Age estimation based on Willems method versus new country-specific method in South African black children
The aims of our study were to develop new maturity scores for dental age estimation in South African black children according to the Willems method, which was developed based on Belgian Caucasian (BC) reference data (Willems et al. J Forensic Sci 46(4):893–895, 2001), and to compare age prediction performance of both methods.
Subjects and methods
A total of 986 panoramic radiographs of healthy South African black (SAB) children (493 males and 493 females) in the age range of 4.14 to 14.99 years (mean age 10.06 years) were selected for obtaining developmental staging scores (according to Demirjian et al. Hum Biol 45(2):211–227, 1973). Willems BC methodology was applied to develop new country-specific maturity scores (Willems SAB). Age prediction performance of Willems BC and Willems SAB was compared.
On average, Willems BC renders acceptable results with an overestimation of chronological age of 0.06 years (SD 0.88 years) in SAB children. Compared to Willems SAB, the overall mean absolute error was slightly higher with Willems BC (0.62 and 0.68 years, respectively), but this was not significant in males. Also, the root mean squared error was marginally higher in Willems BC.
The new age prediction method developed in South African black children was found to be better compared to Willems BC, although the difference seems to be small and clinically not relevant, especially in males.
KeywordsAge determination by teeth Child South Africa
Compliance with ethical standards
Ethical approval was granted by the Faculty of Health Sciences Research Ethics Committee, University of Pretoria (number 122/2014 20.06.2014).
- 3.Solheim T (1993) Dental age-related regressive changes and a new method for calculating the age of an individual. PhD ThesisGoogle Scholar
- 4.Greulich WW, Pyle SI (1959) Radiographic atlas of skeletal development of the hand and wrist. Standford University Press, StanfordGoogle Scholar
- 5.Tanner JM, Whitehouse RH, Marshall WA, Healy MJR, Goldstein H (1975) Assessment of skeletal maturity and prediction of adult height (TW2 method). Academic Press, LondonGoogle Scholar
- 15.Galic I, Vodanovic M, Cameriere R, Nakas E, Galic E, Selimovic E, Brkic H (2011) Accuracy of Cameriere, Haavikko, and Willems radiographic methods on age estimation on Bosnian-Herzegovian children age groups 6-13. Int J Legal Med 125(2):315–321. https://doi.org/10.1007/s00414-010-0515-8 CrossRefPubMedGoogle Scholar
- 18.Ambarkova V, Galic I, Vodanovic M, Biocina-Lukenda D, Brkic H (2014) Dental age estimation using Demirjian and Willems methods: cross sectional study on children from the Former Yugoslav Republic of Macedonia. Forensic Sci Int 234:187 e181–187 e187. https://doi.org/10.1016/j.forsciint.2013.10.024 CrossRefGoogle Scholar
- 24.Thevissen PW, Fieuws S, Willems G (2010) Human dental age estimation using third molar developmental stages: does a Bayesian approach outperform regression models to discriminate between juveniles and adults? Int J Legal Med 124(1):35–42. https://doi.org/10.1007/s00414-009-0329-8 CrossRefPubMedGoogle Scholar
- 26.Fieuws S, Willems G, Larsen-Tangmose S, Lynnerup N, Boldsen J, Thevissen P (2016) Obtaining appropriate interval estimates for age when multiple indicators are used: evaluation of an ad-hoc procedure. Int J Legal Med 130(2):489–499. https://doi.org/10.1007/s00414-015-1200-8 CrossRefPubMedGoogle Scholar
- 34.Thevissen PW, Alqerban A, Asaumi J, Kahveci F, Kaur J, Kim YK, Pittayapat P, Van Vlierberghe M, Zhang Y, Fieuws S, Willems G (2010) Human dental age estimation using third molar developmental stages: accuracy of age predictions not using country specific information. Forensic Sci Int 201(1–3):106–111. https://doi.org/10.1016/j.forsciint.2010.04.040 CrossRefPubMedGoogle Scholar
- 40.Elamin F, Hector MP, Liversidge HM (2016) The timing of mandibular tooth formation in two African groups. Ann Hum Biol 1–12. https://doi.org/10.1080/03014460.2016.1213313