US1342376A - Artificial tooth - Google Patents

Description

ARTIFIC|AL H.

Patented June 1, 19 20 SAMUEL mm, or WALLASEY, nnGLANn.

1 ARTIFICIAL TOOTH.

Specification of Letters Patent.

. Patented June 1, 1920.

Application at September 20, 1917. Serial No. 192,370.

To all whom it may concern:

Be it known that I SAMUEL EARP, a subject of the King of (irreat Britain, residing at Wallasey, in the county of Chester, in the Kingdom of England, have invented certain new and useful Improvements in or Belating to Artificial Teeth, of which the following is a specification.

This invention relates to improvements in artificial teeth intended to be used in combination with plates of vulcanite or the like and more particularly to what may be termed full contour all-porcelain tooth crowns.

According to the invention, the tooth has a hollow tapering outward from within the incisal edge to its base to receive the filling of vulcanite or the like in which is embedded a post secured to the tooth at the apex of the said hollow in the incisal edge or tip and extending the full depth of said tooth.

The post of suitable metal is secured to the porcelain tooth either by being fired in or soldered to a tube of platinum or the like preferably split, which has been previously 1 fired in the crown, or again the post may be fixed by means of Brills cement or other suitable known material capable of withstanding the conditions of the vulcanlzing process.

It is preferable to use a post flattened at the sides and this post may be of any usual form, splayed, headed, hooked or provided with projections to give a greater surface of engagement for the vulcanite.

The invention is more particularly described with reference to the accompanying drawings, in which Figure 1 is a side sectional elevation through the tooth,

Fig. 2 is a corresponding front sectional elevation,

Fig. 3 is a side sectional elevation of a modification,

Fig. 4 is a view of acapsule for assistingvin the securing of the post,

ig. 5 is an alternate form of capsule.

Fig. 6 is a sectional plan view of a narrow tooth,

Fig. 7 is a corresponding sectional elevation.

The porcelain tooth A has a hollow cavity tapering outward formed in it extending from its base right up toward the incisal edge in which is firmly anchored the post B to'be surrounded by a filling of vulcanite C which will consequently also be tapering in form. The post B may be tapered at its lower end or may be headed as shown, in which case it is usually desirable to arrange it at an angle so as to give as much room as possible under the tooth, which is particularly suitablewhere it is desired to insert a metal strengthener in the base plate.

A spiral groove or serrations E may be formed on the interior surface to provide a greater gripping surface for the vulcanite.

At the point where the post B is'fizged to the tooth A the vulcanite will become very thin and at this point of possible weakness a strengthener in the form of a metal capsule can be inserted. This capsule may be in the form of a narrow ring as shown in Fig. 4 or may extend the whole distance of the interior of the cavity as shown in Figs. 3 and 5. The capsule F mayi if desired, be provided with a spiral rib adapted to engage a corresponding groove on the interior surface of the porcelain.

The post B is provided with a number of projecting or abutment surfaces G to prevent the tooth from being pulled off the said post.

If desired, as shown in Figs. 6 and 7,.

the tooth A can be provided at its sides with g a thickening I over a triangular area, which will'still preserve the natural contour in appearance when the tooth is mounted. This arrangement is particularly suitable for narrow teeth such as lower central'incisors and upper lateral incisors.

To reduce the possibility of breakage under flask press power and due to the expansion of the rubber during vulcanizing,

relief passages D opening to the sides or base of the teeth may be provided. The conical form of cavity in itself forming, of course, the main means for relief.

One or more metal pins, tags or flanges of usual form can be arranged on the in-- terior surface of the porcelain for the purpose of holding the tooth more securely to the vulcanite.

I declare that what I claim is .1. As an article of manufacture, a full contour porcelain crown artificial tooth having a conical cavity extending from its base to its incisal edge, a post in said cavity secured directly to the tooth in its incisal edge, a conical metal sleeve at the integral junction of the post with the incisal edge 'Q emme of the tooth, and a filling of vulcanite of truncated conical internal and external form filling the remainder of said cavity.

2. As an article of manufacture, a full 5 contour porcelain crown artificial tooth, having -a conical cavity extending from its base to its incisal edge, a post insaid cavity secured directly to the tooth in its incisal edge, abutment flanges on said post facing 10 the tip of the tooth, and a filling of vulcanite of truncated conical internal and external form filling the remainder of said cavity.

In Witness whereof I have hereunto signed my name this 28th day of August, 1917 in the presence of two subscribing 15 Witnesses.

SAMUEL ARP, Witnesses:

ARTHUR ARMSTRONG, JOHN MCLAOHLAN.

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