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SURGICAL ASATOMY. 591
enlarged bv an abnormal deposit of cementum caused by continued
hyperemia due to the prolonged irritation that the form of each root
is lost ; the bone also is much thickened. Fig. 531 shows an impacted
Fig. 530.
Right lialf of lower jaw.
tooth pressing directly against the one in front of it, the roots of which
have become much enlarged by the deposit of cementum. The sur-
rounding bone is also thickened and much more compact than the nor-
mal bone. The character of the cancellated tissue of the lower jaw is
lost by the deposit of bone caused by continued irritation of that tissue.
Fig. 531.
^=-^-^'^i
l.cft half of lower jaw.
Figs. 532 and 533 show the normal forms of the teeth, and Fig. 534
is taken from a group of abnormal teeth. If only normal conditions
of the teeth had to be considered, as shown in Figs. 532 and 533, ex-
