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Demirjian method and Willems method to study the dental age of adolescents in Shanghai before and after 10 years
Affiliations- Department of Orthodontics, Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Department of General Dentistry, Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
open access
Abstract
Background: The aim of this study was to assess whether the difference in dental
ages between 2009 to 2011 and 2021 is affected by environmental factors such
as environmental pollution, floating population, and dietary habits.
Materials and methods: Demirjian and Willems dental age estimation methods
were conducted for a Han population of children aged 8 to 14 in Shanghai, China.
A total of 1259 digital panoramic radiographs of children aged 8.00–14.99 were
estimated. All digital panoramic radiographs were estimated using the Demirjian
and Willems methods. Data collected in 2009 to 2011 and 2021 were statistically
analysed by paired t-tests.
Results: The results show that the Demirjian method overestimates 2009 to 2011
and underestimates 2021 the children’s chronological age. When using the Willems
method, the age of males was overestimated and the age of females was underestimated
from 2009 to 2011, and it was underestimated for both genders in 2021.
Conclusions: In conclusion, the difference in dental ages between 2009 to 2011
and 2021 was statistically significant. Factors such as environment and dietary
habits have been found to be affected by dental development. However, there
are disputes among some researchers about the exact factors, so it is suggested
to further study the effects of environmental factors on tooth development.
Abstract
Background: The aim of this study was to assess whether the difference in dental
ages between 2009 to 2011 and 2021 is affected by environmental factors such
as environmental pollution, floating population, and dietary habits.
Materials and methods: Demirjian and Willems dental age estimation methods
were conducted for a Han population of children aged 8 to 14 in Shanghai, China.
A total of 1259 digital panoramic radiographs of children aged 8.00–14.99 were
estimated. All digital panoramic radiographs were estimated using the Demirjian
and Willems methods. Data collected in 2009 to 2011 and 2021 were statistically
analysed by paired t-tests.
Results: The results show that the Demirjian method overestimates 2009 to 2011
and underestimates 2021 the children’s chronological age. When using the Willems
method, the age of males was overestimated and the age of females was underestimated
from 2009 to 2011, and it was underestimated for both genders in 2021.
Conclusions: In conclusion, the difference in dental ages between 2009 to 2011
and 2021 was statistically significant. Factors such as environment and dietary
habits have been found to be affected by dental development. However, there
are disputes among some researchers about the exact factors, so it is suggested
to further study the effects of environmental factors on tooth development.
Keywords
dental age estimation, environmental factors, Demirjian method, Willems method
About this articleTitle
Demirjian method and Willems method to study the dental age of adolescents in Shanghai before and after 10 years
Journal
Issue
Article type
Original article
Pages
346-358
Published online
2022-03-08
Page views
2287
Article views/downloads
770
DOI
Pubmed
Bibliographic record
Folia Morphol 2023;82(2):346-358.
Keywords
dental age estimation
environmental factors
Demirjian method
Willems method
Authors
K. Kwon
J. Pan
Y. Guo
Q. Ren
Z. Yang
J. Tao
F. Ji
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