The paper presents details about the occurrence of caries on different surfaces of permanent teeth in childern of elementary schools in the city of Zagreb.The group consisted of 942 children 7 to 15 years old which were examined, about the same member of them from the single grades, in order to obtain equal subgroups at the same age. The results show undoubtedly that the occlusal and cervical surfaces of the first permanent molars are those which are the most frequently affected. Trying to explain this the authors come to the conclusion that such an order of caries incidence on the particular surfaces might be associated with the time of eruption of the teeth, with the time of persistance of different deciduous teeth in the mouth., with the shape of the teeth and with oral hygiene.
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