of the recess Ill at the upper end and communicating therewith, is a channel 30, shaped to accurately receive in a close fit the locking head I! of the backing I5. The lower end of channel 30 is formed to provide a depression 3| to accurately receive and fit the appendix I8 of the backing. The lower end of the recess Ill in the tooth facing I0 is shaped to form an accurate seat for the rounded end 24 of the backing projection I6. The rear face of the tooth facing I0 is rounded rearwardly and outwardly as at 3| to accurately fit the complementary surface of the backing, as more particularlyshown in Figure 4.

The facing 10 is fitted to the backing l5 from beneath, and when properly cemented in place, the various parts interfit, as clearly shown in Figures 1 and 2. It will be noted that the interfitting is such that the tooth facing is interlocked against relative upward movement, which of course is the direction of stress in the use of the tooth, and furthermore, the facing H1 is so interfitted with the backing l5, that no part of the latter is visible from the front of the tooth. The upper surface 22 of the backing is concave and the upper surface 24 of the facing is coincidentally concave, shaped to adapt itself perfectly to the alveolus of the user.

The backing 15 here described has been formed substantially so as to present a socket forming an independent unit from the bridge support, thereby making it possible the adaptability of teeth held with pegs 25 and fastened to the natural root 26 of the tooth, that has been removed. Thus, to this end, the said. peg is 25 screwed by means of its thread to 21 the backing I5 as illustrated in Figs. 5 and 6 of the attached drawing.

Thus far, I have described and illustrated the preferential manner of carrying this invention into practice, but I wish to state here that it is not my desire to limit my rights of invention to the illustrations and descriptions made here about it, but, due to the different changes and variations which may arise when carrying this invention into actual effect, my rights must be considered within the reach of the stipulations mentioned in the following chapter regarding claims.

Having thus described the invention, what We consider as new and desire to secure by Letters Patent is:

1. A bi-partite tooth structure, including a backing and a tooth facing, the backing having a vertical projection enlarged at the upper end forwardly and laterally to provide a locking head, the lower end of the head having a depending appendix in advance of and spaced from 'said projection, the tooth facing being formed with a complementary recess in its rear face to accurately receive and fit the locking head, ap-

pendix, and projection of the backing, the recess of the facing opening through the upper end of such facing to permit the facing and backing to be assembled by relatively direct upward movement of the facing, saidformation limiting such relative upward movement to a predetermined relation ofthe backing and facing. V

2. A construction as defined i-n'cl'aim 1, wherein the side edges of the projection on the backing areundercut, and wherein the complementary recess in the facing is formed to inter-fit with such undercut edges of the backing.

3. A construction as defined in claim 1, wherein the locking head of the backing is, when the facing and backing are assembled, in substantially vertical alignment with the biting edge of the facing to afford maximum resistance in the use of the tooth.

EDUARDO VILLASEFIOR OLASAGA.

JOSE? SANTIAGO TREJO SOLIS.

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