For intrusive luxation injuries, ﬁxation period is about:
2 weeks only
4 weeks
4 weeks with semi rigid and 2 week with rigid
6 to 8 weeks
Intrusion

Most severe form of luxation injuries.
Displacement is seen.
TOP is positive.
Mobility is not seen. 
High pitched metallic sound on percussion is heard. 
Splinting should be done for 4 weeks.