Page 450 - My FlipBook

448 THE TREATMENT AND FILLING OF ROOT CANALS.

of the roots. Two distinct canals may be present even in the absence
of l)if iircation of the root. The roots of this tooth may be much curved.
Fig. 413 presents a condition occasionally seen : a triiurcation of the
root of a bicuspid. Fig. 414 represents a section through the buccal
roots; Fig. 414 also shows the neck section of the tooth. In the same
mouth Mere found three bicuspids exhibiting the same condition. The
bifurcated cuspid, Fig. 411, was from the same denture.
Upper Second Bicuspid.— Sections of two typical forms of upper
In such a case as b—
second bicuspid are shown in Fig. 415, a and h.
far from uncommon—it will readily be seen what dangers exist as to
the difficulty of perfectly filling the flat general canal beyond the ellip-
tical obstruction. The neck section in both types is almost alike.
Upper First Molar.—The neck section of the up})er first molar

Fig. 415. Fig. 416.

Upper second bicuspid. Upper first molar.
(Fig. 416, a) shows a free entrance to the palatal root; the anterior
buccal root has a triangular entrance, near the mesio-buccal angle of
the tooth. The entrance to the disto-buccal root is very small; h, Fig.
416, shows a section through the buccal roots of the tooth. Cases are
occasionally seen where a short crown is associated with very long and
divergent roots (Fig. 417).

Fig. 418. Fig. 419.

Upper molar. Upper second molars.

Upper Second 3IoIar.—The arrangement of canals in the* second
upper molar (Fig. 418, a) is much like that in the first; except that
the tooth has a compressed form which brings the canal entrances closer
together. A section through the buccal roots is seen in Fig. 418, 6.
This tooth occasionally presents marked aberrations in the location and