Why Are His Front Teeth Not Straight?

The father of a 7-year-old boy wonders why the upper central incisors, particularly #9, are off (Fig.1 3-D CT tooth coloring).  Fig.2 (bone coloring) does not reveal much. Fig.3 (MIP, more transparent) reveals a supernumerary tooth, called mesiodens (M, an extra central incisor, abnormally shaped (cone), near the midline).

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Xin Wei, DDS, PhD, MS 1st edition 01/14/2018, last revision 01/19/2018