Clarke courier. [volume] (Berryville, Va.) 1869-1997, 1907-10-16

mat-;V is Sunk by Vibration In Semi
huid Ashestus and the ;sio;S When
Set Filled With Porcelain.
This was an upper front tooth that
had once been nicely filed with gold.
but fresh decay having set I'm around
that filing It had become necessary to
ill the tooth again. This time. the
dentist said. he thought he would ill
IL with porcelain
All the processes OF making por-
ceiain inlay are interesting. Having
drilled the cavity In the tooth to its
required depth and shape. the dentist
next proceeds TO make matrix or
mold OF It I'm gold foil, which he is
enabled 20 DO without breaking this
delicate material By the use OF a bit
OF sponge between Il and the crowd
ing tool So he crowds the gold foil
down around within It everywhere to
fit into the cavity perfectly and gets
the depth eli around the edge OF
the mold So exactly that the inlay to
be made I'm &c when set into place viii
not only fit perfectly ia the cavity, but
1T Into Il with It's edges flush all
around with the surrounding surface
OF the tooth
The mold thus made OF the cavity IN
the tooth may look ike the tiniest Of
tiny gold caps or IL may have some
Irregular shape. according 10 the shape
OF the cavity; but. whatever It's shape,
this mold Of gold foil IS 50 slight and
thin that q touch would crush It. and
II seems indeed as If n breath would
blow It away. rs probably It would.
and vOu may wonder how n solid
piece % porcelain can ever be formed
In mold SO frail and delicate. but IL
Is al really very simple. as you will
see
Now the dentist takes n small me-
talic holder about the size and shape
Of e very small clam shell, which he
his with powdered asbestus mixed
with water. ami on top Of this Yield
Ing material. handling It gently with
palr or pliers. he sets the delicate
little gold mold. with its closed end
down. resting SO on the surface OF
the moistenel powdered asbestus.
THIS holder has q Up on one side OF
1 It's clgc. hy which 81 can be lifted with
pair of pliers made fo- the purpose
! and serving thus as a handle for It,
Lifting the little saucer now by this
\ handle. the operator rubs on the han
4 dc very gcnjv. as one might draw n
4 fiddle bow very gently back and forth
\ on the strings 90 r fiddle. 4 lead PEN
/ ell might 90 for this. hut he Is likely
/ 10 use some professional tool with a
I chased or cngra vcd handle whose r.
T ...sas
/ and. rubbing gently with this on the
/ handle OF the holder. he communicates
I 20 II and 20 It's contents and TO the lit.
/ tie gold mold on top continuous. gentle
/ vibrations. which. slight rs they are
+ still cause the mold gradually to settle
/ and imhcl itself IN the semiauid mass
fl the holder. and this without in the
I slightest changing its shape. These
/ vibrations are continued I'll the mold
/ has settled 10 the required depth. and
/ then the water Is evaporated from the
/ asbestus, ana there you have the little
/ gold mold dvuly imbcddcd IN practi.
/ cally s0ill material and ready for use
The inlay viii be made IN the mold
/ from porcelain powder. Porcelain
/ powders for dental use are made 10y
/ the manufacturers Of dental supplies
/ IN endless variety OF shades. 50 that
it is easily possible TO get 4 powder
/ whose finished product VIII match any
/ tooth. The dentist has Il great as.
/ sortmcnt OF teeth made from porcelain
| powders. these all named or numbered
and he matches up your tooth with
/ one Of these and uses FOR the inlay the
/ powder Of the corresponding mum Der.
With the little gold mold all ready
/ the operator ROW mixes sufficient
/ quantity Of the porcelain powder with
alcohol 20 give him the material in q
/ plastic form. while nj the same time
tie alcohol VIII evaporate quickly. lie
/ vets also the asbestus IN the moll
holder 10 keep that from absorbing the
/ alcohol 81 the porcelain powder
And now witA his porcelain IN work
able form he fills the mold with il. T.
make There the shape thar Is to he set
into the tooth. and then he proceeds to
fashion In the plastic material It's out
ward part This may lie simply q
slightly rounded surface. for an inlay
that Is 10 80 into the Gatter part Of q
| tooth. or the inlay may include az
edge or corner OF a tooth. or both: but
whatever TIE outward part may be
| the operator SO moldS and fashions II
that it VIII continue and complete nat
uraNy the contour Of the tooth n
which the inlay Is 10 be set
With the modelling thus finished. III,
inlay IS ready for the final process. and
now. with the holder mold and all
1t Is put into a tiny electric oven, out
OF which after suitable time It Is
taken, baked into i solid bit OF porce
Ian. the inlay completed.
II IS set in place with cement. and
so perfectly is porcelain inlaying now
done that except upon the closest in
spection Ii I-oy 1e Impossible 10 tell IL
an inl0id tccth where the natural tootl
ends ANA whore the inlay begins. 9
nice operation in modera dentistry
| Washing,ou Post.