The Delaware ledger. (Newark, Del.) 1879-19??, 1884-11-01

uSclul ouDoIduSSo lOi phO AOos A1AsNNA
teeth"
The mechanical dentist must be a
genuine workman. When he Is about |
to make bone or ivory teeth he cuts
tusk into pieces and shapes each piece !
by an elaborate series of mechanical
processes. Sometimes for a customer |
who has plenty of dollars to spare he
will make a whole set, upper OF lower.
as the case may be, out of one piece.
He saws his block of ivory roughly to
the size, and then with infinite patience
lles and graves it into shape. He has
at hand model of the patients gum
and works to that model with exact
ness. Theteeth are not separate pieces;
they are cut into apparent rather than
real separation, like the teeth of a comb.
An artistic workman will take care
that the teeth shall present some of
that irregularity which our natural
grinders always exhibit; learner falls
into the mistake Of making them too
good. Many persons do not like to
wear dead peoples teeth-there is some
thing uncomfortable in the idea there
is also frequently a germ Of decay in
such teeth, and these two reasons led
to the custom of making artificial ivory
teeth. Ivory, however, with all its
excellencies, becomes discolored, and
hence the chief motive for making
teeth Of certain mineral or vegetable
compositions. There is, in fact, sort
Of triangular duel always going on
among the ivory dentists, mineral
dentists and vegetable dentists, each
class fighting stoutly against both of
the others.
Whether your dentist really makes
the teeth which he inserts In your
Uranium is a question he does not
deem 1t necessary to answer. In truth
he very rarely does anything of the
kind. There are certain dealers who
sell sets of teeth, half sets, twos or
sthrees, singles or doubles, front or back,
top or bottom, finished or unfinished
as well as all the apparatus and tools re-
quired for the dentists art. And some
Of these dealers themselves are supplied
by manufacturers who conduct opera
tions on considerable scale.
The United States is ahead Of all
other countries in this ART A recent
: computation makes the number of arti-
fetal teeth fabricated here as high as
, SIX millions annually-symbols accord
ing to some folks notions) of six mill
lion attacks of toothache. In one of
! the largest and most complete factories
: where mineral teeth are made, the chief
3 ingredients comprise feldspar, silica
aud clay; those Of subsidiary character
. are sundry metallic oxides, to produce
: those tints Of discoloratlon which are
necessary to make the imitation a good
d one. The feldspar, silica and clay are
, ground to an impalpable powder under
9 water, then dried and made into paste.
The teeth are cast in brass molds, var
i led in size and shape to suit the require,
i ments of the mouth. A special kind oi
; paste, to form the enamels, is first put
+ into the mold with small steel spatula
9 the platinum rivets, by which the teeth
n are to be fastened, are adjusted In posi-
g ton and then the paste forming the
A body of the tooth is introduced until
!. the mold is filed up. Next ensue pow
o erful pressure and drying, Wher
!. removing from the mold the tooth goe
d through process called biscuitin.
y analogous to a particular stage in por
;, celain manufacturer in which state 1
G can be cut like chalk. 1t is th en- sen
Il to the trimmer, who scrapes off al
T roughness and unnecessary projections
n and fills up any depressions which ma,
It have been left in the operation o
g moulding. A wash called enamel
! made by selecting various ingredient
d more fusible than those of the tooth
" grinding them to a fine powder wit
y water, and applying the thick liqui
L as paint by means of camel's hal
81 pencil, The tooth then goes to tn
y GUNNER, who applies gum compfisin
N oxide of gold and other ingredients
Is At length heat is applied. The tooth
5. when dried, is put into a mufle, G
a enameler's oven, where it is placed o
q layer of crushed quartz strewed owe
.e slab of FIRE resisting clay. Afte
ls being exposed for time to an intens
IL heat, the tooth is taken out and coole
u and there it is, beautiful forever.