US1970927A

US1970927A - Artificial tooth

Info

Publication number: US1970927A
Application number: US488297A
Authority: US
Inventors: Winthrop C Whittemore
Original assignee: Dentists Supply Company of New York
Current assignee: Dentists Supply Company of New York
Priority date: 1930-10-13
Filing date: 1930-10-13
Publication date: 1934-08-21
Anticipated expiration: 1951-08-21

Description

Aug. 21,1934. w. c. WHITTEMORE ARTIFICIAL TOOTH Original Filed Oct.- 13. 1930 In van /0 Win f/7 rap 6. W/r l'lfemore 4 Ho r-ney.

'30 though relying almost Patented Aug. 21, 1934 =11;-

Winthrop 1 f "N. Y., ass g Application I which the tooth is secured to the vulcanite plate,

with the result that the'tooth-when assembled in the denture is firmly held against displacement "or rotation.- H

In practice, it is only feasible to employftwo anchoring pins where there is sufficient width of the tooth to permit the attachment of the anchoring pins directly or through the porcelain body into which the pins are, so' l dered'. In those cases where the artificialftooth must be madenarrow or insmall siz es,"there isnot sufficient-width to permit the employment of two pins in the customary manner, and I have found that a single round pin, if relied upon for insuring a firm attachment to the plate, does not provide sufficient rigidity to prevent the rotary displacement of the tooth during the building up of the denture preliminary to final vulcanization or even after the completion of the making of the denture where heavy strain is put upon the tooth.

My invention has for its object the supplementing on an artificial tooth having a single anchoring pin with an additional means which upon becoming embedded in the vulcanite, acts to prevent loosening or displacement by rotation,

wholly upon the single anchoring pin for retention of the tooth to the plate.

A further object of my invention is to form the pin head and projecting shank. either or both,

of rectangular cross section so that the same will constitute a physical shape of a rectangular character which, when embedded in the vulcanite or other body material, will tend to retain the tooth to the denture plate and prevent rotation or looseness.

The additional means which becomes embedded in the vulcanite of the plate and constitutes a part of my improvement is, in its preferred form as a vertical rib extending rearward in a lingual 'direction and preferably at a distance to the side of the pin so as to leave a space between the said rib and the pin into which the vulcanite of the plate may extend.

My invention will be better understood by ref- 'erence to the accompanying drawing in which: Fig. 1 is a perspective view of a frontal tooth embodying my invention; Fig. 2 is an elevation of the same, presenting to view the rear or lingual surface thereof; Fig. 3 is a vertical section of an artificial tooth embodying my invention, taken mom nt-106mm I Whjttemote, ...Port ,Washington, V J D t ts s nmygc m i ki a in s-P ca i Nei rpm,

camber- 13, issojseriai nbliss s Renewed-Jungjq v1934 f fish-2 2] claims (or. (v

anchors embedded in on-1ine"3-- -3 of Fig; 2, and with the vulcanite plate-indicated dotted linesi and Fig; 4 is a transverse section Y of a tooth embodying my invention', taken on line 4-;4-or Fig; 2

2 is the body of the tooth," '3 is its incisal end; 7 15 the'upperor-cervicalend, and betweenthe,

said incisal endahd cervi'c'al end the rear or lingual 'pa'rt isprovided with a 'vertic alsurface l and a shelf or shoulder 5' located adjacent to the bott'om'of the said-surf 'a'c'e 41' "6- represents a single anchoring pin which isrctahgular in crosssec'-- tion' and shown'as provided with ahead of usual construction and having its inner end soldered to an anchor embedded-'inthe porcelainbody. Inaadditionto the ledge for shoulder 5, myimproved tooth is provided with a vertical rib "8- which extends in a lingual direction from the surface a and is preferably of less depth in a lingual direction than is the depth of the shoulder or shelf 5, though its depth may be changed more or less. The governing feature in the depth of the rib 8 lies in the fact that a sufficient space should be permitted between the said rib 8 and the pin 6 in which to receive the vulcanite which makes up the plate and in that manner insure a thorough embedding of the pin and the rib.

In Fig. 3, I have indicated in dotted lines at 10, the plate structure and its relation to the tooth, and it will be seen that this vulcanite plate encloses the cervical end of the tooth and completely embeds the pin 6 and

portions

4 and 8 of the tooth structure, and also extends inwardly under the pin and. over the shelf or shoulder 5, this latter construction insuring firm and n pronounced depression of the porcelain tooth during the incisal movements.

It will also be understood that while the shoulder or shelf 5 is not embedded within the vulcanite but forms a lower bounding portion for the same, the rib 8 does positively project into the vulcanite and, at the same time, is wholly covered thereby and consequently provides an anchoring means 'in the vulcanite which will prevent movement of the artificial toothabout its anchoring pin 6 as a center. By this means, the artificial tooth is not only thoroughly anchored to the vulcanite plate, but resists any strains which otherwise would cause the tooth to work more or less loose with respect to its attachment to the vulcanite plate.

It will readily be seen that the rib 8 intermediate of the ridge lap of the cervical end '7 and the bite at the incisal end 3 provides a vertical part, out of alinement with the pin, which will definitely engage the vulcanite plate material of, thelingual surface 4.

and engagement being in close cooperative relation with the horizontal shoulder or shelf 5 which sustains the thrust of the vulcanite plate, provides interlocking of the tooth body and vulcanite along angular lines, with the result that rotating displacement or loosening is impossible. 1 Furthermore, the lingually directed rib or

flange parts

8 and 5 provide a socket portion 9 to one side of the pin 6, which is adapted to receive the vulcanite plate material and there: interlock the tooth to the" by more effectually plate and prevent relative loosening of the tooth; upon the plate.

While the rib 8 operates to rotation of the tooth on the i p in the interlocking engagement therewith by the embedment of the head of the overlapping of the collar or neck portion by the vulcanite.

A single pin tooth with a rib for engagement within the plate body, asherein described, enables the tooth to be rnade very small, the size inv some cases being such that the anchor pinheadis relatively large respect to the area By making ithepin 6 of a-flattened construcins ures a more rigid connection with the vulcanite to prevent rotation. of

the tooth about pin than-where the pins-are HlidGgQi-Iillfil? in cross section, not only during the building up of the denture prior to vulcaniplate, the j mom is maintained thepmfi and also by zation, but also in the finished denture and moreover, even when applying the teeth to the plaster models while positioning them upon the preliminary wax plates of the models.

It will now be apparent that I have devised a novel and useful construction which embodies the features, of advantage enumerated as desirable, and whileI have in the present instance shown and described the preferred embodiment thereof which has been found in practice to give satisfactory and reliable results, it

is-to bemiderstood that I do not restrict myself to the details as the same are susceptible of modification in 'various particulars without departing from the spirit or scope of the invention.

Having thus described my invention, what I ,claimand desire to secure by Letters Patent is: v I; artificial porcelain tooth having the further the-rib constitutes a ledge which extendsto a greater distance from the lingual face yond' both rib portions. 7 1 .Wmnmor CQWHI'I'I'EMORE'.