Page 586 - My FlipBook

584 EXTRACTION OF TEETH.

in endeavoring to take hold of the root, the hitter could easily he forced
into the sinus. Tiie lower portion of Fig. 516 gives a general idea
of a transverse section of the lower jaw made posterior to the mental
foramen. Especial attention is drawn to the U-shaped formation of
the cortical portion of the lower jaw which terminates in the two plates
of the alveolar j)rocess, and between which the roots are imbedded in
the cancellated tissue. It also show\s how the roots extend toward the
inferior dental nerve. There is no line of dciiiarkation between the
alveolar process and the body of the bone.
Fig. 518 shows the relation, length, and })osition of the second bicus-

FiG. 519.

pid, showing that its root is sometimes placed to the inner side of the
anterior root of the first molar. The roots of these bicuspids are flat, as
will be seen by looking at Fig. 533. On taking into consideration their