The surface of enamel rod prisms in permanent teeth is:
A. Perpendicular to the outer surface of the tooth
B. Parallel to the outer surface of the tooth
C. Parallel to enamel contour
D. Parallel to enamel-dentine contour
A. Perpendicular to the outer surface of the tooth
B. Parallel to the outer surface of the tooth
C. Parallel to enamel contour
D. Parallel to enamel-dentine contour