[The time periods for the formation of the permanent occlusion in children born and permanently living in a region close to a former nuclear test range].

The terms of eruption of permanent teeth were analyzed in 2000 subjects aged 3-19 years born and permanently living in a region adjacent to a former nuclear testing field in Kazakhstan. All groups of permanent teeth erupted sooner, and the rate of eruption was higher in girls than in boys. Except the 4th and 5th teeth, all groups of permanent teeth erupted sooner on the mandible than in the maxilla. The formation of occlusion was delayed in children born and living in the studied region in comparison with the children in central Russia and in the Extreme North. Eruption of some groups of teeth was delayed in older age groups. These data may be used at all pedodontics departments in organization of sanitation of children and in evaluation of the physical development and formation of orthodontic status of children.