Page 35 - My FlipBook

PLASTER MODELS OR CASTS. 23

the base plates and the wax rims are prepared as before
directed. Place the plates in the mouth, the lower first;
the proper length and contour should now be secured and
the occludino- surfaces trimmed, so that they will touch
evenly and at the same time upon both sides of the mouth,
and the patient directed to close lightly upon the wax in the
back part of the mouth. By this means, that is directing
Fig. 8.

the patient's attention to the posterior part of the mouth, it
at once overcomes the tendency to protrude the lower jaw
and give a false bite. The median Hne should then be
drawn across both plates and a cross, or two or three
oblique lines made on either side; after this is accomplished,
direct the patient to open and again close the mouth ; note
whether these lines are brought accurately together; if so,
have the patient bring slight pressure upon them by closing
the jaws a little harder, when, if the occluding surfaces
have been previously passed over the flame, they will adhere
so firmly that they may be readily removed from the mouth
together, without displacement. Fig. 9 shows them as
removed from the mouth.
The plaster casts should then be carefully adjusted to