Page 28 - My FlipBook

12 THE TIGHTENING OF LOOSE TEETH

Thus there are at last six pins, parallel, directed
into the mouth (Fig. 5).
In case a canine is much rotated, so that parallel
drilling would weaken it unduly, it should be drilled
across independently of its direction, and must be
retained separately.
The first step in applying the retainer : The
parallel drilling being difficult, the impression made

Fig. 5.
In practice the pins must be turned round.
at the first sitting should be used as a model for
parallel drilling (Fig. G).
In case drilling is painful—in spite of the above-
mentioned remedies—injection or ethyl chloride may
be resorted to.
After having removed the pins, I take an impression
with Perfection composition, on which the holes are
marked (Fig. 7).