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TUBE TEETH BRIDGE-WORK 29

Some years ago I used to perform an anchorage
of this kind, separate from the retaining appliance,
making a little " spider " between canine and bicuspid.
So I call the two pure gold caps over the canine and
bicuspid, strengthened with solder and with little
pieces of gold soldered on (see Plate I.).
Now I connect this "spider" firmly with the retain-
ing appliance, like the connecting of the retaining
appliances I have described above.
In case several teeth in a row are lost, the sub-
stituted teeth are again placed on the model, and
the retaining- wall made as if all the teeth were
present.
The pins for the substituted teeth must be kept free,
and on to these the tube teeth are to be cemented,
after the retaining ai^pliance has been inserted in the
mouth
Tube Teeth Bridge-Work.

There are three important advantages to which is
due the superiority of tube teeth bridges over all other
bridges for the fixation of loose teeth : They relieve
the strain on the abutments when properly fitted to
the jaw ; they are lighter and more elastic ; and by
means of their wires they form useful appliances for
retaining regulated and supported teeth.
Besides, their appearance is by far a more natural
one, and the operation of fitting or repairing requires
neither time nor labour. Because of their incon-
spicuous appearance, tube teeth are less noticeable in
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