Antifoal Teeth Crowing and Means for Making the same.
Year: 1894

page_text: Date of Application, 16th Jan., 1894-Accepted, 24th Feb., 1394
Antifoal Teeth Crowing and Means for Making the same.
I, JAMES RALPH PHELPS, M.D., Dentist, residing at the South West Corner
of D and Third Streets, Marysville, County of Yuha, State of California, U.S.A.,
to 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 tooth crowns and consists in improvements in
the manufacture of said crowns, with a metal base band and backing, and in certain
details of construction which will be more fully explained by reference to the
accompanying drawings upon which :—
443
I, JAMES RALPH PHELPS, M.D., Dentist, residing at the South West Corner
of D and Third Streets, Marysville, County of Yuha, State of California, U.S.A.,
to 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 tooth crowns and consists in improvements in
the manufacture of said crowns, with a metal base band and backing, and in certain
details of construction which will be more fully explained by reference to the
accompanying drawings upon which :-
Figure 1 is a bottom perspective view of the attachment and incisor tooth.
Figure 2 shows the back and opening.
Figure 3 shows the post and opening from below.
Figure 4 is a vertical section.
Figure 5 shows the attachment on a molar.
Figure 6 is a vertical section thereof.
Figure 7 is a vertical section through the flask, the matrix, the tooth and dividing
plate, the sertional line being at right angles to the dividing plate.
Figure 8 shows the flask with one half of the matrix and the dividing plate in its
place.
The object of my invention is to provide an improved method of preparing
artificial tooth crowns with a metallic backing and base attachments thereto in
readiness to be fitted, and in such a manner that the teeth and the metallic attach-
ments may be kept in stock at all times, and ready for application with the minimum
amount of fitting.
By my invention I construct the backing, band and base, and secure them to the
porcelain or artificial tooth crown by the single operation of casting, leaving the
band of such form that it is easily fitted in any particular case to the root to which
it is to be applied by swaging or otherwise, and the operation of fitting such tooth
crowns is very easily effected. The band may be continuous or only partial its
object being to form an attachment and protection to the root.
The particular crown A which is to be fitted, is placed in a plaster-of-Paris,
metal or other suitable matrix previously formed which will secure the crown in
position and which will admit of the shape of the crown and the proposed backing,
base and band. The artificial tooth crown to be provided with these attachments
is fitted into that part of the cavity in the moulds prepared for it, and the metal is
then poured into the mould and flowing around that part prepared to form the back
base and band, fills the moulds and attaches itself firmly to the pins which project
from the back of the tooth crown, or in the undercuts in the crown, or by simply
adhering, thus forming the backing, base and band, in a single operation.
The post by which the tooth crown is secured to the root is placed in the mould
before the casting takes place, and the post is firmly secured when the molten
metal is poured into the mould. The bands which project downwardly are
adapted to partially or wholly surround the root to which the crown is to he
applied. In some cases it is desirable to form these backings with an opening
extending up through the top and rear portion behind the tooth crown or front, so
that when the crown is secured to the root by means of the cement filling, the
crown being pressed down the band fitting outside and around the root, any surplus
amount will pass up through this opening, thus allowing the crown to fit down to
Figure 0 is a vertical section thereol.
Figure 7 is a vertical section through the flask, the matrix, the tooth and dividing
plate, the sertional line being at right angles to the dividing plate.
Figure 8 shows the flask with one half of the matrix and the dividing plate in its
place.
The object of my invention is to provide an improved method of preparing
artificial tooth crowns with a metallic backing and base attachments thereto in
readiness to be fitted, and in such a manner that the teeth and the metallic attach-
ments may be kept in stock at all times, and ready for application with the minimum
amount of fitting.
By my invention I construct the backing, band and base, and secure them to the
porcelain or artificial tooth crown by the single operation of casting, leaving the
band of such form that it is easily fitted in any particular case to the root to which
it is to be applied by swaging or otherwise, and the operation of fitting such tooth
crowns is very easily effected. The band may be continuous or only partial its
object being to form an attachment and protection to the root.
The particular crown A which is to be fitted, is placed in a plaster-of-Paris,
metal or other suitable matrix previously formed which will secure the crown in
position and which will admit of the shape of the crown and the proposed backing,
base and band. The artificial tooth crown to be provided with these attachments
is fitted into that part of the cavity in the moulds prepared for it, and the metal is
then poured into the mould and flowing around that part prepared to form the back
base and band, fills the moulds and attaches itself firmly to the pins which project
from the back of the tooth crown, or in the undercuts in the crown, or by simply
adhering, thus forming the backing, base and band, in a single operation.
The post by which the tooth crown is secured to the root is placed in the mould
before the casting takes place, and the post is firmly secured when the molten
metal is poured into the mould. The bands which project downwardly are
adapted to partially or wholly surround the root to which the crown is to be
applied. In some cases it is desirable to form these backings with an opening
extending up through the top and rear portion behind the tooth crown or front, so
that when the crown is secured to the root by means of the cement filling, the
crown being pressed down the band fitting outside and around the root, any surplus
amount will pass up through this opening, thus allowing the crown to fit down to

