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Fia. 378.

Fia. 377. The saw frame wilh the thread saw in position to make the first cut in trimming'
from the ffingival margin of the filling.
Fig. 378. The filled tooth, showing the
first saw cut (Figure 377) as having heen made and the
thread saw ui position for a second cut.
Fig. 379. The filled tooth, showing the second cut (Figure 37S) as having been made and the
thread saw in position tor a third cut.
Many other than these three principal saw cuts may often be
made to great advantage in triunning the gingival portion of fillings.