[A retrospective study of pulp healing after luxation injuries].

Objective: To evaluate the prognosis of luxated permanent teeth and analyze the associated factors of pulp healing after luxation injuries.
Methods: The dental records of patients presented for treatment due to luxation injuries at the Department of Pediatric Dentistry, Peking University School and Hospital of Stomatology from January 2000 to December 2006 were collected, and the follow-up period was not shorter than six months. The following information was recorded, age and gender; type of injury; location of injured tooth; stage of root development; time elapsed between the injury and the first dental care; emergency treatment or not; pulp healing. Logistic regression was used to compare qualitative data and determine the associated factors of pulp healing after luxation injuries.
Results: The study was comprised of 157 patients with 238 luxated permanent teeth. The frequency of pulp necrosis was 16.0%, dental pulp calcification 2.1% and pulp survival 81.9%. The frequency of pulp necrosis was highest in intrusion (66.7%). The factors significantly affecting pulp healing were stage of root development and type of injury.
Conclusions: The risk of pulp necrosis was greatest in intrusion. The stage of root development and the type of injury were significant factors related to pulp healing after luxation injuries.