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Age estimation based on MRI of the third molars: transferring 2D staging into 3D staging

Jannick De Tobel (UGent) , Elke Hillewig (UGent) and Koenraad Verstraete (UGent)
Author
Organization
Abstract
Purpose: To prospectively evaluate the use of 3T MRI of the third molars in age estimation. Materials and methods: In 52 healthy participants aged 14 – 26 years, MR images in three planes of all third molars were evaluated by two observers. In sixteen of them, MRI findings could be compared with findings on panoramic radiographs. Three staging methods were applied: Demirjian (1973), Köhler (1994) and Olze (2010). Results: The Olze method could not be applied, while both others could. In upper third molars the palatal root was considered decisive on MRI. In lower third molars this was the distal root. The majority of upper third molars (59.4%) was not assessable on panoramic radiograph, while all of them were on MRI. For assessable upper third molars the evaluation on radiography was more difficult than on MRI (P < 0.001). Lower third molars were assessable on both imaging techniques, with no difference in level of difficulty. Inter- and intra-observer agreement for evaluation was higher in MRI than in panoramic radiographs. In both imaging techniques lower third molars showed greater inter- and intra-observer agreement than upper third molars. MR images in the sagittal plane proved to be essential for staging. Axial and coronal images contributed to the staging only in a few cases, when the molar was tilted or when the apex was unclear on sagittal images. Conclusions: In age estimation, 3T MRI of third molars can be valuable. Some considerations are however necessary to transfer known staging methods to this 3D technique.
Keywords
panoramic radiograph, magnetic resonance imaging, third molars, age estimation, adolescent, young adult

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MLA
De Tobel, Jannick, Elke Hillewig, and Koenraad Verstraete. “Age Estimation Based on MRI of the Third Molars: Transferring 2D Staging into 3D Staging.” Age Estimation, Symposium Abstracts. Society for the Study of Human Biology (SSHB) ; British Association for Biological Anthropology and Osteoarchaeology (BABAO), 2014. Print.
APA
De Tobel, J., Hillewig, E., & Verstraete, K. (2014). Age estimation based on MRI of the third molars: transferring 2D staging into 3D staging. Age Estimation, Symposium abstracts. Presented at the Symposium on Age Estimation, Society for the Study of Human Biology (SSHB) ; British Association for Biological Anthropology and Osteoarchaeology (BABAO).
Chicago author-date
De Tobel, Jannick, Elke Hillewig, and Koenraad Verstraete. 2014. “Age Estimation Based on MRI of the Third Molars: Transferring 2D Staging into 3D Staging.” In Age Estimation, Symposium Abstracts. Society for the Study of Human Biology (SSHB) ; British Association for Biological Anthropology and Osteoarchaeology (BABAO).
Chicago author-date (all authors)
De Tobel, Jannick, Elke Hillewig, and Koenraad Verstraete. 2014. “Age Estimation Based on MRI of the Third Molars: Transferring 2D Staging into 3D Staging.” In Age Estimation, Symposium Abstracts. Society for the Study of Human Biology (SSHB) ; British Association for Biological Anthropology and Osteoarchaeology (BABAO).
Vancouver
1.
De Tobel J, Hillewig E, Verstraete K. Age estimation based on MRI of the third molars: transferring 2D staging into 3D staging. Age Estimation, Symposium abstracts. Society for the Study of Human Biology (SSHB) ; British Association for Biological Anthropology and Osteoarchaeology (BABAO); 2014.
IEEE
[1]
J. De Tobel, E. Hillewig, and K. Verstraete, “Age estimation based on MRI of the third molars: transferring 2D staging into 3D staging,” in Age Estimation, Symposium abstracts, Oxford, UK, 2014.
@inproceedings{5786240,
  abstract     = {Purpose: To prospectively evaluate the use of 3T MRI of the third molars in age estimation.
Materials and methods: In 52 healthy participants aged 14 – 26 years, MR images in three planes of all third molars were evaluated by two observers. In sixteen of them, MRI findings could be compared with findings on panoramic radiographs. Three staging methods were applied: Demirjian (1973), Köhler (1994) and Olze (2010).
Results: The Olze method could not be applied, while both others could. In upper third molars the palatal root was considered decisive on MRI. In lower third molars this was the distal root. The majority of upper third molars (59.4%) was not assessable on panoramic radiograph, while all of them were on MRI. For assessable upper third molars the evaluation on radiography was more difficult than on MRI (P < 0.001). Lower third molars were assessable on both imaging techniques, with no difference in level of difficulty. Inter- and intra-observer agreement for evaluation was higher in MRI than in panoramic radiographs. In both imaging techniques lower third molars showed greater inter- and intra-observer agreement than upper third molars. MR images in the sagittal plane proved to be essential for staging. Axial and coronal images contributed to the staging only in a few cases, when the molar was tilted or when the apex was unclear on sagittal images.
Conclusions: In age estimation, 3T MRI of third molars can 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},
  booktitle    = {Age Estimation, Symposium abstracts},
  keywords     = {panoramic radiograph,magnetic resonance imaging,third molars,age estimation,adolescent,young adult},
  language     = {eng},
  location     = {Oxford, UK},
  publisher    = {Society for the Study of Human Biology (SSHB) ; British Association for Biological Anthropology and Osteoarchaeology (BABAO)},
  title        = {Age estimation based on MRI of the third molars: transferring 2D staging into 3D staging},
  year         = {2014},
}