title: Odontogenic tumours, a collaborative retrospective study of 75 cases covering more than 25 years from Estonia.
abstract: BACKGROUND
  The aim of the present collaborative study was to analyse retrospectively the character of odontogenic tumours in Estonia, involving the entire Estonian population (1.4 million), and to compare their prevalence with the figures presented in similar reports from other countries.
  
  
  METHODS
  All material for the retrospective study was retrieved from the files of the Departments of Maxillofacial Surgery in Tartu and Tallinn, Estonia, where all in/out-patients are treated from the whole country. The final diagnosis in each case of odontogenic tumour was based on the 1992 WHO histological criteria.
  
  
  RESULTS
  A total of 75 odontogenic tumours was found, 74 (98.6%) of which were benign, and 1 (1.3%) was malignant. The frequency of odontogenic tumours in this study was the lowest ever reported. The most common tumours were odontoma (34.3%), followed by ameloblastoma with different subtypes (25.3%), ameloblastic fibroma (16%), odontogenic myxoma (12%) and benign cementoblastoma (8%).
  
  
  CONCLUSIONS
  Odontogenic tumours are relatively rare in Estonia compared with the data from other countries.
authors.affiliation: Department of Maxillofacial Surgery, University of Tartu, Tartu 51014, Estonia. tiia.tamme@klinikum.ee
authors.forename: Tiia
authors.initials: T
authors.lastname: Tamme
authors.forename: Marianne
authors.initials: M
authors.lastname: Soots
authors.forename: Andres
authors.initials: A
authors.lastname: Kulla
authors.forename: Kert
authors.initials: K
authors.lastname: Karu
authors.forename: Siiri-Mai
authors.initials: SM
authors.lastname: Hanstein
authors.forename: Airi
authors.initials: A
authors.lastname: Sokk
authors.forename: Enn
authors.initials: E
authors.lastname: Jõeste
authors.forename: Edvitar
authors.initials: E
authors.lastname: Leibur
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000564:Ameloblastoma / Q000453:epidemiology; D002648:Child; D004957:Estonia / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D008339:Mandibular Neoplasms / Q000453:epidemiology; D008441:Maxillary Neoplasms / Q000453:epidemiology; D008875:Middle Aged; D009808:Odontogenic Tumors / Q000145:classification / Q000453:epidemiology*; D009810:Odontoma / Q000453:epidemiology; D015995:Prevalence; D012189:Retrospective Studies; D012737:Sex Factors