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PATHOLOGY AXD MORBID ASATOMY. 513

No. 31 metal, gold or silver, which are cemented to the teeth (Fig.
478). ^yhen the teeth have suitable forms, a succession of rings sol-
dered together may be employed ; in other cases the teeth are lashed
together by means of fine gold Avire. For tem^jorary use No. 31 or 32
annealed brass wire may be used, and when left in situ for weeks or
months it exerts no deleterious effect. In fact, it appears to possess

Fio. 476.

Showing the m.anner of liolding an instrument for detaching calcareous deposits when using the
pushing motion. The third finger rests on the edges of the teeth, allowing freedom of the
hand to make rapid and effectual movements in dislodging the calculi.

antiseptic properties similar to those attributed to copper amalgam
when used as a filling material. Or, if frequently renewed, floss silk
may be used. Devices for this purjjose are as numerous as designs
for bridge work.
Each root is to be perfectly scaled before proceeding to a second
tooth. At the completion of the scaling the pockets are freely syringed
out with pyrozone 3 per cent., and an application of an a.stringent made:
a 10 per cent, solution of zinc chlorid, 20 per cent, solution of zinc
3.3