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76 OPERATIVE DENTISTRY

The Axio-Labial Line Angle is chased and sharpened for its entire
length, making it particularly definite as it approaches each of the
point angles.
The Axio-Lingnal Line Angle is made definite for one millimeter
in each direction from its two point angles, omitting the central por-

35.—Class Three cavities prepared for cohesive gold. While the cavity in the cuspid
l""ig.
(A) restores the mesial angle the shape of these cavities and the rules governing their man-
agement places them in Class Three.

ABC

Fig. 36.—Class Three filled. Cavities shown in Fig. 35.

tion, as this precaution will give added resistance form to the lingual
wall. The sharpening of these line angles is best accomplished by
engaging the instrument in the dentine the desired distance from
the point angle and cutting to the angle.
The Gingivo-Axial Line Angle should be Avell defined to make the