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lO MECHANICAL DENTISTRY AND METALLURGY.

Full Upper Impression, Position of Patient, etc.—After
tlie plaster has l:)een prepared and mixed as directed, fill
the tray about level full, not more unless the palate or arch
is unusually high, in which case place a little more over the
wax at this point. Stand at the right side of the chair,
and direct the patient to sit erect; then pass the left hand
around the patient's head and with the index finger distend
the lips. Bring the right heel of the tray into the mouth,
then allow the side at about the cuspid angle to press
slightly against the right side of the mouth, when the left
heel may be readily passed over the finger. Now take
suflicient time to place the cups in proper position, carefully
pressing the rear in place, afterward bring it up firmly in
front. This will force any excess of plaster forward.
Now, by having the first two fingers of each hand support
the cup under the center of the alveolar ridge, the pressure
will be equally distributed, and the thumbs will be free to
press the lip in and up, so as to force the plaster well up
over the alveolar ridge.
If there is retching (tendency to vomit), incline the
patient's head a little further forward and direct him to
resist the tendency, to keep the tongue and throat quiet, and
breathe entirely through the nose, which act keeps the
mouth and throat quiet, and therefore less liable to irritation
from the impression material and accumulation of saliva
in the mouth.
If the line of wax has been placed across the heel of the
impression cup, and the directions carried out, further treat-
ment need seldom be resorted to. There are rare instances,
however,—some cases of cleft palate, for example,—where
the soft palate is so extremely sensitive that it will not per-
mit sufficient contact without some local or constitutional
treatment.*
* As a constitutional remedy, bromid of potassium is probably the