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KlG. 247

Kio. 248.

Kk;. 24U.

Kl(!S. 247-250. A sriics illiisl.i;iliiig :i fnniiiiuii t;i\ i(y funii the iiirsiiil snrface of a ciMilral
incisor.
Fki. 247. The mesial surface of a central incisor showing the apparent decayed area. Examina-
tion of the lateral extension shows considerable undermining of enamel, and especially that the
mesio-lingiial marginal ridge is iindennined.
Fio. 24S. A cavity preparation with rounded gingival wall. This should never he used.
Fig. 249. The correct preparation with the gingival wall horizontal and with the labio-gingival
and the linguo-gingival angles widely extended. Other parts of the cavity are cut no broader.
Notice that the mesio-lingual angle of the tooth is cut away in both.
250. cavity has been finished. the c-'itension of (ho lingual
l-'iG. The filled and This shews
portion better than the cavity illustration.
26a