Intelligence Quotient and Eruption Age of First Permanent Molar

Methods: Girls in age range of 60 to 78 months and boys in age range of 60 to 103 months, in Minoodar (Qazvin), were selected in three groups of early eruption, delay eruption and normal eruption with census method. A dentist examined the children’s mouths that have the necessary criteria in each coudrant by abslang under the day light for recording the eruption condition of first permanent molar tooth. Then all the examined children in standard and equal conditions were tested by intelligent Raven test. Then the studying groups were analyzed by the ANOVA, Tukey and Pearson tests.

Results: 176 boys and 169 girls were examined that all of these children were considered for Raven intelligent test.  From IQ point of view, there was no significant statistical difference between two groups of normal and early eruption. But there was IQ average difference in two groups which was statistically significant (P<0.05): early eruption with delay eruption and normal eruption with delay eruption.

Conclusions: Children that their first permanent molar teeth erupt with delay have lower intelligent quotient than the normal eruption and early eruption groups.