According to Angle, there are three main oculusal relationships (class I, class II, class III). The aim of this research was to establish the frequency of occlusal relationships in seven years old children from the center of Nis City and to define sexual dimorphism. Material and methods. The investigation included 551 child (285 girls and 266 boys) from 2145 seven years old children altogether, that is 26,69%. Within medical inspection of children of first class of primary school, there were analized the existence of Class I, II and III, regarding canines and first permanent molars. Result and discussion. Clas I exists in majority of patients - 65.30% (63.5% boys and 67% girls), class II exists in 29.2% (30.4% boys and 28% girls), while class III exists in 5.5% of patients. Conclusion. Seven years old children mostly have class I occlusal relationship, than class II and class III can be seen very rarely. .
