If abortion (disruption of tooth formation) occurs early, the extra tooth has almost no tooth appearance (Fig.8,9).  Instead the extra tooth has two portions: white mass (O) and dark area (L).  In fact the white mass represents hard portion of tooth structures (mixture of enamel and dentin), whereas the dark area is soft tissue of the tooth (pulp, nerve, normally inside the tooth). The white mass is larger and denser in Fig.8 than that in Fig.9, whereas the dark area is smaller than that in Fig.9. Return to main article

Xin Wei, DDS, PhD, MS 1st edition 07/14/2012, last revision 07/15/2012