. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . Fig. 127.—Outline form. Occlu-sal cavity in a lower second bicus-pid \\-ith three cusps. Fig. 128.—Outline form. Occlusalcavities in upper molars. In the secondmolar the two cavaties have so under-mined the oblique ridge that it hasbeen necessarj to unite them. remove enough of the plaster to estabHsh a definite ca\ity. (2) On the Technic Block.—(a) With a pencil draw theoutline form, (b) With chisels and excavators remove enoughof the tooth substance to estabhsh a definite cavity. (3) On
. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . Fig. 127.—Outline form. Occlu-sal cavity in a lower second bicus-pid \\-ith three cusps. Fig. 128.—Outline form. Occlusalcavities in upper molars. In the secondmolar the two cavaties have so under-mined the oblique ridge that it hasbeen necessarj to unite them. remove enough of the plaster to estabHsh a definite ca\ity. (2) On the Technic Block.—(a) With a pencil draw theoutline form, (b) With chisels and excavators remove enoughof the tooth substance to estabhsh a definite cavity. (3) On Extracted Teeth.—(a) With a pencil draw theoutline form, (b) With the chisel cut away the overhanging lOO PREPARATION OF CAVITIES and unsupported enamel, (c) If necessary to extend further,first remove the underlying dentin with excavators (hoes,hatchets and spoons) and then chisel the enamel the desireddistance. 2. REMOVE THE DECAY.—Complete removal of decayis essential. If the minutest portion be left unsterilized, decaywiU continue, producing irritation of the pulp via the dentinalfibril
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