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HISTOLOGICAL REQUIREMENTS IN ENAMEL WALLS. 115

Fig. 96 shows a cavity prepared in the buccal surface of an upper
molar. The occlusal margin is placed in the occlusal half of the middle
third, and the gingival margin in the gingival half of the gingival third

Fig. 97.

2. Wall as trimmed.
Preparation of occlusal wall of Fig. 96. (About 70 x.)

of the surfoce. In the occlusal wall the rods are inclined occlu.sally
about 8 centigrades (28°) from the horizontal ]>lane. After cleaving,
the broken and slivered rods should be shaved away, but the angle can-