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i8 DENTAL ANATOMY

9. Outline the mesial or distal surface of 4 within a figure
as indicated in No. i reversed, showing relative size of buccal

and lingual cusps and curvature of cervical line (Fig. 15).
10. Draw the occlusal surface of _^, three times en-

larged, indicating the location of the ridges and grooves by
initials on the drawing. Make the drawing within a figure
of trapezoidal or keystone shape (Fig. 16).

D-'/

Fig. 18.—Right upper first Fig. 19.—Right upper first molar. Oc-
molar. Buccal surface. A, clusal surface. A, Disto-lingual cusp; B,
Buccal groove; B, cervical fifth cusp; C, mesio-buccal cusp; D, disto-
line; C, mesio-bucco-occlusal buccal cusp; E, disto-lingual angle; F, buc-
angle; D, disto-lingual cusp. cal groove; G, mesial groove; H, disto-lin-
gual groove; /, distal groove.

II. Make a drawing showing the location of points of the
buccal cusps of and 4 | 5 . According to Black's Den-
|_£, |_5_ | ,
tal Anatomy they are most frequently located as follows, viz.
Upper first bicuspid, point of the cusp to the distal.
Upper second bicuspid, point of the cusp to the mesial.
Lower first bicuspid, point of the cusp to the distal.
Lower second bicuspid, point of the cusp to the mesial.

This does not obtain in many instances (Fig. 17).