[Genetic studies in patients with trisomy 21 with special evaluation of morphology and pathogenesis in the orofacial region. Condition of periodontal and oral hygiene in trisomy 21].

The incidence and severity of parodontopathies and results of studies of the level of oral hygiene are reported, in terms of both subjective and objective parameters, for children and juveniles affected with trisomy 21. Also discussed are problems of age and sex dependence; causal, complementary, and reciprocal relationships; and possibilities of prophylaxis.