Page 120 - My FlipBook

lis DENTAL HISTOLOGY AND OPERATIVE DENTls'lIlY

ridges are many short rods whieli do not reach the dentin, and tiiese
are usually very much twisted about each otlier, so as to form the
strongest possible keystone in the perfect structure. In j)re]>aring a

Fig. 100.

Enamel over tip of dentin cusp : D, dentin cusp. (About 80 X.)

margin in such a position it is impossible to have the rods wliich
form the margin reach the dentin with their inner ends, and these
short rods are sure either to break in completing the operation or to