title: Continued root formation of a pulpless permanent incisor following root canal treatment: a case report.
abstract: OBJECTIVE
  To present a case of a pulpless permanent incisor that continued root formation following root canal treatment.
  
  
  CONCLUSIONS
  A healthy 8-year-old girl with a history of dental trauma resulting in a coronal fracture involving enamel, dentine and pulp was referred by her general dental practitioner for treatment and evaluation of tooth 21. The tooth had a necrotic pulp and periapical rarefaction was evident radiographically. The canal was prepared, dressed with Ca(OH)2 and then filled with a rolled gutta percha cone and Roth's root canal sealer. A radiograph exposed eight years post-treatment, showed evidence of continued apical formation.
  
  
  CONCLUSIONS
  *Teeth with necrotic pulps and periapical rarefaction may show evidence of continued apical formation after root canal treatment. *Hertwig's epithelial root sheath may be more resistant than expected to trauma and infection.
authors.affiliation: Department of Endodontics, School of Dental Medicine, Shiraz University of Medical Sciences, Shiraz, Iran. dentendo@sums.ac.ir
authors.forename: L
authors.initials: L
authors.lastname: Safi
authors.forename: S
authors.initials: S
authors.lastname: Ravanshad
mesh_terms: D002648:Child; D005260:Female; D006801:Humans; D007180:Incisor; D019227:Tooth Apex / Q000254:growth & development*; D019553:Tooth, Nonvital / Q000503:physiopathology*