Page 585 - My FlipBook

SURGICAL ANA TOM Y. 583
trations give a correct idea of the relations of the teeth to the internal
structures of the jaw.
Figs. 516 and 517 are good ilhistrations of the relations of the roots

Onii

1 Oins, OpcuiuK maxilliiry sinus; 1ft M, I'lTt^t molar.
with the floor of the maxillary sinus usually found in the M'hite race.
In the negro there is usually a considerable thickness between the
teeth and the floor of the sinus. It will be noticed that the roots of
the molars pass up on l)()th sides of the sinus, and because of this fact
it is necessary in extractiug teeth from a jaw of this character to use
Fk;. olS.

Arlst ^f, Anterior root of lirst molar; li M Bi, root of secoud bicuspid; Idn, inferior dental
nerve ; U, U-shaped or cortical portion of lower jaw.
the greatest caution, otherwise a ])<)rti(»u of the floor of tliat cavity might
also be removed. Or if a tooth l)e broken and much ujiward force used