The American Text-Book of Operative Dentistry

The American Text-Book of Operative Dentistry

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 edition. Excerpt: ...the line of the general axis. In rare cases a bifurcation of the root is seen (Figs. 317, 318). The upper first bicuspid very commonly exhibits a bifurcation of the roots which may extend to any distance toward the crown (Fig. 319), At its entrance the pulp canal has a dumb-bell form, the handle of the-dumb-bell being much attenuated. The distinct canals may begin almost at the base of the chamber, or be evident only near the apices of the roots. Two distinct canals may be present even in the absence of bifurcation of the root. The roots of this tooth may be much curved.-Fro. 319. Fm. 320. Fm. 321. Fig. 320 presents a condition occasionally seen: a trifureation of the root of a bicuspid. Fig. 321 represents a section through the buccal roots; Fig. 321 also shows the neck section of the tooth. In the same mouth were found three bicuspids exhibiting the same condition. The bifurcated cuspid, Fig. 318, was from the same denture. Upper Second Bicu.spid.--Sections of two typical forms of upper second bicuspid are shown in Fig. 322, a and b. In such a case as b--far from uncommon--it will readily be seen what dangers exist as to difficulty of perfectly filling the flat general canal beyond the elliptical obstruction. The neck section in both types is almost alike. Upper First llIolar.--The neck section of the upper first molar (Fig. 323, 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; b, Fig. 323, 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. 324). b a b Upper molar. Upper second more

Product details

  • Paperback | 234 pages
  • 189 x 246 x 12mm | 426g
  • United States
  • English
  • black & white illustrations
  • 1236799097
  • 9781236799098