title: Pulp canal obliteration following trauma to primary incisors: a 9-year clinical study.
abstract: OBJECTIVE
  The purpose of this study was to determine the occurrence of pulp canal obliteration (PCO) in traumatized primary maxillary central incisors and its association with secondary pulp necrosis, type of trauma, and further incidence of trauma.
  
  
  METHODS
  A retrospective  descriptive study on 112 traumatized teeth was carried out (9-year follow-up) using the clinical and radiographic data from 82 patient charts at the Traumatized Patient Care Program of the Universidade Federal de Santa Catarina.
  
  
  RESULTS
  A total of approximately 54% of the teeth exhibited  PCO; in approximately 58% of these cases, obliteration was diagnosed within 12 months following the trauma. An association between PCO and crown discoloration was confirmed (P<.001). PCO was not significantly associated with patient gender, age, type of trauma, or recurrence of trauma.  There were no cases of secondary pulp necrosis.
  
  
  CONCLUSIONS
  The findings of the present study reveal that the occurrence of PCO in traumatized primary teeth was high, while the type and recurrence of trauma were not risk factors for the development of PCO. Moreover, there was no association  between PCO and secondary pulp necrosis.
authors: Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil. biancazsantos@hotmail.com
authors: Bianca Zimmermann
authors: BZ
authors: Santos
authors: Mariane
authors: M
authors: Cardoso
authors: Izabel Cristina Santos
authors: IC
authors: Almeida
mesh_terms: D002675:Child, Preschool; D003784:Dental Pulp Calcification / Q000209:etiology*; D003790:Dental Pulp Necrosis / Q000209:etiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor / Q000293:injuries* / Q000473:pathology; D008297:Male; D008437:Maxilla; D012189:Retrospective Studies; D014075:Tooth Discoloration / Q000209:etiology; D018677:Tooth Injuries / Q000150:complications*; D014094:Tooth, Deciduous / Q000293:injuries*