title: Lateral incisor root resorption and active orthodontic treatment in the early mixed dentition.
abstract: OBJECTIVE
  To evaluate the presence of root resorption in the lateral incisor after active orthodontic treatment in the early mixed dentition.
  
  
  METHODS
  Twenty-six children treated at the Children's Clinic of the Schulich School of Medicine and Dentistry at the University of Western Ontario were examined radiographically for lateral incisors root resorption before and after early active treatment to align upper incisors (2 x 4 appliance). In addition, canine inclinations to the midline and to the long axis of the lateral incisor as well as the most medial position of the canine crown were measured as potential risk factors for root resorption.
  
  
  RESULTS
  8% (4) of the lateral incisors exhibited root resorption and the mean crown-to-root ratio of these teeth was significantly higher than that for lateral incisors not exhibiting root resorption. Similarly, mean canine inclinations to the midline and to the long axis of the lateral incisor were also significantly higher for the root resorption group. No association could be found between the most medial position of the canine crown and root resorption in the lateral incisor.
  
  
  CONCLUSIONS
  This study showed that active orthodontic treatment in the early mixed dentition does not increase the risk for root resorption in the lateral incisors as long as the clinician takes into consideration canine inclinations and their potential effect on root resorption. Limitations inherent to radiographic assessment are acknowledged.
authors.affiliation: Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, Canada.
authors.forename: M S
authors.initials: MS
authors.lastname: Amlani
authors.forename: F
authors.initials: F
authors.lastname: Inocencio
authors.forename: S
authors.initials: S
authors.lastname: Hatibovic-Kofman
mesh_terms: D000293:Adolescent; D002648:Child; D003481:Cuspid / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D003818:Dentition, Mixed; D006801:Humans; D007180:Incisor / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D009811:Odontometry; D009971:Orthodontics, Corrective / Q000009:adverse effects; D011859:Radiography; D012391:Root Resorption / Q000000981:diagnostic imaging / Q000209:etiology*; D019228:Tooth Crown / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D014087:Tooth Movement Techniques / Q000009:adverse effects*