US907949A - Artificial tooth. - Google Patents

Description

E. H. BALLOU.

ARTIFICIAL TOO'IH. APPLICATION FILED AUG. 13, 1907.

907,949. Patented Dec. 29, 1908.

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' struction and combination of parts herein-' PATENT OFFICE.

UNITED STATES EMERY'H. BALLOU, OF DODGE CITY, KANSAS.

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Specification of Letters Patent.

Patented Dec. 29, 1908.

Application filed August 13, 1907. Serial No. 388,306.

and State of Kansas, have invented certain new and useful Improvements in Artificial Teeth; and I do hereby declare that the fol lowing is a full, clear, and exact description of the invention, such as will enable others to make and use the same, reference being had to the accompanying drawing, forming a part of this specification.

The invention relates to improvements in crowns for occlusion with the root of the natural tooth and-for bridge work upon artificial or natural teeth.

The invention consists in the novel conafter fully described and particularly pointed out in the claims.

Referring to the accompanying drawings: Figure 1 is a front view of a tooth embodying the invention. Fig. 2 is a'rear view of the tooth as seen in Fig. 1. Fig. 3 is a verti cal sectionalview taken upon the line a a' on Fig. 2. Fig. 4 is a front view of the tooth with the facing removed. Fig. 5 is a vertical sectional view of'Fig. 4, and Fig. 6 is a transverse view taken upon the line y,.'y, on Fig. 4.

ferentially, of the natural tooth. With the upper portion, 13, of the solid portion of the the same.

Fig. 7 's a detail rear view of one of the detachable facings, and Fig. 8 is a side View of Fig. 9 is'a transverse view taken upon the line 2, z, on'Fig. 7. Fig. 10 is an enlarged view; in perspective of the backing with the facing removed.

Similar numerals of reference indicate corresponding parts in all the figures of the drawlng.

The main bod of the artificial tooth consists of ametal- .acking, 12, the upper portion of the backing being o'lid and conforming to the individual proportions, circumbacking is connected a small pin, 14, which is inserted in the usual manner within the channelof the tooth-root, 15, as seen in Fig. 1,

forming an anchorage with the root and an occlusion with the orificesof the root.

backing extends downwardly a considerable The' lower and posterior portion of the 'distance' and is curved inwardly and terminates at a point in a vertical line with the vertical axis of the tooth as seen in Fig. 5, the sides 17 of the backing beingextended a distance forwardly of said vertical axial line,

' widt corresponding to the thickness of the back- 1 ing, 12. The anterior portion of the backing 12 is recessed or hollowed out, as at 18, and the surface inclined downwardly and inwardly and meeting the posterior portions of the backing at 19, at the vertical axial line of tlhe tooth, the metal at this point being quite t in.

extend inwardly thin metal flanges, 19, the lower ends of these flanges extending a short distance below a line horizontal with the lower end, 19, of the posterior of the backing, the vertical inner surfaces,-20, of the flanges being inclined downwardly and outwardly in a slight degree so as to form a wedge shaped opening between the surfaces of the flanges. A yielding plate, 21, extends a short distance downwardly between the up er ends of the flanges,.19, and is connected with the solid portion, 13, of the backing, this plate being se arate from the flanges, and a portion of W ich plate, 21, is bent at right anglesand extended outwardly to form a lip,,23.

' The-facing,.24, of the tooth is made from a solid body of porcelain. The face or labial surface, 25, is made of the proper'shape of the required denture; Upon the back or posterior portion of the facing is a wedge .shaped projection, 26, extending in the direction of the cervical margin and considerably narrower than the facing, and having slight under cuts or grooves, 27, upon the sides of the projection, this under out being of a sufficient to admit enou 11 metal "tobe of equal or greater strength t an the dovetail. The base of the projection, 26, which resembles an inverted of the incisal edge, 24 of the tooth facing, '24, this projection 26 being integral with the facing, and the grooved portions beingsuch as to receive the flan es 19 of the backing, 12, and to be held by said flanges with a wedgetion 26 terminates at a point a short distance downwardly from the cervical margin, 28, of the tooth facing 24, the surface of the back of the facing on each side and above the projection 26 being made flat and smooth. Above the upper end of the projection 26, and in the cervical margin of the tooth facing, is a transverse groove or depression, 30,in the porcelain body. The tooth facing, 24,

the projection 26 within the depression 24 of From the sides, 17, of the metal backing keystone, extendsdownwardlyv to and forms the lingualsurface like pressure. The upper end of the proje'cis secured to'the backing by the insertion of the backing, the lower ends of the flanges 19 being within the under cuts or moves, 27 of the facing. Pressure is rpp ied to the lin ual surface. and incisal edge of the facing and the facing is forced upwardly the cervical margin comes into contactwith the bent portion, 22, of plate 21, slightly depressing the plate and enters the depression 30 in the facing 24, and the facing is; secured in position without danger of accidentalrelease, cement being preferably employed to close all orifices. p

The backing may be made of gold, platinum or any other metal or combination of metals that will withstand the action of the secretions of the mouth. The facings, which are interchangeable, possess great strength, being one compact body of porcelain, their cutting 'edge being reinforced where the strain is greatest. If preferred, the inner surfaces of the flanges, 19, may be made substantially'parallel and also the grooves 27 in the projection 26 of the facings, the head 30 serving to retain the facing from removal from the backing.

The invention is applicable to brid e work upon the natural teeth and to meta plates and crown work, in which the facings may be of metal,preferably gold, for the retention of which the soft metal may be manipulated by the hammeror molded to fill the recess in the backing to form the facings, the backings being of a corresponding kindv of metal or such other as may e preferred.

aomee Having fully described my invention, what I new claim as new and desire to secure by Letters Patent is:

1. In artificial teeth, a backing having a recess in its anterior portion and a facing having a depression in the cervical margm thereof, a projection upon the osterior portion of the facing within sai recess, and sliding connecting devices connecting said facing with said backing and a spring fastener upon the backing which takes into the depression in the cervical margin of the facm 2. In artificial teeth, the combination with the backing having a recess in its anterior portion of a yielding plate within said recess connected with said backing, a facing and a depression upon its posterior portion adapted to receive said plate, and sliding connecting means connecting said facing with said backing.

3. In artificial teeth, the combination with a backing having inwardly extended flanges and a porcelain facing having a grooved projection upon its posterior portion adapted to receive said flanges, a yielding lip on the said backing, said posterior portion of the facing having a depression adapted to receive said lip.

EMERY n. BALLou.

W'itnesses:

O. H. SIMPSON, W. E. TEARE.

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