Age estimation based on the volume change in the maxillary premolar crown using micro CT

Asami, Ruri; Aboshi, Hirofumi; Iwawaki, Atsushi; Ohtaka, Yusei; Odaka, Kento; Abe, Shinichi; Saka, Hideki

doi:10.1016/j.legalmed.2018.12.001

Cited by 19 publications

(26 citation statements)

References 18 publications

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“…It is generally accepted that teeth development is less influenced by environmental factors compared to the development of other anatomical features [17]. Hence, CA estimation methods involving OPG-based morphological dental parameters are the most popular CA estimation methods among diverse populations [30][31][32]. However, when applying these methods to populations that are different from the one used to develop the method, the results tend to show significant under-or overestimation of CA [33].…”

Section: Discussionmentioning

confidence: 99%

Application of Cameriere’s method for dental age estimation in children in South China

Yang

Wen

Xiao

et al. 2021

Forensic Sciences Research

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The aim of this study was to evaluate the applicability of Cameriere’s European formula for age estimation in children in South China and to adapt the formula to establish a more suitable formula for these children. Moreover, the performance of dental age estimation based on Cameriere’s method combining the developmental information of permanent teeth (PT) and third molar (TM) was also analysed. Orthopantomographs of 720 healthy children in Group A, and orthopantomographs of 320 children and 280 subadults in Group B were assessed. The samples of Group A were divided into training dataset 1 and test dataset 1, and the samples of Group B were also divided into training dataset 2 and test dataset 2. A South China-specific formula was established based on the training dataset 1, and the comparison of accuracy between the Cameriere’s European formula and the South China-specific formula was conducted with the test dataset 1. Additionally, a PT regression model, a TM regression model, and a combined regression model (PT + TM) were established based on the training dataset 2, and the performance of these three models were validated on the test dataset 2. The Cameriere’s European formula underestimated chronological age with a mean difference (ME) of −0.47 ± 1.11 years in males and −0.69 ± 1.19 years in females. However, the South China-specific formula underestimated chronological age, with a mean difference (ME) of −0.02 ± 0.71 years in males and −0.14 ± 0.73 years in females. Compared with PT model and TM model, the PT and TM combined model obtained the smallest root mean square error (RMSE) of 1.29 years in males and 0.93 years in females. In conclusion, the South China-specific formula was more suitable for assessing the dental age of children in South China, and the PT and TM combined model can improve the accuracy of dental age estimation in children. Key points Orthopantomographs of 720 healthy children in Group A, and orthopantomographs of 320 children and 280 subadults in Group B were assessed. A South China-specific formula was established based on the training dataset 1, and the comparison of accuracy between the Cameriere’s European formula and the South China-specific formula was conducted with the test dataset 1. A PT regression model, a TM regression model, and a combined regression model (PT + TM) were established based on the training dataset 2, and the performance of these three models were validated on the test dataset 2. The South China-specific formula was more suitable for assessing the dental age of children in South China, and the PT and TM combined model can improve the accuracy of dental age estimation in children.

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Section: Discussionmentioning

confidence: 99%

Application of Cameriere’s method for dental age estimation in children in South China

Yang

Wen

Xiao

et al. 2021

Forensic Sciences Research

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“…The images analyzed in most of the studies were from university/hospital archives or private dental clinics, the tooth being evaluated in situ, in other words, still present in living patients [2][3][4][5][6][7]15,16,[18][19][20][21][22][23]26,28,31,32 . A smaller number of studies used extracted teeth 1,14,17,25,27,29,30 , managing to achieve individual tooth image, and the study of Sakuma et al 24 stands out to use computed tomography took before forensic autopsy.…”

Section: Discussionmentioning

confidence: 99%

Three-Dimensional Radiological Methods for Age Estimation in Adults by Using the Pulp/Tooth Relation: an Integrative Review

Andrade¹,

Dezem²,

Souza³

et al. 2021

BJFS

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Assessment of secondary dentin apposition is an observable phenomenon widely used to estimate age. An integrative review was performed by searching the keywords "computed tomography AND age estimation AND pulp tooth volume ratio" and "microfocus x-ray AND age estimation AND pulp tooth volume ratio" in the electronic platforms Embase, PubMed, Scopus and Web of Science, in July 2020. Studies included: complete articles with age estimation from human teeth by use of computed tomography or micro-computed tomography, written in English, without time restriction. Excluded studies: not written in English or not in form of an article, clinical cases, literature reviews, if did not realize age estimations or if age estimation is done in animals teeth. The search resulted in 32 different articles. With application of the above criteria only 26 were reviewed. Data collected included: reference, year, country, tooth type, number of subjects, number of teeth, age group, image type, measuring instrument/software, type of analysis, coefficient of determination, correlation coefficient with age and accuracy. These data provided a quick global comparison of various methodologies that use the pulp/tooth relation, being practical for researchers and forensic team to which method they can use accordingly to a specific case and its expected accuracy.

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“…Nevertheless, the possibility of encroachment of site-specific depositions of secondary irregular dentin into the pulp tissue being one of the reasons cannot be excluded. Studies have revealed that the production of secondary dentin increases with age throughout an individual's entire lifespan and that a larger amount of secondary dentin is deposited on the floor of the pulp chamber and in the orifice of root canals than on the roof or side walls in multi-rooted teeth [15][16][17]. Accordingly, pulp chamber width decreases with an inflection point at 35-40 years of age, and the rate of the decrease becomes dramatic thereafter [18].…”

Section: Discussionmentioning

confidence: 99%

Variations in the configuration of pulp chambers subjacent to protostylids

et al. 2021

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This study aimed to clarify the positional relationship between the crown contour and pulp chamber of protostylids using three-dimensional reconstructed images. Methods: Fourteen molars with protostylids from Japanese subjects were subjected to micro-computed tomography. The external surface configurations of the teeth and pulp chambers were reconstructed. Hard tissue thicknesses in appointed buccal areas were measured on the reconstructed images. Results: Well-developed protostylids exhibited pulp-prominences above or at the cervical line level. Those that were moderately developed exhibited bulges of the pulp chamber subjacent to the protostylids. Ten of the 14 teeth had prominences in the crown pulp above or at the cervical line level. In addition, 13 teeth exhibited pulp chamber bulges surrounding the lower tooth trunk. No significant differences were apparent in the buccal horizontal thickness of the hard tissue between the protostylids with pulp chamber prominences and the protostylids without pulp chamber prominences at the cervical line level. Conclusion: Pulp chamber configurations subjacent to protostylids vary based on the development of the traits of the protostylids. Minimum possible taper should be applied during standard vital tooth preparations, as reduced residual dentin thickness is predicted in well-and moderately developed protostylids.

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Age estimation based on the volume change in the maxillary premolar crown using micro CT

Cited by 19 publications

References 18 publications

Application of Cameriere’s method for dental age estimation in children in South China

Application of Cameriere’s method for dental age estimation in children in South China

Three-Dimensional Radiological Methods for Age Estimation in Adults by Using the Pulp/Tooth Relation: an Integrative Review

Variations in the configuration of pulp chambers subjacent to protostylids

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