Avulsion of primary teeth and sequelae on the permanent successors.

The purpose of the present study was to determine the frequency of avulsion of primary teeth and the location of the avulsed tooth in a representative population of Danish children. Also, the frequency and the type of developmental disturbances in the permanent successors were assessed and related to age at the time of injury. The material included dental records of 4238 children from three clinics in Municipal Dental Health Services near Copenhagen, Denmark. The children were born between 1 January 1983 and 31 December 2000. Thirty-five children (0.8%) were identified as having avulsed in all 44 primary teeth most frequently the maxillary incisors (89%). Thirty-three fully erupted permanent successors were included in the study, the prevalence of developmental disturbances was 30% (10 teeth). The results showed the risk of developmental disturbances in the permanent successors to be more frequent the younger the age at the time of injury (P = 0.04). Discolouration affected all 10 permanent teeth, but also hypoplasia and horizontal enamel hypoplasia were found.