title: Radicular maturity level of primary teeth and its association with trauma sequelae.
abstract: OBJECTIVE
  This study aimed to investigate the influence of the radicular maturity level of primary teeth on the sequelae of traumatic dental injury (TDI).
  
  
  METHODS
  A longitudinal retrospective study that collected data from dental records and radiographs of patients with TDI in one or both maxillary primary central incisors was conducted. Sequelae such as crown discoloration, pulp canal obliteration (PCO) and inflammatory root resorption (IRR) were evaluated during a 12- to 18-month follow-up period after the trauma.
  
  
  RESULTS
  Of the 132 patients included in the study, 103 (78%) had luxations and 29 (22%) had dental fractures. At the initial postinjury examination, 12 teeth (9.1%) were found to have immature roots, 107 (81.1%) had closed apexes and 13 (9.8%) had visible root resorption. Inflammatory root resorption occurred mostly in traumatized teeth that presented with physiological root resorption at the moment of trauma (P = 0.004). The frequency of PCO was higher in teeth with a closed apex at the moment of the injury (P = 0.026). There was also an association between the type of injury and the occurrence of crown discoloration (P = 0.008) as well as between the type of injury and the development of PCO (P = 0.001).
  
  
  CONCLUSIONS
  The occurrence of TDI sequelae can be determined by the type of injury as well as by the radicular maturity level of the primary teeth at the moment of injury.
authors.affiliation: Post-Graduate Program in Pediatric Dentistry, Federal University of Pelotas, Pelotas, RS, Brazil.
authors.forename: Aya
authors.initials: A
authors.lastname: Qassem
authors.forename: Marília
authors.initials: M
authors.lastname: Goettems
authors.forename: Dione D
authors.initials: DD
authors.lastname: Torriani
authors.forename: Fernanda G
authors.initials: FG
authors.lastname: Pappen
mesh_terms: D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D008137:Longitudinal Studies; D008297:Male; D012189:Retrospective Studies; D018677:Tooth Injuries / Q000473:pathology*; D014094:Tooth, Deciduous / Q000254:growth & development* / Q000293:injuries
keywords: dental trauma; primary tooth; root resorption; tooth injury