Tooth fractures can be classified as follows:
Uncomplicated crown fracture = fracture limited
to the crown of the tooth with dentin exposure
but no pulp exposure.
Uncomplicated crown/root fracture = a fracture
that involves the crown of the tooth and extends
below the gum line to also affect the root of the
tooth, with dentin exposure but without pulp
exposure.
Complicated crown fracture = fracture limited to
the crown of the tooth that does involve pulp
exposure.
Complicated crown/root fracture = a fracture that
involves the crown of the tooth and extends
below the gum line to also affect the root of the
tooth, and involves pulp exposure.