Attachment to the Natural Roots of the Human Teeth.
Year: 1888

page_text: Date of Application, 27th Aug., 1888
Specification Accepted, 28th Sept., 1888
Attachment to the Natural Roots of the Human Teeth.
I, ELEAZER PARMLY BROWN Dentist Flushing, Queens New York U.S.A. do
hereby declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
My invention relates to artificial crowns to be attached to the natural roots of the
human tecth. One object of my invention is to produce an artificial porcelain crown
that will combine great strength with natural appearance and whose construction will
admit of easy application and simplicity of manufacture.
The primary novel features of the invention are first extending the porcelain body
or material of the artificial crown on to and around the metal pin or pins for the
purpose of giving extra strength at the point of greatest strain-and second the
improved form of the metal attaching pins which are baked into the artificial crowns.
To enable those skilled in the art to make use of my invention I will proceed to
describe the same in connection with the drawing, which drawing forms a part of this
Specification, and in which like features are indicated by like letters in reference to
the same views.
In the drawing fig. 1 illustrates a side elevation of a porcelain single-pin crown
designed for front teeth having but one root. Fig. 2 is a front elevation of the same
crown, and Fig. 3 is a side clevation of a double pin crown for teeth having two roots.
I am aware that metal pins have been heretofore baked in artificial teeth, but such
pins were unlike mine in form and did not possess the same strength as mine, nor the
same simplicity of application.
Referring to the drawing the letter "A" indicates the porcelain crown, and "B"
the metal pin or pins (of platinum or platino-iridium) which latter are baked in
position in the porcelain body or tooth material.
In Figs. 1 and 2 the pin "B" has a head "A" which is flattened in a lateral
direction corresponding somewhat to the form of the crown which head is an important
element of strength and it prevents the pins approaching the surface of the crown at
points where the latter is small and thin. The shank "" of the pin "B" is flattened

page_text: at right angles to the flat surface of the head A being thus broadened in a direction
from the front to the back of the crown, and this flattened surface of the shank is
broadest where it enters the porcelain crown or tooth material, and from that point it
tapers to its extremity as shown.
As indicated at "C" I show the porcelain body or tooth material extending on to
and around the pin below the base of the crown for about the 16th of an inch,
thus providing an important element of strength at this point, where the strain is
greatest.
"
In fig. 3 which shows a crown for teeth having two roots I employ two metal
pins "B." These pins may have flat tapering shanks "b" the same as the pins in
Figs. 1 and 2 and they may be joined at their tops "A as in the form of a staple, or
may be entirely separate from each other. These pins are baked in the porcelain
crown, and the tooth material is caused to extend on to and around the pins, below
the base of the crown for the purpose of increasing the strength and security at that
point in the same manner as in the constructions of Figs. 1 and 2.
Having thus described my invention what I claim as new and desire to secure by
letters patent is
Ist. An artificial crown of porcelain for attachment to the natural roots of the
human teeth combined with and having baked therein a pointed metal pin or pins,
substantially as set forth.
2nd. A porcelain crown combined with and having baked therein a metal pin or
pins and having the porcelain body or tooth material extending below the base of the
crown on to and around said pin or pins substantially as set forth.
3rd. A porcelain crown combined with and having baked therein a tapering metal
pin whose shank is broadened from the front to the back of the crown and is broadest
where it enters the tooth material of the crown substantially as set forth.
4th. A porcelain crown combined with and having baked therein a metal pin having
a flat shank and a head flattened at right angles to the surface of the shank substantially
as set forth.
5th. A porcelain crown combined with and having baked therein a metal pin with
a flat and pointed shank and a head flattened at right angles to the flat surface of the
shank. the body or tooth material of the porcelain crown below the base thereof
extending on to and around the shank of the pin, substantially as and for the purposes.
set forth.
3000.