In this type of luxation, the tooth is extruded from its
socket. As such, minimal damage to the socket wall
occurs. A recent study involving a paediatric
population found that extrusive luxation led to pulp
necrosis in 43 per cent of teeth, usually within one
year.
Pulp canal calcification was observed in 35 per
cent and progressive root resorption in 5.5 per cent of
cases.
A direct correlation has been established
between the degree of extrusion and the incidence of
pulp canal obliteration but not necrosis in a recent
study in children.
The incidence of complications with
severely extruded teeth was very similar to those of
avulsed teeth where the teeth were stored in a suitable
physiological medium.