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pass through : on which account the new tooth takes an
improper direction, and generally comes through on the
inside.
Cases are very frequent in which scarcely any absorption
of the fangs of the temporary teeth have taken place, pre-
vious to the appearance of several of the permanent teeth ;
and it often happens, that upon the removal of the shedding
teeth to give room for the permanent ones, that no absorption
of the fangs of the temporary teeth has taken place. Irreg-
ularity of the permanent teeth is most commonly occasioned
by the resistance made by the nearest temporary teeth ; this
is always the case if the temporary teeth are small and close
set, for, as the permanent incisores are much larger than the
temporary, they require more room ; but as the space left
by the shedding of the temporary teeth is too small for the
regular position of the permanent ; they are exposed to the
pressure of the next tooth, and hence are frequently turned
out of their right direction.
Another cause of the irregularity of the teeth arises from
the permanent teeth being too large for the space occupied by
the temporary ones ; those parts of the jaws not being suf-
ficiently extended to permit a regular position of the new
teeth. In this case the irregularity is considerable, and occa-
sions great deformity in the appearance of the mouth. The
incisores and cuspidati being much larger than those of the
child, require more room, for want of which they are turn-
ed out of their proper positions. The central incisores over
lap each other, the lateral incisores are either placed obliquely,
willi their edges turned forwards, or they are pushed back,
and stand between and behind the central incisores and the
r.ugpidati 5 the cuspidati are projected, occasioning the lip to
si and out with considerable prominence, and the bicuspides
are placed very irregularly.