Altered passive eruption and altered active eruption. Ref: 75

Tooth eruption consists of two distinct phases: active eruption and passive eruption.
passive eruption.
In the active eruption phase, the tooth emerges through the gingiva to its final position in the mouth, but part of the crown is still covered by gingiva.
in the mouth, but part of the crown is still covered by gingiva.
In the passive eruption phase, the gingiva covering the crown gradually recedes towards the root of the tooth until it is exposed.
the root of the tooth until its entirety is exposed.
Altered active eruption occurs when the tooth has erupted to its final position,
but the bone has not migrated correctly towards the root, remaining located very close to the crown.
crown.