Supernumerary Causing Displacement

Case History:

A 3-year-old gelding in good condition was
brought to the wet lab for routine dental
evaluation. There was some foul odor
coming from the mouth and the horse seemed
moderately head shy while handling. Oral
examination revealed abnormalities within the
second quadrant. Lateral and dorsal ventral
radiographs were taken of the second molar
quadrant.

Evaluation:

The 206 is displaced rostrally due to pressure
from either a supernumerary tooth or a
deformed 606. It is highly unlikely that a
deciduous tooth would be stabilized enough to
cause this much displacement of an erupting
permanent tooth. However, a supernumerary
tooth would develop at approximately the
same time as the adjacent teeth, thus causing
misalignment as the teeth mature and erupt,
which seems to have occurred in this case.
Also, the size, deformity, and density of this
tooth is more consistent with a supernumerary
tooth than a deciduous tooth.

Treatment:

Extraction of this extra tooth is indicated and
should be accomplished as soon as possible
to allow repositioning of the 206 caudally.
Orthodontic pressure would be difficult to
obtain at this time due to lack of clinical
crown, but may be considered in 6 months if
adequate drifting of the 206 has not occurred.
Also, pressure placed on the clinical crown by
orthodontic wires or rubber bands causes the
tooth to tip and does not move the root and
reserve crown at the same rate, which may be
undesirable in this case. With time this tooth
should reposition itself if care is taken in the
future to remove any protuberance formed
by the opposing 306 as the teeth erupt and
mature.

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