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84 OPERATIVE DENTISTRY

111 Fig. 41, a is the fulcrum and h the extreme point of the angle.
Dotted lines a-h are the radii of the circles the arcs of Avhich the
point angle fillings Avould describe in going to exit. The two
gingival point angles should be of different depths so that they will
describe the arcs of different circles in being drawn to exit. It is
most convenient to make the gingivo-axio-lingual the deeper.

A B
I'ig. 4l.—A study in the jiropcr placing and depth of the gingival angles.

-J

Fig. 42.—A study of the planes in which the gingival angles should be laid.
It is also essential that the two gingival point angles be so laid
that the circles, the arcs of which the point angle fillings describe in
passing to exit, stand in different planes as illustrated in Fig. 42.
Failure to observe the last two principles given removes retention
form as regards the gingival angles.