title: Investigation of the maxillary lateral incisor agenesis and associated dental anomalies in an orthodontic patient population.
abstract: OBJECTIVE
  The aim of this study was to investigate the prevalence of maxillary lateral incisor (MLI) agenesis and associated dental anomalies as well as skeletal patterns in an orthodontic population, and then to compare it with the prevalence of these anomalies in the general population.
  
  
  METHODS
  The material of the present study included the records of the 3872 orthodontic patients. The followings were recorded for each subject with the agenesis of MLI: Age, sex, unilateral or bilateral absence, anterior-posterior skeletal relationship of the maxilla and mandible, and presence of associated dental anomalies. The occurrence of these anomalies was compared with data previously reported for the general populations.
  
  
  RESULTS
  Of the 3872 patients examined, 94 were found to have agenesis of the MLI, representing a prevalence of 2.4 per cent, with females being more frequently observed. The most commonly found associated anomalies were ectopic eruption of maxillary canines and reduced or peg- shaped contralateral incisor with the frequencies of 21.3 per cent and 20.2 per cent respectively.
  
  
  CONCLUSIONS
  Patients with agenesis of MLI showed a significantly higher prevalence of skeletal Class III malocclusion compared with the general population. The prevalence of ectopic eruption, transposition, and transmigration of the maxillary canine and reduced or peg- shaped MLIs were significantly increased.
authors.affiliation: Department of Orthodontics, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey. mevlutcelikoglu@hotmail.com
authors.forename: Mevlut
authors.initials: M
authors.lastname: Celikoglu
authors.forename: Hasan
authors.initials: H
authors.lastname: Kamak
authors.forename: Hanifi
authors.initials: H
authors.lastname: Yildirim
authors.forename: Ismail
authors.initials: I
authors.lastname: Ceylan
mesh_terms: D000015:Abnormalities, Multiple / Q000453:epidemiology*; D000293:Adolescent; D000328:Adult; D002648:Child; D005260:Female; D006801:Humans; D007180:Incisor / Q000002:abnormalities*; D008297:Male; D008310:Malocclusion / Q000453:epidemiology; D008437:Maxilla; D009970:Orthodontics; D015995:Prevalence; D014071:Tooth Abnormalities / Q000453:epidemiology*; D055815:Young Adult