Page 489 - My FlipBook

485

The same principle
is perceived, but there is a difference,
which is sometimes very sensible, and this difference is owing
to the strength of the heat, and
its greater or less duration.
It would be very advantageous in a large city like Paris, if a
manufacturer of porcelain would establish a furnace specially
Then results would be
intended for the work of dentists.
obtained more satisfactory and certain, because the patterns
to be tried could be put in and taken out at pleasure, which
would indicate the moment it is necessary to stop the heat.
If incorruptible teeth should come to a degree of perfec-
tion, which leaves them nothing more to hope for, and their
usage becomes more general, some manufacturer of porce-
lain, will, without doubt, one day accomplish the suggestions
I give here.
Whatever be the formula for the clay, an essential condi-
tion to its good preparation, is in mixing intimately, and pul-
verizing perfectly, the substances which enter into its compo-
sition. In general, the beauty of the clay depends on the
manner in which it has been ground.
This is so true, that
when this operation is imperfect, the small particles of the
oxide form little spots on the exterior.
The colour of the paste ought always to be like that of the
enamel ;* the tooth must certainly be, in every part of it,
perfectly homogeneous
; it is for this reason that the same
colouring principles which enter into the clay, enter into the
enamel also.

* All the dentists who make incorruptible teeth, make their paste almost
white ; this i a ^reat mistake; the teeth being much better which contain
large proportions of the oxides.