impacted

Adjective

im=pact=ed

WORDNET DICTIONARY

impacted(s = adj.all) wedged - wedged or packed in together; "an impacted tooth"

impacted, a.

Driven together or close. [1913 Webster]
Grown in an abnormal direction so that it is wedged against another tooth and cannot erupt normally; -- of teeth, especially the third molar; as, to extract an impacted third molar. [PJC]

Impacted fracture (Surg.), a fracture in which the fragments are driven into each other so as to be immovable.