The treatment for a permanent tooth with a closed root end, and intruded less than 3 mm, is to allow the tooth to erupt without intervention. If no movement is evident after 2 to 4 weeks, the tooth may be repositioned either orthodontically or surgically before ankylosis can take place. If the tooth is intruded 7 mm or more, the tooth is repositioned surgically and stabilized for 4 to 8 weeks by means of a flexible splint. In most instances the pulp will become necrotic with intrusive injuries in teeth with complete root formation. Root canal treatment should be initiated, with calcium hydroxide as a temporary canal- filling material, 2 to 3 weeks after stabilization. The treatment for an intruded permanent tooth with incomplete root formation is to allow it to erupt spontaneously. If no movement is seen within a few weeks, orthodontic repositioning should  begin.  If  the tooth is intruded 7 mm or more, the tooth can be repositioned surgically and stabilized by means of a flexible splint. Endodontic therapy is often required, however, and the tooth  should be monitored closely while a decision on endodontic therapy is pending.