page_text: its proper position upon the root, where it is secured when the cement filling bas
become set.
I also make in one piece the backing band and base, without attaching the crown
thereto either by casting or swaging, and with or without the post, in readiness for
the attachment of the tooth crown, either by amalgam, cement or soldering, so
that these parts may also be kept in stock, and in readiness to be put together for
any required use.
The construction above described enables a dentist to keep these intermediate
connecting metallic parts in stock in the same manner as the tooth crowns are kept,
and they are selected and fitted accurately to the root, and the desired form of tooth
crown is fitted and secured to the backing with but little time or labor.
Various forms of moulds or flasks may be used in carrying out my invention,
some of which are more convenient than others, but I do not desire to confine
myself to any particular one, but reserve the right to use any form which may be
found most convenient for the work in hand.
Figure 8 is a view of the flask having the jaws G with suitable handles H pivoted
together so that the jaws may be opened and closed conveniently and always meet
accurately. These jaws G are recessed and adapted to receive the material or
composition from which the mould or matrix is formed.
I is a bottom plate lying directly under the jaws G, and this plate is fastened to
the pivotal bolt of the jaws so that it remains stationary while the two jaws move
over the plate equally in opposite directions.
When closed the jaws G come together upon the median line of the bottom
plate I. In this bottom plate is made a hole for the insertion of core J.
In the simplest and most common operation of my mould, in the absence of
special patterns, I take an ordinary artificial toth or crown, matched as to location
and size to the tooth which is to be fitted. Orlinary dentists' wax is pressed upon
its base thereby making it the proper size and allowing an extension or shank of
the wax to extend downwardly whereby the tooth may be supported from the core
hole of the bottom plate I, and as said core hole is in the median line of the bottom
plate, the tooth itself will also be in this median line, one-half lying toward either
jaw. Over this tooth is then fitted a dividing plate K which is grooved to fit over
the tooth, and said plate is of sufficient dimensions to completely divide the recesses
between the two jaws G. The tooth which serves as a pattern and the dividing-
plate K being in place and the two jaws closed together, plaster-of-Faris or
other composition is then poured into the recesses of the jaws G in each side of the
dividing-plate K through a suitable opening at the top, and this material fills up
the recesses and forms a pattern.
In some cases it may be found desirable to simply fit the tooth to its proper place
in the dividing plate by embedding it in dentists' wax or otherwise supporting it at
the desired point, and fitting a suitable core at its lower end. The plate K is then
placed between the jaws G of the mould where it is held by closing the jaws, and
the material is then poured into the mould as before described.
When the material is sufficiently set, the jaws are opened, separating from each
side of the dividing plate K and carrying the now formed mould or matrix sections
with them, these readily dividing and separating at each side of the dividing plate.
These sections will form the matrix for the tooth to be cast. When the jaws Ġ are
thus opened the artificial tooth which serves as a pattern is removed and if it be
desired to cast or mould a metallic crown, it is only necessary to close the jaws again
and to pour the molten metal down into the sections through the hole in the top.
In case it is desired to make a hollow metallic crown, as usually will be the case,
I insert in the core hole in the bottom plate I, a core J which will form the hollow
in the cast or moulded part. When this cast or moulded tooth is removed, it may
be finished in any desired manner.
If it is desired to cast the base, band and backing to an artificial porcelain tooth
or to a metallic artificial tooth crown or tooth front, the artificial tooth is placed in
proper position in the mould, with a core of any suitable material having the desired

page_text: shape where the tooth is to connect. The anchor post or pin fits a hole in the end
of the core J and extends into the space to be filled with metal, so that it will be
united to the latter when cast. In many instances however it may not be necessary
to use the ordinary artificial tooth as a pattern, in place thereof I contemplate that
completely furnished dental offices shall be provided with any number of separate
patterns of different shapes as may be required.
Either of these patterns may be inserted in the core hole in the bottom plate I,
or suspended by the dividing-plate K, as before described and the composition
poured around it as before described. After this has set the jaws G are opened and
the pattern may be removed.
It will be manifest that the sides of the flask may be made in any desired shape.
They may be made to connect together with pins or other fastenings which will
also guide them so that they will always match in the same line without the use of
pivots or hinges. The bottom plate I may also be separate from the side plates of
the flask and connected to them by guide pins or grooved channels.
Any of the various forms of teeth, either separate or connected together in the
form of bridge work, may thus be cast and prepared for use.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. An artificial tooth crown consisting of a metallic base, band and backing cast
in one piece, and upon and around the tooth crown in a single operation.
2. In tooth crown attachments, a metallic base, band and backing cast in one
piece, said base having an integral post, substantially as and for the purposes
described.
3. An attachment for ordinary artificial tooth crowns consisting of a barking,
base and band, cast integrally in a single piece, substantially as described and
illustrated upon the accompanying drawings.
4. A device for casting metal teeth, or the base. band and backing to which an
ordinary artificial tooth is connected, consisting of a flask adapted to receive the
pattern, and a core and matrix substantially as described and illustrated upon
Figure 8 of accompanying drawings.
Dand thin Cinth day of Tour 1001