. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . Fig. 145. Fig. 146. Fig. 145.—Application of the compound mortise form to a mesio-occlusal cavityon an upper bicuspid. Fig. 146.—Step form in a mesio-occlusal cavity on an upper molar. stress of mastication is not great, use the simple mortise form. (Figs. 149, 150, 151.) Rule 5.—In proximo-incisal cavities, when the involvement GIVING THE CAVITY FOKM I05 of the incisal ecl^c is exlensive, use the double, compound orauxiliary mortise form, either in the shape of an incisal stepor a lingua


. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . Fig. 145. Fig. 146. Fig. 145.—Application of the compound mortise form to a mesio-occlusal cavityon an upper bicuspid. Fig. 146.—Step form in a mesio-occlusal cavity on an upper molar. stress of mastication is not great, use the simple mortise form. (Figs. 149, 150, 151.) Rule 5.—In proximo-incisal cavities, when the involvement GIVING THE CAVITY FOKM I05 of the incisal ecl^c is exlensive, use the double, compound orauxiliary mortise form, either in the shape of an incisal stepor a lingual step form (see Figs. 152, 153, 154, 155 and 159).Technic for Obtaining Resistance Form. Use hatchet and hoe excavators and straight-edged of these cut plane surfaces, joining at definite angles, andgive the box or mortise form. I. Pit and Fissure and Gingival Third Cavities.—Withthe excavators and chisels flatten the pulpal or axial wallof the ca\ity, and true up the lateral walls until they are plane


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