The prevalence and severity of periodontal disease were determined in a group of individuals with Down's syndrome and a group of their selected siblings. Prevalence and severity of the disease were measured by the PI of Russell and were greatest in the children with Down's syndrome--more than threefold greater. The siblings demonstrated an experience not unlike that of the US population.

No abstract

No abstract

The accumulated posteruptive tooth age was calculated for 212 children with Down's syndrome and 124 of their unaffected sibs. Posteruptive tooth age was shown to vary widely with different morphological permanent tooth types at the same chronological age. Girls in both groups had greater accumulated posteruptive tooth age than boys at each age. Sibs of both sexes generally exceeded the exposure experience of the children with Down's syndrome.

Eruption constants for the permanent dentition were determined in 212 mongoloid children and 124 of their unaffected sibs. Eruption of the permanent teeth in sibs was like that of other normal children. Mongoloid children resembled their sibs in general characteristics of tooth eruption, but showed a consistent tendency toward later mean ages of eruption for each tooth type.