Page 47 - My FlipBook

TUBE TEETH BRIDGE-WORK JJl

vertically into the tooth, for receiving a short post,
a deep cap is swaged of pure gold and 22-carat gold-
plate, a short post put in the hole, an impression-
taken, and the pin soldered to the cap: thus a perfect
bridge abutment may be obtained.
In the same manner canines or bicuspids should be
prepared. Drill a hole, and, after an impression is
taken, swage a lingual cap and solder at its lower
margin a thin wire for strengthening it. The lower
pure gold margin should be kept free and carefully
burnished in the mouth.
Caps of this kind also extend from the most promi-
nent to' the reduced part of the tooth. Thus, the fitting
of collars, caps, and crowns, may be secured without in-
juring the tooth. The tooth necks, on which, when fitted
with deeply extending collars or caps, caries develops,
remain free ; they can be cleansed by the patient, and
the dentist can inspect them and guard against the
frequent development of secondary caries. Irritation
by pressure on the gum does not take place.
In case a reduced tooth (commonly a canine) serves
as an abutment and has to be fitted with a collar,
being the sole support, grind a narrow groove round
the neck and fill with an inlay. The tooth presents a
form which will be thicker at the root ; the band made
over this fits at all parts, and cannot sink into
the gum.
For taking impressions of single abutments, use
the hollow glass-stopper of an Ash cement bottle, to
prevent the compound from moving away.