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472 THE TREATMENT AND FILLING OF ROOT CANALS.
complete. A 10 per cent, solution ol" snlf'ni'ic acid is piiinjx'd into the
canals by means of iridium l)roaelie.s ; this neutralizes any free alkali
Avhich may be present. The canal or canals are next washed out with
hot distilled water, dried with cotton, filled with alcohol, and well dried
by blasts of warm air.
Many operators immediately and permanently fill such canals
however, as there is the possibility that sterilization may not be abso-
lute, it is the usual })ractice to fill the canals tentatively yet perfectly.
Salol and a metallic point make an excellent canal fillin<>; in such
cases. When the canals and dentinal walls are dried by nutans of the
alcohol and warm blast they are filled with salol made very fluid, and
the metallic point thrust into the canal containing it. Some slight
pericemental disturbance may follow, but quickly subsides under the
influence of a counter-irritant applied to the gum over the root (tr.
iodin., tr. aconit. et chloroform, ad. pars wq. The crown cavity is sealed
with sticky temporary stopping for a few days, when if the condition
of the pericementum is found normal, the salol filling is removed (if
the operator desires) by heating a pair of tweezers and grasping the
protruding end of the metal cone. It is the general practice to then
fill the canal with oxychlorid or gutta-percha.
Should the case present evidences of profound change in the contents
of the tubules, i. e. much discoloration, the 50 per cent, solution of
sodium dioxid may be sealed in the canal for a day ; the next day the
canals are syringed freely with an acid solution of hydrogen dioxid.
Dr. Kirk advises that the dentin be saturated with the sodium dioxid
solution, then upon the addition of hydrochloric acid, hydrogen dioxid
is formed wherever the sodium has penetrated, and drives out the soapy
matters formed by the action of sodium hydroxid upon the products of
decomposition.
Preliminary to filling the canals it is the usual practice to fill them
for a few minutes with an antiseptic, which will exercise an influence
over a considerable period of time. Of all antiseptics, oil of cinnamon
gives evidence of the most prolonged presence when so placed.
Cases in which Pericementitis is Present.
The next class for consideration includes the cases in which the
tissues of the apical region are invaded. The first evidence of such
invasion is tenderness of the tooth upon pressure. The cause of this is,
no doubt, the inflammatory reaction of these tissues consequent upon con-
tact and absorption of the waste products of organisms which are
developing in the pulp canal. In the milder cases the tooth is sore to
the touch, is slightly loose and extruded, and the gum over the affected
root is redder than normal. Here, as in all grades of this disturbance,
472 THE TREATMENT AND FILLING OF ROOT CANALS.
complete. A 10 per cent, solution ol" snlf'ni'ic acid is piiinjx'd into the
canals by means of iridium l)roaelie.s ; this neutralizes any free alkali
Avhich may be present. The canal or canals are next washed out with
hot distilled water, dried with cotton, filled with alcohol, and well dried
by blasts of warm air.
Many operators immediately and permanently fill such canals
however, as there is the possibility that sterilization may not be abso-
lute, it is the usual })ractice to fill the canals tentatively yet perfectly.
Salol and a metallic point make an excellent canal fillin<>; in such
cases. When the canals and dentinal walls are dried by nutans of the
alcohol and warm blast they are filled with salol made very fluid, and
the metallic point thrust into the canal containing it. Some slight
pericemental disturbance may follow, but quickly subsides under the
influence of a counter-irritant applied to the gum over the root (tr.
iodin., tr. aconit. et chloroform, ad. pars wq. The crown cavity is sealed
with sticky temporary stopping for a few days, when if the condition
of the pericementum is found normal, the salol filling is removed (if
the operator desires) by heating a pair of tweezers and grasping the
protruding end of the metal cone. It is the general practice to then
fill the canal with oxychlorid or gutta-percha.
Should the case present evidences of profound change in the contents
of the tubules, i. e. much discoloration, the 50 per cent, solution of
sodium dioxid may be sealed in the canal for a day ; the next day the
canals are syringed freely with an acid solution of hydrogen dioxid.
Dr. Kirk advises that the dentin be saturated with the sodium dioxid
solution, then upon the addition of hydrochloric acid, hydrogen dioxid
is formed wherever the sodium has penetrated, and drives out the soapy
matters formed by the action of sodium hydroxid upon the products of
decomposition.
Preliminary to filling the canals it is the usual practice to fill them
for a few minutes with an antiseptic, which will exercise an influence
over a considerable period of time. Of all antiseptics, oil of cinnamon
gives evidence of the most prolonged presence when so placed.
Cases in which Pericementitis is Present.
The next class for consideration includes the cases in which the
tissues of the apical region are invaded. The first evidence of such
invasion is tenderness of the tooth upon pressure. The cause of this is,
no doubt, the inflammatory reaction of these tissues consequent upon con-
tact and absorption of the waste products of organisms which are
developing in the pulp canal. In the milder cases the tooth is sore to
the touch, is slightly loose and extruded, and the gum over the affected
root is redder than normal. Here, as in all grades of this disturbance,
