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36 OPERATIVE DENTISTRY

consideration in cavity outline Avhen the rules previously given
have not carried the outline to comparatively safe and immune
localities.

I"ijj. 15.—Fillings in place in cavities shown in Figs. 13 and 14.

Fig. 16.—Another view of fillings shown in Fig. 15.
Extension for prevention does not mean tJie consideration of re-
sistance to stress. It bears no reference to decay of the dentine. It
has no relation to the management of frail walls.