. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . Fig. 140. Fig. 141. Fig. 142. Fig. 140.—Cavity in the gingival third of the labial surface of a right upper centralincisor. Pig. 141.—.other form of prci)aration for cavities located on the gingival 142.—Cavity involving the lingual pit of a left upper lateral incisor. molars, where the strength of buccal and lingual walls willpermit and there is no decay on the occlusal surface, use thesimple mortise form involving two surfaces (see Fig. 144). I04 PREPARATION OF CAVITIES Rule
. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . Fig. 140. Fig. 141. Fig. 142. Fig. 140.—Cavity in the gingival third of the labial surface of a right upper centralincisor. Pig. 141.—.other form of prci)aration for cavities located on the gingival 142.—Cavity involving the lingual pit of a left upper lateral incisor. molars, where the strength of buccal and lingual walls willpermit and there is no decay on the occlusal surface, use thesimple mortise form involving two surfaces (see Fig. 144). I04 PREPARATION OF CAVITIES Rule 3.—In proximo-occlusal cavities in other cases thanthe above, use the double, compound or auxiliary mortise form (step form) (Fig. 145 and 146)..
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