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222 THE TREATMENT OF PULPS

in the same direction by means of the same instrument or a
cleoid excavator.
(f) Make the walls of the cavity and pulp chamber con-
tinuous and smooth.

(g) Remove all debris.

Fig. 262. Fig. 263.
Fig. 262.—Straighten the approach to the canal on the lingual side by means of
the fissure bur. The passage of a small broach to the apex has thus been rendered
easy by the removal of the small shoulder at the entrance to the same shown in the
preceding illustration.
Fig. 263.—Place the dentate fissure bur in position and open the chamber to its
incisal extremity, thus removing the horns of the pulp chamber with their contents
The walls of the cavity, pulp chamber and canal are now continuous and smooth.

Technic for Opening into Canals

There is no operation in the entire field of dentistry or

surgery, which requires greater skill than that of the proper
opening and filling of root canals. There is none which has a
more far-reaching influence on the future health and well-
being of the patient. The non-removal of pulp remnants,
the imperfect opening, enlarging and sterilization of the canal

to the apex, or the failure to hermetically seal it for its
entire length, results in the leaving of an inviting field for the
continuance or establishment of the septic condition, which
may later undermine the health and produce even death of the