Page 50 - My FlipBook

46 OPERATIVE DENTISTRY
cotton or spunk held in the pliers, and again using the chip blower
to remove dust.
White Enamel Margins indicate the presence of loosened enamel
rods. If the SAveeping does not remove this, the margins should be
again chiseled, using a keen-edged instrument and a light hand,
then again be swept with cotton.
If the whitened margin still persists, it should be brushed over
Avith an extra fine cuttle-fish disk or strip when the loosened rods
will be carried away. The margin should be planed again Avith
the chisel.
Care in the Use of Disk or Strip. It should be fully understood
that Avhen a disk or strip is used for this purpose, the grit mus't
be so fine that there is no considerable cutting done, as there is
danger of changing the relation of the bevel to the enamel cleav-
age.
All Fluids Should be Used Previous to Cavity Toilet. The habit
of SAvabbing out cavities with alcohol or other substances after cav-
ity toilet is useless, and may do harm by introducing substances
Avith the liquid not easily remoA^ed.
Disinfection and Pulp Protection should have consideration fol-
loAving the removal of remaining decay and as a preliminary step
in toilet of the caA'ity.
If a fixed oil, or an essential oil A\hich may contain impurities
has been used, free SAvabbing and scrubbing of the walls with al-
cohol, or sulphuric ether, is advised for cleansing purposes, to get
rid of the oil and other residue. HoAvever, simply Aviping the caA^-
ity out Avill not suffice. It must be thoroughly rubbed with an al-
cohol or ether-moistened cotton ball, folloAved by reasonable desic-
cation from the chip bloAver, and then every part of the Avails and
margins gone oA-er and freshly cut. This is the only means of ob-
taining a clean surface.
Leaks in Rubber Dam, particularly near the gingival outline,
must positively be detected. The portion which has become wet
should be dried Avith an absorbent and the air blast. Then all parts
which haA^e been moistened must be gone over and freshly cut.
Simply drying such portions is not adequate, as there is left salts
and albuminoids from the saliA'a and blood serum Avhich can only
be removed by the cutting instruments. The placing of a filling
over this gummy residue invites secondary caries. These deposits
Avill subsequently dissolve out, resulting in a leak. It may be small