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CONNECTION OF RETAINING APPLIANCES 47

wax, invest it palatally up to the incisive edge, and
cast in Melotte. Swage the back of phitinum plate,
drill through it and through the hole of the natural
tooth, pass a platinum pin through, tack it firmly in
the mouth, and solder both pin and cap with pure
gold (Fig. 31).
After placing goldfoil below the cap on the plaster
model as for every porcelain corner, the corner is fired
according to the model ; insert the whole, split the
pin, and bend the ends apart.

Fig. 31.

The use of a rivet-head is advised also in fastening
a bridge, and in case a weak canine serves as an
abutment.
The canine is drilled, and a post of this kind or a
rivet-head applied to secure firmer anchorage of the
retaining-cap.
In all cases where caps ought to reach onlj' to the
enamel neck, it may be good practice to allow them to
extend beyond the incisive edges, the cap thus securing
a firm hold, even if the tooth is not drilled.