Page 62 - My FlipBook

30 DENTAL ANATOMY
II
labial surface, and mark the location of the cervical line (gin-

gival, Black) with the pencil.
(e) Mark the location, taken by means of the Boley gauge,
of the future mesio-distal diameter of the neck of the tooth.
Then outline the convexity of the mesial and distal surfaces by
drawing a line from the contact points to these marks.

(f) With the file trim the blocks on the mesial and distal
sides nearly to the marks made in ''e," giving these sides the
proper convexity, the distal side being more convex. The
cuttings may be carried a distance of half way up the future
root of^the tooth (Fig. 35).

f f t •« 1^

Fig. 41.—Carvings in ivory.

(g) With the Boley gauge take the measurement for the
greatest labio-lingual diameter, which \\dll be at the gingival
ridge, and mark it on the mesial and distal sides of the block
(Figs. 36 and 37).

(h) Now, holding the block on its mesial or distal side, out-
line with the pencil the curvature of the labial and lingual sur-
face from the cutting edge to the cervical line.
(i) File to shape, carrying the labial and lingual cuttings a

distance of half way up the future root. The apical half or
third of the root is not carved, leaving the end of the block
untouched (Fig. 38).
To outline the curvature of the cervical line, find the
(j)
proper measurement from the "Table of Measurements" and
mark the length of curvature by means of the millimeter gauge