. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . Fig. 156. Fig. 157. Fig. 156.—Simple cavity on the proximal surface of a bicuspid. A form which isseldom, if ever, admissible. Fig. 157.—Proximo-occlusal cavity an an upper bicuspid. Step form. lateral walls plane surfaces, joining the floor at definite lineangles. 4. Cavities in Proximal Surfaces of Bicuspids and Molars. —Extend the cavity through the marginal ridge on to theocclusal surface. When the occlusal grooves and fossae areperfect and the strength of the buccal and lingual walls
. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . Fig. 156. Fig. 157. Fig. 156.—Simple cavity on the proximal surface of a bicuspid. A form which isseldom, if ever, admissible. Fig. 157.—Proximo-occlusal cavity an an upper bicuspid. Step form. lateral walls plane surfaces, joining the floor at definite lineangles. 4. Cavities in Proximal Surfaces of Bicuspids and Molars. —Extend the cavity through the marginal ridge on to theocclusal surface. When the occlusal grooves and fossae areperfect and the strength of the buccal and lingual walls per-mits, the simple mortise form involving the proximal andocclusal surfaces maybe adopted (Rule 2) (see Figs. 135 and[44). In the majority of cases, however, the cavity is madeto include the occlusal groove or fossa, utilizing the com- GIVING THE CAVITY FORM 109 pound mortise or step form, (a) Simple mortise form. Jnnatural teeth, remove the dentin underlying the marginalridge with the hoe or hatchet excavator, and then chiselaway the enamel, carrying the cavity well over on to theocclusal su
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