Page 42 - My FlipBook

lO DENTAL ANATOMY

The drawings and carvings should be done to Black's

average measurements, natural size or enlarged as indicated,
by means of a Boley millimeter gauge (Fig. 59).

Average Measurements of the Teeth, Taken from Black's
Dental Anatomy

''The lines of measurement are:
ist. ''Length over all": Length of the tooth from the

cutting edge, or buccal cusp, to the apex of the root.
2nd. "Length of crown": Length of the crown from the
cutting edge, or buccal cusp, to the gingival line on the labial
or buccal surface.
3rd. "Length of root": Length of root from the gingival

line on the buccal surface to the apex of the root.
4th. " Mesio-distal diameter of crown": This is the ex-
tent from mesial to distal in the greatest diameter, or at the
points of proximate contact.
5th. "Mesio-distal diameter of neck": This measurement

was made at the gingival line.
6th. "Labio- or bucco-lingual diameter": This measure-
ment was taken at the greatest diameter of the crown in the
direction named. In the incisors it was on the gingival ridge.
In the bicuspids and molars it was generally mid-length of the

crown, but occasionally it was near the gingival line, especially
in the upper second and third molars.
yth. "Curvature of the gingival line": This is the height
or extent of the curve of the gingival line toward the cutting
edge, or occlusal surface, as it passes from labial to lingual,
measured on the mesial surface."