Page 35 - My FlipBook

MECHANICAL FIXATION
19
middle with a fine fret-saw, and sliding a fine ribbon-
saw (Fig.
4) through with long strokes.
Try after
every stroke whether the saw be really in the middle
of the pin.
Before inserting the
appliance, press the forked
tips together with pliers, in order that they may more
easily pass through the holes without being put out of
shape by the cement.
Apply the rubber dam, insert the appliance covered
with a thin bed of cement, spread the forked tips of

Ficx. 1.5.
the pins with a fine enamel
chisel, and press them
firmly to the tooth by means of riveting-pliers.
(Fig. 15).

To protect the lips from being hurt by the visible
tips, make previously a small cross groove on either
side of the holes, by means of either a diamond or
fane carborundum disc (see Plate I.).
The use of the burr No. i (Fig. 3) may also be ad-
vised
; by means of this burr the anterior part of the
hole IS given a conical form.
Into this groove force
the split gold-wire tips, and trim with sandpaper discs
Bemove the cement between the tips, and substitute
silicate cement.