Iranian Dental Association Journal of Iranian Dental Association 3060-8201 22 1 2010 08 01 Evaluation of intelligence quotient in children with early first permanent molar eruption 60 66 EN Bahman Seraj Mehdi Shahrabi Hoseain Afshar AQlireza Heydari Shahram Mosharafian Mohammad Fallah-Zadeh Eman Sanati Mahshid Shadfar Mohammad javad Kharazifard Journal Article 2010 06 23 2013 02 25 Â Evaluation of intelligence quotient in children with early first permanent molar eruption Â Â Dr. Seraj B .,1 Dr. Shahrabi M ., 2 Dr. Afshar H .2 Dr. Heydari A.,1 Dr. Mosharafian S.,1 Dr. Fallah-Zadeh M.,3 Dr. Sanati I.,4 Dr. Shadfar M.,4 Dr. Kharazifard MJ. 5 Â Â 1 Assistant professor, Department of Pediatric Dentistry , School of Dentistry, Tehran University / Medical Sciences. Tehran , Iran. 2 Associate professor, Department of Pediatric Dentistry , School of Dentistry, Tehran University / Medical Sciences. Tehran , Iran. 3 Assistant Professor, Department of Psychiatry, School of Medicine, Ghazvin University of Medical Sciences. Ghazvin, Iran. 4 Pediatric Dentist. 5 Dentist, Member Dental Research Center, Tehran University / Medical Sciences. Tehran, Iran. Â Â (Received 3 June, 2009 Accepted 22 May, 2010) Â Abstract Â Â Â Background and Aim : There are many unknown systemic and local factors influencing tooth growth and development. Likely, t ooth eruption may be under such influence as well. Despite delayed tooth eruption, studies on early tooth eruption are very scarce. Therefore, this study was conducted in order to evaluate the relationship between intelligence quotient (IQ) and early tooth eruption in normal children (with no disease or disorder). Â Materials and Methods : By using study criteria, 44 children were recruited after oral examination of 652 children (337 boys and 315 girls). Oral examination was conducted by one dentist using plastic disposable mirror, under day light. The Ravenâ€™s test was taken blindly under standard conditions for all subjects by a psychologist. â€œCaseâ€ subjects were defined as individuals who had partially or fully erupted molars earlier than the expected normal time. â€œControlâ€ subjects were similar to â€œcasesâ€ but without erupted molars. Statistical analysis was conducted using student T-test. Â Results : The intelligence test was performed on 44 subjects consisting of 22 boys (11â€caseâ€ and 11â€controlâ€) and 22 girls (11â€caseâ€ and 11â€controlâ€). IQ in two sexes did not have significant difference ( P<0.05 ). But the mean IQ difference between â€œcaseâ€ and â€œcontrolâ€ groups was about 11 points that was statically significant ( P<0.01 ). Â Conclusion : Healthy children with early first permanent molar eruptions, have higher IQ compared to their peers ( P<0.01 ). This criterion may be used to identify high IQ children for provision of special care and training for faster advancement of individual and society. Â Key words: Intelligence quotient (IQ) -Â Tooth eruption -Â First permanent molar -Â Children.Â Â Corresponding Author: Dr. Shahrabi M . , Associate Professor, Department of Pediatric Dentistry, School of Dentistry, Tehran University / Medical Sciences. Tehran, Iran. Â Â Â e.mail: mahdish99@yahoo.com Â