Third molar mineralization in relation to chronologic age estimation of the Han in central southern China

Liu, Ying; Geng, Kun; Chu, Yan-Hao; Xu, Mindi; Zha, Lagabaiyila

doi:10.1007/s00414-018-1804-x

Cited by 15 publications

(8 citation statements)

References 25 publications

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“…Various methods based on physiological changes in teeth have been proposed for age estimation [7][8][9][10][11]. Mineralization of third molars was once used to determine whether a person is over 18 years of age, but third molars have been found to exhibit the greatest variations in crown-root mineralization timing, which not only varies among different ethnic groups, but also in different sexes and jaws.…”

Section: Introductionmentioning

confidence: 99%

Can canines alone be used for age estimation in Chinese individuals when applying the Kvaal method?

Zhao

Chen

et al. 2020

Forensic Sciences Research

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Due to the secondary dentin formation, the dental pulp undergoes changes in shape throughout life. Based on this phenomenon, the Kvaal method has been applied to various populations for age estimation, and its usefulness has been verified. When applying the Kvaal method to Chinese subjects, we observed a relatively strong correlation between mandibular canines and age. This study notes the correlation between canines and chronological age and is the first to identify which canine is most closely related to chronological age. In addition, a new, simpler formula is determined based on canines according to Kvaal's methodology. The radiographs of 360 individuals from northern China were selected, from which the widths and lengths of the pulp from four canines were measured according to the Kvaal method. Next, inter-and intra-observer reliabilities were analyzed in order to assess the repeatability of these measurements. The correlation between measurements and age was examined, and Chinese-specific age estimation formulae were derived. The results revealed that the ratios from the left maxillary canine exhibited the strongest correlation with age compared to the other canines, whereas the left mandibular canine showed the weakest correlation, which may contribute to the overall poor correlation of mandibular canines with age. What's more, the formula derived from the left maxillary canine in this study displayed the highest coefficients of determination, and the formula derived from all canines showed the lowest residuals. Both of these formulae performed better than the Chinese-specific formula derived from six different types of teeth in our previous study, which had formerly possessed the highest coefficients of determination and the lowest residuals. Thus, we concluded that canines do play an important role in age estimation in the Chinese population, and the correlation between maxillary canines and chronological age is stronger than that of mandibular canines, although no distinct trend as to which side is better correlated with age was established. Going forward, we recommend the analysis of additional samples from different geographical regions and populations to further verify the importance of canines in age estimation.

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Section: Introductionmentioning

confidence: 99%

Can canines alone be used for age estimation in Chinese individuals when applying the Kvaal method?

Zhao

Chen

et al. 2020

Forensic Sciences Research

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“…For the mineralization of the third molar (Teeth 28 and 38), the developmental process was divided into nine stages based on Demirjian’s morphological stage division method [ 16 ], and one stage was added for the appearance of third molar bud but without calcification, which was developed by other researchers [ 12 , 17 ].…”

Section: Methodsmentioning

confidence: 99%

“…Finally, we applied the third molar mineralization based on Demirjian’s morphological stage method to the Kvaal-specific equation in the training group samples and verified it in the testing group. At the same time, we added a published Chinese method [ 18 ] and a method developed by Demirjian’s stage division method [ 12 ] for comparison.…”

Section: Methodsmentioning

confidence: 99%

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Combining the third molar mineralization to further improve the accuracy of the Kvaal’s method in dental age estimation of subadults in northern China

Cai

Jiang

et al. 2023

Forensic Sciences Research

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The morphological changes based on deposition of secondary dentin and mineralization of the third molar have been proven to be related to chronological age. However, Kvaal’s method on the theory of deposition of secondary dentin was controversial with respect to dental age estimation in the recent research. The aim of this study was to combine parameters of Kvaal’s method with relatively high correlation coefficients and mineralization stages of the third molar to improve the accuracy of predicting the dental age of subadults in northern China. A total of 340 digital orthopantomograms of subadults aged from 15 to 21 years were analyzed. A training group was used to test the accuracy of the original Kvaal’s method and establish novel methods for subadults in northern China. A testing group was used to compare the accuracy of the newly established methods with the Kvaal’s original method and published method specifically used in northern China. To increase the feasibility of our estimation model, we combined the mineralization of the third molar to build a combined specific formula. The results showed that the combined specific model increased the coefficient of determination to 0.513 and the standard error of the estimate was reduced to 1.482 years. We concluded that the combined specific model based on deposition of secondary dentin and mineralization of the third molar could improve the accuracy of dental age assessment of subadults in northern China.

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“…Currently, the most commonly used methods are based on the analysis of skeletal remains but bones are subject to taphonomic processes and only have acceptable results in individuals in their early adulthood (4)(5)(6). Recently, numerous dental methods have been proposed for age estimation because unlike bones, teeth are much less affected by environmental or systemic factors such as drugs or endocrine problems.…”

Section: Introductionmentioning

confidence: 99%

Age Estimation in Iranian Population Using Tooth/Pulp Ratio in Mandibular Premolars by Panoramic Radiography

Dabbaghi

Kazemi

2020

Avicenna J Dent Res

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Background: Age estimation is a fundamental part of forensic science. Considering the fact that pulp size decreases throughout the life because of secondary dentine apposition, many researchers have used it as a method for age estimation with great results. This study aimed to determine the applicability of tooth to pulp ratio in mandibular second premolars in an Iranian population using panoramic radiographs. Methods: The sample consisted of 153 digital panoramic images of male and female Iranians aged 13-70 years, and the tooth to pulp ratio of both left and right mandibular second premolars was obtained using AutoCAD software. Analysis of variance (ANOVA), Pearson’s correlation, and regression analysis were used to analyze the data. A total of 20 images were reexamined after 30 days to test intra-observer error. Results: ANOVA test showed that gender had no effect on age estimation, and there was a significant correlation between age and tooth/pulp ratio (r=0.679 for right premolar, r=0.712 for left premolars, and r=0.736 for both premolars). Linear regression formulae were created based on the results and the mean differences between the estimated and actual age were reported to be 10.35±0.51, 9.17±0.54, and 8.83±0.52 for right, left, and both premolars, respectively. Intra-observer error showed no significant difference between repeated measurements. Conclusions: Tooth/pulp ratio of mandibular second premolars is a reliable and repeatable method for age estimation in Iranian population and using premolars of both sides yields the best results.

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Third molar mineralization in relation to chronologic age estimation of the Han in central southern China

Cited by 15 publications

References 25 publications

Can canines alone be used for age estimation in Chinese individuals when applying the Kvaal method?

Can canines alone be used for age estimation in Chinese individuals when applying the Kvaal method?

Combining the third molar mineralization to further improve the accuracy of the Kvaal’s method in dental age estimation of subadults in northern China

Age Estimation in Iranian Population Using Tooth/Pulp Ratio in Mandibular Premolars by Panoramic Radiography

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