Abstract: Objective: To follow up and have a detailed review of the X-ray film of intrusive luxation immature permanent teeth. And to observe tooth restoration, root development as well as root resorption, and analyze the associated factors. Methods: By collecting the diagnosis and treatment data of intrusive luxation immature permanent teeth which were admitted from January 2013 to March 2019, X-ray films, teeth restoration, and root development and resorption were analyzed. Results: All teeth were finished restoration, in which root development accounted for 66.7% and replacement resorption accounted for 25%. Mild intrusion was beneficial to reduce pulp necrosis (P=0.008) and re-eruption could reduce replacement resorption (P=0.005). The root of tooth with survived pulp continued to grow, without the sign of replacement resorption (P<0.001). Conclusion: The pulp of immature permanent tooth with intrusive luxation can survive, with its root continuing to grow. Pulp survival is beneficial for root development, reducing the replacement resorption. However, in severe intrusion immature permanent tooth, there is a potential eruption.

Key words: tooth intrusive luxation, immature permanent tooth, tooth resorption, X-ray