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Forensic age estimation based on magnetic resonance imaging of third molars : converting 2D staging into 3D staging

Jannick De Tobel UGent, Elke Hillewig and Koenraad Verstraete UGent (2017) ANNALS OF HUMAN BIOLOGY. 44(2). p.121-129
abstract
Background: Established methods to stage development of third molars for forensic age estimation are based on the evaluation of radiographs, which show a 2D projection. It has not been investigated whether these methods require any adjustments in order to apply them to stage third molars on magnetic resonance imaging (MRI), which shows 3D information. Aim: To prospectively study root stage assessment of third molars in age estimation using 3 Tesla MRI and to compare this with panoramic radiographs, in order to provide considerations for converting 2D staging into 3D staging and to determine the decisive root. Subjects and methods: All third molars were evaluated in 52 healthy participants aged 14-26 years using MRI in three planes. Three staging methods were investigated by two observers. In sixteen of the participants, MRI findings were compared with findings on panoramic radiographs. Results: Decisive roots were palatal in upper third molars and distal in lower third molars. Fifty-seven per cent of upper third molars were not assessable on the radiograph, while 96.9% were on MRI. Upper third molars were more difficult to evaluate on radiographs than on MRI (p <. 001). Lower third molars were equally assessable on both imaging techniques (93.8% MRI, 98.4% radiograph), with no difference in level of difficulty (p = .375). Inter- and intra-observer agreement for evaluation was higher in MRI than in radiographs. In both imaging techniques lower third molars showed greater inter- and intra-observer agreement compared to upper third molars. MR images in the sagittal plane proved to be essential for staging. Conclusion: In age estimation, 3T MRI of third molars could be valuable. Some considerations are, however, necessary to transfer known staging methods to this 3D technique.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
Third molar root, panoramic radiograph, surface head coil, sub-adult, COMPUTED-TOMOGRAPHY, LIVING INDIVIDUALS, CHRONOLOGICAL AGE, FOOTBALL PLAYERS, WISDOM TOOTH, MRI, POPULATION, EPIPHYSIS, TEETH
journal title
ANNALS OF HUMAN BIOLOGY
Ann. Hum. Biol.
volume
44
issue
2
pages
121 - 129
Web of Science type
Article
Web of Science id
000393818300006
ISSN
0301-4460
DOI
10.1080/03014460.2016.1223884
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
8049259
handle
http://hdl.handle.net/1854/LU-8049259
date created
2016-08-16 08:20:37
date last changed
2017-07-06 11:23:43
@article{8049259,
  abstract     = {Background: Established methods to stage development of third molars for forensic age estimation are based on the evaluation of radiographs, which show a 2D projection. It has not been investigated whether these methods require any adjustments in order to apply them to stage third molars on magnetic resonance imaging (MRI), which shows 3D information. 
Aim: To prospectively study root stage assessment of third molars in age estimation using 3 Tesla MRI and to compare this with panoramic radiographs, in order to provide considerations for converting 2D staging into 3D staging and to determine the decisive root. 
Subjects and methods: All third molars were evaluated in 52 healthy participants aged 14-26 years using MRI in three planes. Three staging methods were investigated by two observers. In sixteen of the participants, MRI findings were compared with findings on panoramic radiographs. 
Results: Decisive roots were palatal in upper third molars and distal in lower third molars. Fifty-seven per cent of upper third molars were not assessable on the radiograph, while 96.9\% were on MRI. Upper third molars were more difficult to evaluate on radiographs than on MRI (p {\textlangle}. 001). Lower third molars were equally assessable on both imaging techniques (93.8\% MRI, 98.4\% radiograph), with no difference in level of difficulty (p = .375). Inter- and intra-observer agreement for evaluation was higher in MRI than in radiographs. In both imaging techniques lower third molars showed greater inter- and intra-observer agreement compared to upper third molars. MR images in the sagittal plane proved to be essential for staging. 
Conclusion: In age estimation, 3T MRI of third molars could be valuable. Some considerations are, however, necessary to transfer known staging methods to this 3D technique.},
  author       = {De Tobel, Jannick and Hillewig, Elke and Verstraete, Koenraad},
  issn         = {0301-4460},
  journal      = {ANNALS OF HUMAN BIOLOGY},
  keyword      = {Third molar root,panoramic radiograph,surface head coil,sub-adult,COMPUTED-TOMOGRAPHY,LIVING INDIVIDUALS,CHRONOLOGICAL AGE,FOOTBALL PLAYERS,WISDOM TOOTH,MRI,POPULATION,EPIPHYSIS,TEETH},
  language     = {eng},
  number       = {2},
  pages        = {121--129},
  title        = {Forensic age estimation based on magnetic resonance imaging of third molars : converting 2D staging into 3D staging},
  url          = {http://dx.doi.org/10.1080/03014460.2016.1223884},
  volume       = {44},
  year         = {2017},
}

Chicago
De Tobel, Jannick, Elke Hillewig, and Koenraad Verstraete. 2017. “Forensic Age Estimation Based on Magnetic Resonance Imaging of Third Molars : Converting 2D Staging into 3D Staging.” Annals of Human Biology 44 (2): 121–129.
APA
De Tobel, J., Hillewig, E., & Verstraete, K. (2017). Forensic age estimation based on magnetic resonance imaging of third molars : converting 2D staging into 3D staging. ANNALS OF HUMAN BIOLOGY, 44(2), 121–129.
Vancouver
1.
De Tobel J, Hillewig E, Verstraete K. Forensic age estimation based on magnetic resonance imaging of third molars : converting 2D staging into 3D staging. ANNALS OF HUMAN BIOLOGY. 2017;44(2):121–9.
MLA
De Tobel, Jannick, Elke Hillewig, and Koenraad Verstraete. “Forensic Age Estimation Based on Magnetic Resonance Imaging of Third Molars : Converting 2D Staging into 3D Staging.” ANNALS OF HUMAN BIOLOGY 44.2 (2017): 121–129. Print.