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4 THE TIGHTENING 0¥ LOOSE TEETH

covered ; caps, collars, and crowns ought not to extend
to the gingival margins.
In case commencing atrophy of the gums is present,
gold collars will accelerate this process, and the
margins of the supporting collars will be uncovered
after a short time.
Topical treatment of the gums and permanent
control of calcareous deposits at the gingival margins
cannot be performed if a ring extend below the gum.
Should a collar be too large, so as to fit loosely, it

Fig. 1.

may be rendered tight by means of a gold wedge pushed
in underneath it.
Elongated molars with denuded and sensitive necks
should be protected by pure gold collars (Fig. 1).
For securing the immobility of the retained teeth
within the collars, caps and collars should be adjusted
with pivots and screws.
The following may serve as a cardinal rule :
When supporting loose teeth that ought to remain