title: [Retrospective study about periodontal ligament healing of replanted permanent teeth in children].
abstract: OBJECTIVE
  To analyze the prognosis about periodontal ligament healing of replanted permanent teeth in children and to examine the associated factors.
  
  
  METHODS
  The sample consisted of 49 children with 61 avulsed permanent teeth, whose injuries had been managed in the period from 2000 to 2012. The clinical data of replanted teeth were collected, and the follow-up period was no less than 12 months. The factors were analyzed in relation to postoperative outcomes, classified as functional periodontal healing (FH), infection-related (inflammatory) resorption (IRR) and replacement resorption (RR).
  
  
  RESULTS
  The functional healing rate was 23.0%, while replacement resorption rate was 72.1%. The replacement resorption (ankylosis) was usually observed earlier by clinical examination than by radiographic examination. 86.0% (40/47) resorptive processes were diagnosed within the first year. Physiological storages, such as milk, saline and saliva were significantly better to periodontal ligament healing than nonphysiological storages, such as tap water and sterilizing solutions (chloramine and alcohol). Functional healing was found significantly more frequent in canines and premolars.
  
  
  CONCLUSIONS
  The factor significantly affecting periodontal ligament healing is storage medium. Replacement resorption is the most common type of root resorption. The replacement resorption diagnosis must combine the radiographic examination with the clinical examination. It is better to follow up more than 1 year after tooth replantation.
authors.affiliation: Department of Oral Emergency, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: J
authors.initials: J
authors.lastname: Bai
authors.affiliation: Department of Pediatric Dentistry, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Y M
authors.initials: YM
authors.lastname: Zhao
authors.affiliation: Department of Pediatric Dentistry, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: M
authors.initials: M
authors.lastname: Qin
mesh_terms: D002648:Child; D019229:Dentition, Permanent; D006801:Humans; D010513:Periodontal Ligament; D012189:Retrospective Studies; D012391:Root Resorption; D014084:Tooth Avulsion; D014090:Tooth Replantation; D014945:Wound Healing