. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . Fig. 165.—Radiation of enamel rods on anincisor. Labial view. (Diagrammatic.) Fig. 166.—Proximal view of acentral incisor showing radiationof enamel rods. (Diagrammatic.) (Figs. 165 and 166). (i) On incisal surfaces the rods areperpendicular to the long axis of the tooth; (2) at the anglesthe rods on the incisal and axial surfaces approach each other;(3) while on axial surfaces they He more or less horizontal tothe long axis of the tooth; (4) radiating gingivally as thecervix is approache
. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . Fig. 165.—Radiation of enamel rods on anincisor. Labial view. (Diagrammatic.) Fig. 166.—Proximal view of acentral incisor showing radiationof enamel rods. (Diagrammatic.) (Figs. 165 and 166). (i) On incisal surfaces the rods areperpendicular to the long axis of the tooth; (2) at the anglesthe rods on the incisal and axial surfaces approach each other;(3) while on axial surfaces they He more or less horizontal tothe long axis of the tooth; (4) radiating gingivally as thecervix is approached. In the manipulations incident to the fourth step of cavitypreparation, the established law is to bevel the enamel mar- BEVELING ENAMEL MARGINS II5 gins outward, following the direction of the rods in the loca-tion in which we arc working. The dentin is the naturalsupport of the enamel. A study of the accompanying illus-trations will demonstrate why bevel of these margins is nec-essary in order that no rods be left unsupported, the amountof bevel depending on the direction of the rods. In pit an
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