The sun. [volume] (New York [N.Y.]) 1833-1916, 1910-03-13

TsIllng Fros start 70 Flnash the stsry 90
q PsVat Teeth.

r.snns Frsn start 70 Flnash the stsry %
Pfvet Teeth.
This tooth, an upper front. had been
filed once. with a regulation gold hliing
malIeted i'm. Further decay bad Talsassd
that hIling and then the dsntist put m q
porcelain inlay. That stayed In few
montha. and then the dentist sAid that the
she'll wouldn't permit Of any further work
ing and Ne wouldn't fool with h any more;
be would Just cut 10 OF and put on pivot
tooth.
Preliminary 20 this he took out the
nerve. which in this case was dead. 20 Il
came out without pain; and then into the
vacant nerve canal he introduced soft
material saturated with an anttssptic
preparation. 20 purify the tooth. week
later he removed this end put into the
canal. to stay. a little spiro Of gutta
percha. which filed 10 completely
The root Of the tooth was firmly held in
the law, an Il was likely 60 remain for
years; and with that secure foundation 20
build upon the dentist proceeded with the
work Of making ready fog ard setting up
and anchOriag the superstructure. the
pivot tooth.
the decayed tooth and the body Of the
tooth down 20 the level OF the gum; and
then with a grinding tool called facer he
80 shaped the surface that il would best
support the pivot tooth when tha8 should
In grinding down the surface OF the root
OF a tooth such a. this. a front upper.
there " left a slight rising ridge extending
lengthwsse Of the jaw and With the wider
space from this ridge on the inner aide Of
the tooth. The base Of the pivot tooth 10
OF course ground correspondlngly; and
with that broader slope on the root and
the broader slope on the pivot tooth meet
ing there 10 made the strongest possible
joint to resist the strain imposed by the
pressure OF the under teeth against tbs
inner side Of the closing over upper. The
grinding Of thoss two little Inclined planes
down from the ridge ON the surface Of the
root il made easily possible by the U.S. Of
that simple but Ingenious littls tool the
faceF.
There il a dspression in the centre OF the
root. where the nerve came in. and pro-
iecting from the under side Of the facer,
which n a circular cutting tool operated
in tho same manner a. a drill. II q little
rounded point made to at into that cavity
when the tool " In use. and with Ia point
thus centred and securely held ths fAcsr
can bs opsrated freely without danger Of
sliding on against and cutting the adjacent
gum. and it can he inclined in any direction
90 cut the surface OF the tOOth In any
place or angie.
Thsn the dentist takes wax impression
q this section Of the upper jaw to get the
shape and size OF the tooth required; and
with the aid Of q sample rack OF artificial
teeth. 10 match by. hs selects a tooth by
color.
Artificial teeth. for their various uses.
are made in hundIeds q not thousands
OF variations, and among stock teeth
may bs found teeth "a MI q practically
endless variety OF requirements; and
yet as no two human teeth are exactly
alike it may be necessary To grind pivot
tooth a little To make IL fit perfectly and
make it, sides perfectly fiush With the con-
tiuuing sides Of the root 10 which it Is
attached.
While pivot teeth are usually of porce-
lain, they are sometimes made Of gold;
and for double or back teeth pivot teeth
are made with two anchoring prongs or
pivots instead OF one; but this IL a front
upper tooth Of porcelain that is now being
considered. This tooth has set in its
base. inbedded there when the tooth was
baked. a single prong or pivot OF pl9ti-
mum. made with little ridges around IL
in the metal 10 make it hold more firmly
and ~ that It cant pull out when IL has
been -rt in the cement In which Il In 20 he
placed In the cavity Of the root. And now
the dentist prOceeds hnally to set this
pivot tooth where 10 IN to 20.
Having ground the surface of the root
foundation to just the shape he wants IL.
he grinds the base % the pivot tooth to flt
there. and then with repeated fittings he
yrinds the pivot tooth 20 its final perfect
Shape 70 nc everywhere around and then
when the tooth has ben repolished it IL
ready 10 b. set in place.
In his work on the base the dentist has
slightly followed out the cavity To make
10 a little larger within than at its opening.
az " dohs. IA the case Of malleted filings
to help hold the filling in; the cement here
Ia be USED will when hard stick - that
u would have To he drillsst out. but shap-
ing the cavity 80 will help a little And
then all ready. the dentist fills the cavity
with "a plastic cement which he prepares
for us.. On the spot. and he PLACES more
of that cement on the pivot and on the
nss- OF the pivot tooth and then he settles
tine pivot into the bed 10 cement within
the base and gently presses the pivot
tooth down until il basc rests firmly and
truly upon the supporting base where
for a minute OF two he holds n; aud With
that the work upon the tooth N finished.
For an hour or two after that you don't
want to bite ON 10. but when Won get
We a Ia Il this pivot tooth ls good Tor
any use. and in appearance ~ So nat
ural that II you didn't happen 20 know
yourself which forth 10 was you couldn't
81 - = A.