Survey of the time and order of eruption of permanent teeth of 4 to 14 years Torkman children in Gonbad Kavous City, 2003

Exfoliation of deciduous teeth and eruption of permanent teeth are an important stage for child’s parent and dentist. The purposes of this study are: 1) to determine the mean and range of the times and sequence of eruption of permanent teeth in Turkman children, 2) to determine the relationship between eruption of permanent teeth with age and gender. Method & Materials: In this analytical and cross-sectional study, 1365 (681 boys and 684 girls) 4-14 years old Turkman children from schools of Gonbad Kavoos City were selected randomly and examined. If a tooth was observed in oral cavity, it meant eruption. The time and sequence of eruption was recorded in a questionnaire. The data were analyzed by SPSS software and t test analysis. The first erupted-teeth were lower central incisors and first molars in girls and last erupted-teeth were upper second molars in boys. The sequence of eruption in girls was 6 1 2 4 3 5 7 61 2 3 4 5 7 and 6 1 2 4 5 3 7 61 2 4 3 5 7 in boys. Most of the lower permanent teeth erupted earlier than upper teeth only for the first premolars in boys, earlier eruption in upper jaw (than lower jaw) was statistically significant. Only for upper canines in girls, difference between mean eruption times in two sides of jaws was statistically significant. Most of the permanent teeth erupted earlier in girls than boys only for upper central incisors, earlier eruption in boys (than girls) was statistically significant. Permanent teeth in Turkman children erupt later than Lysell’s and Hurme’s standard tables. In Turkman children the median of eruption time in some teeth is more and in some teeth is less than Tehranian children and in some teeth is equal. Keywords: