Articlediamond1998

Validity of the Demirjian method for dental age estimation when applied to Norwegian children

Roy Nykänen · Lisen Espeland · Sigrid Ingeborg Kvaal · Olaf Krogstad

193 citations0/0 files storedActa Odontologica Scandinavica

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Forensic Anthropology and Bioarchaeology Studies Orthodontics and Dentofacial Orthopedics Dental Radiography and Imaging

Abstract

Dental age was studied in a sample of 261 Norwegian children by using the maturity standards of Demirjian & Goldstein (1976) to examine the applicability of these standards as a reference for overall dental maturity in a Norwegian population. The sample comprised 128 boys and 133 girls included in 'the Oslo Growth Material', from whom orthopantomograms (total, 783) had been longitudinally obtained, with intervals of about 3 years and covering 3 age spans (5.5-6.5 years, 8.5-9.5 years, and 11.5-12.5 years), each divided into 3 half-year age groups. Reliability was analyzed by repeated assessments of 134 of the radiographs, and the overall mean difference between duplicate dental age determinations was 0.5 months for intra- and 1.8 months for inter-examiner comparisons. The Norwegian children were generally somewhat advanced in dental maturity compared with the French-Canadian reference sample. Among the boys the mean difference between dental age and chronologic age varied in the different age groups from 1.5 to 4.0 months. Among the girls the difference increased with age, varying from 0 to 3.5 months in the younger age groups (5.5 to 9.0 years) and from 4.5 to 7.5 months in the age groups 9.5 years and above. The variability in individual dental age was marked and increased with age. For the older age groups 95% of the individual age estimates were within +/-2 years of the real age. The applied standards appear to be adequate for studying dental age in groups of children from a Norwegian population. Given the considerable individual variation in dental maturity, estimation of chronologic age in individual children should be supplemented by other indicators of biologic maturity.

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References

1977The Measurement of Observer Agreement for Categorical Data 1960A Coefficient of Agreement for Nominal Scales 1973A new system of dental age assessment.1991Advances in dental anthropology 1976New systems for dental maturity based on seven and four teeth 1991Standards of human tooth formation and dental age assessment 1985Interrelationships among measures of somatic, skeletal, dental, and sexual maturity 1976Age of Attainment of Mineralization Stages of the Permanent Dentition

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2006The Bioarchaeology of Children 2008Comparison of two methods of dental age estimation in 7–15‐year‐old Malays 2006Timing of Demirjian's tooth formation stages 1999Dental maturation in British children: are Demirjian's standards applicable?2005Dental age in Dutch children 2020Deep Neural Networks for Chronological Age Estimation From OPG Images

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