Page 33 - My FlipBook

ri.ASTKR MODKLS OR CASTS. 21
that is, for full upper or lower, or l)otli. that the greatest
care is re([nire(l I'y the tcrui '" hilc," in relation to our
sul)ject, is meant the relative position of the jaws with the
articulation of the natural teeth, when there are any remain-
ing, with the length and contour of the lips.

Fig. 7.

For Full Cases.—Whether upper or lower, or both, a base
plate of some firm material, as paraffin 'w^ax or a thin sheet
of modeling compound, should be accurately fitted on the
model, and the edges trimmed to the plate line, that is, so
as to clear the facial or lingual muscles or aiiy heavy folds
of mucous membrane. If it is a low'er case, wdiether full
or partial (but giving greater assistance in partial cases),
a semicircle of stifl ware, No. 15 or 16 standard gauge,
should be imbedded in the base-plate to give it additional
strength for taking the bite and trying the teeth in the
mouth. Attach to this base-plate, by means of a hot spatula,
a rim of softened beeswax, sufficient to represent (as near
as yon can judge) a little more than the length and the
fullness of the teeth to be inserted. Place this trial plate
with rim in the mouth. Note where the wax rim is too
full or too long, or z'icc z'crsa ; then remove it, and trim or
build up as the case may require, until the proper length,
fullness, aiid contour are attained. As this wax is to be