TRAUMATIC INJURIES TO UPPER PERMANENT INCISORS RELATED TO AGE AND INCISAL OVERJET - RETROSPECTIVE STUDY

The relationship between traumatic injuries to upper permanent incisors and incisal overjet, with special reference to the age at which the trauma occurred, was studied in a sample of 1437 orthodontically untreated children aged 7-16 years. Traumatic injuries to hard dental tissues and exarticulations of teeth were recorded. Before 10 years of age, the increase of the prevalence rates was most rapid in the extreme (> 6 mm) overjet group in both sexes; the ratios between the extreme and normal (0-3 mm) overjet groups being 6.5/1 in girls and 5.0/1 in boys. According to the estimate, about 50 % of the girls and 70 % of the boys in this overjet group with injuries were affected before the age of 10 years. © 1979 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted.