Applicability of Willems methods and Demirjian’s four teeth method for dental age estimation: Cross sectional study on Tunisian sub-adults

Nemsi, Hichem; Daya, Malek ben; Salem, Nidhal Haj; Masmoudi, Fatma; Bouanène, Inès; Maatouk, Fethi; Aissaoui, Abir; Chadly, Ali

doi:10.1016/j.forsciint.2018.08.007

Cited by 14 publications

(13 citation statements)

References 37 publications

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“…The radiographic evaluation of teeth mineralization and assessment of tooth eruption are the two main methods of CA estimation [4,5]. As the eruption of permanent teeth (PT) is easily affected by environmental factors, such as eating habits, nutrition status, local trauma, and persistence of deciduous teeth [3,6,7], recent studies of CA estimation based on radiographically observed that teeth mineralization has wider application in both forensic medicine and clinical oral medicine [8][9][10].…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…overestimation of chronological age was validated in a variety of counties or regions such as India [ 33 ],Turkey [ 34 ], Thailand [ 35 ], Spain [ 36 ],Kenya [ 37 ] and Poland [ 38 ]. Elsewhere, there were also reports of underestimation in north China [ 24 ], Tunisia [ 30 ], and Sri Lanka [ 39 ]. In allusion to the differences of the Willems I method among several regions, a systemic review, and meta-analysis we conducted previously concerning the Willems I method revealed the Willems method overestimated CA by 0.18 years and 0.06 years for boys and girls, respectively [ 4 ].…”

Section: Discussionmentioning

confidence: 99%

Comparative assessment of the Willems dental age estimation methods: a Chinese population-based radiographic study

et al. 2022

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Background The comparison of the two Willems dental age estimation methods (gender-specific (Willems I) and non-gender-specific (Willems II)) has not been fully investigated. Here we aimed to explore the applicability of the Willems dental age estimation in an Eastern Chinese population, which may cast light on the field of dental age estimation. Methods A total of 1211 oral panoramic radiographs (582 boys and 629 girls) of the Chinese Han population aged 11–16 years old were collected. Dental ages (DAs) were calculated using the Willems method. Statistical significance was set at a p-value < 0.05. Age differences between chronological age (CA) and dental age were analyzed by paired t-tests and mean absolute error (MAE). Results The differences between CA and DA determined by the Willems I method were + 0.44 and + 0.09 years for boys and girls, respectively. When using the Willems II method, these differences were + 0.57 and − 0.09. The MAEs of the Willems I method between DA and CA were 0.95 and 1.00 years in boys and girls, respectively. For Willems II, MAEs were 1.02 and 1.00 years in boys and girls. Conclusions This study showed that the Willems I method was more accurate than the Willems II method in the boys’ group for predicting age from a whole scale. In comparison, Willems II is more competitive in the girls' group. Neither method may be satisfactory for 11-to-16-year-old teenagers in Eastern China.

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“…Underestimations by Willems method was seen in some non-Indian populations [22,23,27,28,31,33] whereas a few more overestimated CA [12,14,[34][35][36][37][38].…”

Section: Discussionmentioning

confidence: 99%

Forensic Dental Age Estimation of North Indian Children Using Three Radiological Scoring Methods

Sankhyan

Sehrawat

Talwar

2022

AJFSFM

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Although believed to be reliable in children, dental age estimations have reportedly shown variations in their accuracy levels, indicating regional differences. The present paper aims to study the error threshold of the Nolla, Demirjian and Willems methods for age estimation of North Indian children. Digital orthopantomograms of 168 children aged 3-15 years were analyzed for the three methods. Demirjian dental age was found to be closest to the mean chronological age, as indicated by the p-value of paired t-test. The error range for the Willems and Demirijian methods was ±5 years with 87.5% of cases showing error within the range of ±2 years, and it was ±6 years with 84.5% of cases showing error within ±2 years using the Nolla method. The mean absolute error for the Nolla, Demirjian and Willems methods was 1.09, 1.10 and 0.97 years, respectively. The Willems method was better suited for dental age estimation of the studied population, though none of the methods precisely estimated the age of the participants. Wide variations in age estimates of varied population groups may be due to differences in statistical methods or genetic factors. Thus, comparison of the methods for different populations by the same researcher is suggested to reduce certain biasness (statistical methodology) in the study.

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Applicability of Willems methods and Demirjian’s four teeth method for dental age estimation: Cross sectional study on Tunisian sub-adults

Cited by 14 publications

References 37 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

Comparative assessment of the Willems dental age estimation methods: a Chinese population-based radiographic study

Forensic Dental Age Estimation of North Indian Children Using Three Radiological Scoring Methods

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