Descriptive anatomy of the human teeth / by G.V. Black.

  • Greene Vardiman Black
Date:
[1897]
Catalogue details

Licence: Public Domain Mark

Credit: Descriptive anatomy of the human teeth / by G.V. Black. Source: Wellcome Collection.

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    prominent, or rises in the form of a tubercle, this groove is subject to much variation in it's course. Often, there is a deep pit in the center of its length; i. e., centrally in the lingual sur- face, at the margin of the linguo-gingival ridge (Fig. 3, m). From this, fissures may extend laterally. Occasionally, espe- cially in the lateral incisors, a sulcus, or a fissure divides the linguo-gingival ridge from one of the marginal ridges, and extends into the cementum (Fig. 10). This is the linguo- gingival fissure. 22. The root of the upper central incisor (Figs. 1 to 5) is about one and a fourth, to one and a half times as long as the crown. It is conical in form, tapering from the crown to the apex; less rapidly near the neck, and more rapidly as the apex is approached. Therefore, the body of the root seems a little swollen. However, the root of this tooth presents great variety of figure, as do the roots of teeth generally. The root is nearly round at the neck. The curvature of the lingual sur- face is the arc of a smaller circle than that of the labial. The proximate surfaces are slightly flattened. The flattened por- tion of the mesial surface is a little broader than the distal. These two converge to the lingual, giving the form of a prism with its angles rounded. UPPER LATERAL INCISOR. 23. The description of the lateral incisor may be much abridged, because of its resemblance to the central in its gen- eral form and developmental lines. The tooth is a little shorter, and from mesial to distal the crown is about a third narrower. ' 24. The labial surface of the lateral incisor (Fig. 6) is more rounded in the mesio-distal direction than in the cen- tral. The mesio-incisal angle is acute, and the cutting edge slopes away in a curve to a rounded and obtuse disto-incisal angle. The cutting edge, at the time of eruption, presents three tubercles, or mammelons, and the grooves crossing the edge between these are projected on the labial surface as shal- low labial grooves.
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