A New and Improved System of Artificial Dentures to Substitute Te and which isly known as Bridge Work.
Year: 1888

page_text: Date of Application, 4th July, 1888
Specification Accepted, 31st Aug., 1888
A New and Improved System of Artificial Dentures to Substitute the
Natural Teeth where a Portion of the Full Set is Missing and
which is technically known as Bridge Work.
I, ELEAZAR PARMLY BROWN Dental Surgeon Flushing Queens New York
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 :-
The object of my invention is to produce an artificial denture or bridge that will
combine a strength, a natural appearance and a cleanliness in the mouth never before
remotely approached with a simplicity of manufacture.
The novel and improved features of my invention are
1st. The baking of a metal bar preferably of platinum or platino-iridium invisibly
within and running through an artificial tooth or artificial teeth, and projecting at one
extremity or both extremities to the required length to be fastened to an adjoining
natural or artificial tooth or teeth by having one or both of the protruding ends of
the above described metal bar embedded in gold fillings in the approximate teeth, or
by having one or both of the said ends bent at right angles and extending through a
gold or porcelain crown and thence into the natural root which the gold or porcelain
crown would cover. In the case of the bar running into a porcelain crown the said
crown will constitute a portion of the bridge and be fused to the approximal tooth of
the Bridge as hereinafter described. In the case of the bar running into the gold
crown, the said bar will be admitted through a hole in the approximal side of said
crown and in no case is any soldering necessary with my improved Bridge Work.
And 2nd the fusing together of the approximal edges of the teeth composing the
Bridge each to each-during the baking where more than one tooth compose Bridge.
This is a great feature of strength making the Bridge one continuous piece of
porcelain. This afore described metal bar is baked through the ordinary artificial
tooth by grinding a groove or slot in said tooth, where the tooth is thick or deep
enough to permit, then placing the metal bar in this groove or slot filling the remaining
space with body or tooth material and baking as are all artificial teeth; or where the
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page_text: tooth is not deep or thick enough to permit of the groove or slot the metal bar is
attached by bending the pins (with which artificial teeth are usually supplied) about
and over said bar or by riveting said pins into holes made for the purpose in said
bar and covering the bar and pins in both cases with body and tooth material as desired
and baking as ordinary.
Among the advantages of my system of Artificial Dentures or Bridge Work
are:-
1st. Perfect truth to nature in appearance as when afore described metal bar is
baked invisibly through the artificial denture or Bridge which is fustaned by means of
said har to adjoining teeth, no metal is in view on the outside of arch of teeth or on
the inside of arch when the wearer throws his head back while laughing etc. as is
always in view in all systems of Bridge Work ever known before mine.
2nd. The absolute cleanliness, as when the afore described metal bar is baked
within the artificial denture nothing comes in contact with the secretions of the mouth
excepting the porcelain of the teeth and it is a fact that the said secretions will not
adhere to the glass surface of fused porcelain, where they will readily adhere to any
metal surface howsoever highly polished.
3. The great strength as the afore-described metal bar is baked within the artificial
denture and the forer of strain is equalized to all parts of the tooth or tooth which
will not break away as teeth will so often from the gold backings to which they are
soldered in all other systems of Bridge Work; moreover at the point where the said
metal lar enters the adjoining teeth composing the Bridge: when more than one tooth
are used the teeth themselves are united with each other to a certain extent by the
addition of a certain amount of body or tooth material between them and the fusion
of said adjoining surfaces during the taking. The last is a great feature of strength
never before made possible in any system of Bridge Work.
I am aware that the well known styles of gold porcelain Bridge Work have been
attached to the natural teeth and roots in various manners therefore I do not broadly
claim any special modes of attachment of my improved Bridge but simply claim the
simple and novel construction as herein described.
I am also aware that patents have been granted for certain so called "Self cleansing
Bridges" having a space between the said Bridges and the gums but as such spaces
really accumulate food impurities I do not construct my Bridge with such spaces but
I let the teeth composing said Bridges rest firmly on the ridge of the gum, and with
a porcelain Bridge this is cleanly in itself where it would be uncleanly with a metal
Bridge producing disease of the gums, as gold or other metals affords a surface on
which bacteria will propogate while the glassy nature of porcelain does not afford
such a surface.
I shall proceed to describe the accompanying drawing which forms part of these
specifications.
"
Fig. 1 is a lateral sectional view of a plate tooth with a groove or slot ground on
the posterior side ready to receive the metal bar the tooth pins "B are to be bent
over said bar to hold it firmly in the tooth while the body or tooth material is
applied, covering the bar and pins and giving the proper contour to the posterior
and during the baking.
Fig. is a posterior view of same tooth with the motal bar "A" fitted in a groove
or slot & the tooth pins "B" bent theroon to hold said bar firmly in position until
the body is applied and the tooth bakod.
Fig. 3 is a posterior sectional view of a plate tooth in which no groove or slot is
ground but the tooth pins "B" running into holes drilled in said bar and being
riveted in place hold said bar in position until the body is applied and the Bridge
baked.
Fig. 4 is a front sectional view of a completed Bridge attached to a natural footh
and root in the mouth. "A" is the motal bar embedded at one end in the gold
filling "B" seen in the natural tooth "C" and bont at right angles at the other end
the porcelain crown "G" and running thence into the nerve canal of the natural
root "K
in the form of a root pin. The porcelain teeth comprising the
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page_text: Bridge "D, E, F and G" are seen to be fused together each to each on their
approximal surfaces (as indicated by the letter "HI") in the process of baking.
Said porcelain teeth are also seen to press firmly and tightly on the gum for extra
support at the point indicated by letter "I."
Fig. 5 is a lateral view of a tooth of the completed Bridge the portion "X" beyond
the dotted line being the porcelain material addod before the baking to an ordinary
plate tooth bounded by the aforesaid dotted line and "A" is the end of metal bar
running as near as may be through the centre of the Bridgo.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what mannor the same is to be performed I declare that what I
claim is:
1st. An artificial Denture or Bridge composed of a porcelain tooth having a metal
bar baked invisibly through and projecting beyond one end or both ends or one side
or both sides to be attached to one or more of the natural teeth or roots in the manners
herein described and to rest firmly and closely on the gun, all as and for the purpose
set forth.
2nd. An Artificial Denture or Bridge composed of two or more porcelain teeth,
with a metal bar baked invisibly through and projecting beyond one end or both onds
or one side or both sides and having the approximal sides of said teeth, each to each,
united to some extent by the fusion of the porcelain to be attached to one or more
artificial or natural tooth or roots in the manners herein described and to rest firmly
and closely on the gums all as and for the purpose set forth.
10:1 T1000