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468 Tin: TREATMENT AND FILLING OF ROOT CANALS.
material runs into the canal. Slowly witlidi'awinu- the prohc, the fluid
runs into the .space oe('U])ie(l hv the j)rol)e, tilling- the canal to the ajx'x
;
it is advisable, however, to warm a broach, aud by a i)innping motion
Fig. 459. Fig. 460.
insure the carrying of the filling to all parts of the canal. If salol be
employed a cone of gntta-])ercha of such size as may be readily carried
to the apex should be thrust into the fluid material, virtually filling the
greater portion of the canal with gutta-percha. Several trustworthy
observers have noted a disappearance of salol from canals in which it
has been placed ; the gutta-percha minimizes the risk attendant upon
such disajipearance. The gutta-percha subserves another purpose
should it ever be necessary to remove the canal filling, blasts of warm
air directed against the end of the gutta-percha may be made to melt
the salol al)out it, wdien the cone may be readily withdrawn. This
melting and withdrawal are more quickly accomplished if the central
mass be of metal.
Paraffin is unchangeable in the conditions under Avhich it is placed.
Treatment of Root Canals with Mummified Pulps.
The remaining member of the aseptic cases is that of mummified
pulp. So long as these cases remain perfectly aseptic they give rise to
no symptoms and are, as a rule, uncovered by accident, rarely by design.
Their usual history is as follows : At some time (perhaps years)
before, an exposed or almost exposed pnlp has been covered with a cap
or cavity lining of the oxychlorid of zinc. They have remained com-
fortable thereafter. At some subsequent time it may be necessary to
open the tooth, usually on account of recurring caries : the total
absence of dentinal sensitivity is noted, the tooth has changed color but
468 Tin: TREATMENT AND FILLING OF ROOT CANALS.
material runs into the canal. Slowly witlidi'awinu- the prohc, the fluid
runs into the .space oe('U])ie(l hv the j)rol)e, tilling- the canal to the ajx'x
;
it is advisable, however, to warm a broach, aud by a i)innping motion
Fig. 459. Fig. 460.
insure the carrying of the filling to all parts of the canal. If salol be
employed a cone of gntta-])ercha of such size as may be readily carried
to the apex should be thrust into the fluid material, virtually filling the
greater portion of the canal with gutta-percha. Several trustworthy
observers have noted a disappearance of salol from canals in which it
has been placed ; the gutta-percha minimizes the risk attendant upon
such disajipearance. The gutta-percha subserves another purpose
should it ever be necessary to remove the canal filling, blasts of warm
air directed against the end of the gutta-percha may be made to melt
the salol al)out it, wdien the cone may be readily withdrawn. This
melting and withdrawal are more quickly accomplished if the central
mass be of metal.
Paraffin is unchangeable in the conditions under Avhich it is placed.
Treatment of Root Canals with Mummified Pulps.
The remaining member of the aseptic cases is that of mummified
pulp. So long as these cases remain perfectly aseptic they give rise to
no symptoms and are, as a rule, uncovered by accident, rarely by design.
Their usual history is as follows : At some time (perhaps years)
before, an exposed or almost exposed pnlp has been covered with a cap
or cavity lining of the oxychlorid of zinc. They have remained com-
fortable thereafter. At some subsequent time it may be necessary to
open the tooth, usually on account of recurring caries : the total
absence of dentinal sensitivity is noted, the tooth has changed color but
