Page 393 - My FlipBook

Fio. 227. Fio. 228.

Fia. 229.

Fig. 231. Fig. 232.

Figs. 227-232. A series illustrating the nianngemcnt of weak angles of the bicuspids.
Fig. 227. The first bicuspid in contact with the cuspid, showing a decay broken through the
marginal ridge.
Fig. 228. The appearance of the cavity from the mesial view.
Fig. 229. The cavity prepared by the older plan of removing some of the frailer portions of
the undermined enamel and the decay without properly forming the cavity.
Fig. 230. A careful uncovering of the whole of the area of decay by chipping away until the
enamel is found supported by sound dentin shows that the whole of the mesio-buccal angle must be
removed to, and just past, the mesial buccal groove. The result of this and the cutting of the box
form of cavity with the occlusal step gives the correct cavity preparation.
Fig. 231. The filling from the mesial view.
Fig. 232. The filling from the occlusal view.
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