title: Root resorptions related to ectopic and normal eruption of maxillary canine teeth - A 3D study.
abstract: OBJECTIVE
  To assess the incidence and severity of root resorption of maxillary incisors caused by ectopically and normally erupting maxillary canines and to analyse factors influencing root resorption of incisors using cone beam computed tomography.
  
  
  METHODS
  The study sample comprised 59 patients with a total of 80 canines. Forty-six of the canines, in 37 patients, were defined as ectopic and 34 canines, in 22 patients, were defined as normal. The severity of root resorptions were analysed according to studies by Ericson and Kurol. Multiple logistics regression was used to evaluate the association between various factors and root resorptions.
  
  
  RESULTS
  The prevalence of root resorptions was significantly higher in the ectopic canine group, 11.0% of the central incisors and 67.6% of the lateral incisors in comparison to 0% and 36.2% in the normal erupting group. Most resorptions were defined as 'slight' and were located in the middle third of the root. There was a statistically significant relationship between canines located mesial to the midline of the lateral incisor and root resorption on the maxillary incisors.
  
  
  CONCLUSIONS
  The present results show that root resorption of maxillary lateral incisors was common in patients referred to CBCT imaging due to maxillary canine eruption disturbances. Although significantly more frequent in patients with ectopically erupting canines, lateral incisor resorption was also found in association with approximately every third of the normally erupting canines. The best predictor for root resorption seemed to be location of the canine mesial in relation to the midline of the lateral incisor root.
authors.affiliation: Public Dental Service Competence Centre of Northern Norway , Tromso , Norway.
authors.forename: Sigurd
authors.initials: S
authors.lastname: Hadler-Olsen
authors.forename: Pertti
authors.initials: P
authors.lastname: Pirttiniemi
authors.forename: Heidi
authors.initials: H
authors.lastname: Kerosuo
authors.forename: Napat
authors.initials: N
authors.lastname: Bolstad Limchaichana
authors.forename: Paula
authors.initials: P
authors.lastname: Pesonen
authors.forename: Soili
authors.initials: S
authors.lastname: Kallio-Pulkkinen
authors.forename: Raija
authors.initials: R
authors.lastname: Lähdesmäki
mesh_terms: D000293:Adolescent; D002648:Child; D054893:Cone-Beam Computed Tomography / Q000379:methods*; D003481:Cuspid / Q000000981:diagnostic imaging*; D003724:Dental Arch / Q000000981:diagnostic imaging; D005260:Female; D005544:Forecasting; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D007180:Incisor / Q000000981:diagnostic imaging*; D008297:Male; D008437:Maxilla / Q000000981:diagnostic imaging; D009811:Odontometry / Q000379:methods; D012189:Retrospective Studies; D012391:Root Resorption / Q000209:etiology*; D014078:Tooth Eruption / Q000502:physiology*; D014079:Tooth Eruption, Ectopic / Q000150:complications*; D014092:Tooth Root / Q000000981:diagnostic imaging
keywords: Cone-beam computed tomography; tooth diseases; tooth eruption