Page 53 - My FlipBook

DRAWINGS 21

by letters the location of the surfaces, margins, line and
point angles of a lower molar.

1 6. Draw and shade the buccal surface of [6 and | 7 show-
,
ing crown and roots (Figs. 24 and 25).
17. Draw and shade the mesial surface of crown and roots
of 6 (Fig. 26).

Fig. 23.—Diagrammatic drawing to show the surfaces and line and point angles
on lower molars. —
First Diagram. A, Mesial surface; B, buccal surface; C, occlusal surface.
—
Second Diagram. Line angles. A, Mesio-lingual angle; B, occluso-lingual
angle; C, disto-occlusal angle; D, bucco-occlusal angle; E, mesio-occlusal angle; F,
disto-buccal angle; G, H, gingival line.
—
Third Diagram. Point angles. A, Mesio-linguo-occlusal; B, mesio-bucco-
occlusal; C, Disto-linguo-occlusal; D, disto-bucco-occlusal; E, disto-bucco-gingival;
Fj mesio-bucco-gingival; G, mesio-linguo-gingival point angles.

18. Draw a trapezoidal figure, Fig. 27, and outline occlusal
surface of | 6 , indicating location of the ridges, grooves and
lobes.

19. Draw a parallelogram, Fig. 28, and outline the oc-
clusal surface of 7 |, indicating the location of the ridges,
grooves and lobes.