The teeth are the hardest structures in the body and can be a biomarker of aging. The aging process and degenerative changes in the teeth are helpful for estimation of age in adults. One of the best-known features of dental aging is a reduction in the size of the pulp chamber as a result of secondary deposition of dentin. In this study, we developed new regression models to estimate chronological age in Korean adults using the mandibular first molars to examine the relationship between age and pulp cavity size on intraoral radiographs. Intraoral periapical digital radiographs of the mandibular first molars were collected from 243 patients (147 male, 96 female) of known age. The radiographic images were analyzed by using the Adobe Photoshop CS5 image editing program. The pulp chamber height ratio (PCHR), pulp chamber width ratio (PCWR) were calculated and found to have a significant negative correlation with age. The correlation was consistently higher for PCHR than for PCWR. The strongest correlation was found for PCHR in female patients (r=−0.824). Multiple regression models were derived using the PCHR and PCWR. The determination coefficients (R²) of the models ranged from 0.660 to 0.730. Our results indicate that the measurement of pulp chamber height and width in the mandibular first molar is a practical, simple and reliable method for estimation of age in Korean adults.
Adult ; Age Determination by Teeth ; Aging ; Dental Pulp Cavity ; Dentin ; Female ; Humans ; Korea ; Male ; Methods ; Molar ; Radiography ; Tooth

There have been many radiographic studies on age estimation that evaluate reduction in size of dental pulp cavity with secondary dentin formation. The Paewinsky method reported high accuracy in estimating ages by measuring the width of the pulp cavity in panoramic radiographs. The aim of this study was to evaluate the application of the Paewinsky method to digital periapical radiographs. This study was conducted on 103 cases that reported to the Section of Human Identification of the National Forensic Service. The age was calculated by applying the Paewinsky method that measures the root and pulp canal width at three points in a tooth. The estimation results were compared with those calculated by the Johanson method. When the Paewinsky models were applied to digital periapical radiographs, the errors were significantly greater as compared to the original study. The errors of the maxillary second premolar and mandibular lateral incisor were greater than those of the maxillary central incisor, lateral incisor, mandibular canine, and first premolar. Furthermore, errors of the age estimation models in level C were greater than those in levels A and B. This study could be a reference for the application of the Paewinsky method to digital periapical radiographs.
Age Determination by Teeth ; Bicuspid ; Dental Pulp Cavity ; Dentin, Secondary ; Forensic Anthropology ; Incisor ; Methods ; Radiography, Dental ; Tooth

Age estimation is a hot and difficult issue in forensic practice. Teeth are the most solid organs in human body and can be kept in vitro for a long time. With age, the secondary dentin gradually generates and the volume of pulp cavity constantly decreases. Therefore, forensic dentists proposed that age-related changes of dentin-pulp complex could be used to estimate age, which has been widely applied in forensic practice over the years. Due to the development of imaging technology, a variety of methods have been advocated by forensic dentists to detect the age-related changes of dentin-pulp complex for age estimation. However, different methods have their own advantages and limitations, forensic scientists should combine the use of different methods for improving the accuracy of age estimation according to the actual situation. This paper reviews current research of age estimation based on dentin-pulp complex, so as to provide reference for related research.
Age Determination by Teeth ; Dental Pulp ; Dentin ; Forensic Dentistry/methods* ; Humans

Age estimation is important in the practice of forensic science to establish the identity of human remains, as well as with living persons. Particularly in Korea, age estimation in adults has been increase in the demand for incorrect birth records in order to be entitled to civil liability, social benefits, employment. The reduction of pulp cavity size as a result of secondary dentin deposit with increasing age could be used to estimate age. This regressive change can be analyzed using radiological techniques; thus, a variety of methods for dental age estimation based on this approach have been proposed. The purpose of this study is to evaluate the concurrence between the Drusini's method and the Jeon's method using the mandibular first molar on orthopantomographs (OPGs) in Korean adults. A total of 232 OPGs (91 females and 141 males) of Korean individuals with ages ranging from 20 to 69 years were analyzed using Drusini's method and Jeon's method. Our results revealed that the correlation of the two methods with age was statistically significant (r=0.501). Both Drusini's method and Jeon's method showed significant correlation with chronological age, and Jeon's method showed a greater correlation with chronological age (r=0.738) than Drusini's method (r=0.586). The mean absolute error was 7.99 years for Jeon's method and 9.79 years for Drusini's method. Our results demonstrate that Jeon's method using the mandibular first molar on OPGs is a practical and suitable method for age estimation in Korean adults.
Adult* ; Age Determination by Teeth ; Birth Certificates ; Dentin ; Dentin, Secondary ; Employment ; Female ; Forensic Sciences ; Humans ; Korea ; Methods* ; Molar* ; Radiography

Forensic dentistry is an interdiscipline of forensic medicine and stomatology, which provides legal information by collecting, testing and assessing the dental evidence scientifically. In this review, the present application of forensic dentistry has been described, such as the estimation of age, sex, species, occupation and living habit, as well as the identification of individual, domestic violence or abuse, which aims to enrich and improve forensic dentistry for making it be more useful in forensic medicine even in juridical practice.
Age Determination by Teeth ; Forensic Anthropology ; Forensic Dentistry/methods* ; Forensic Medicine ; Humans ; Tooth

OBJECTIVE: To explore the value of estimating chronologic age based on the grades of mandibular third molar development. To evaluate whether mandibular third molar could be used as an indicator for estimating the age under or over 18 years. METHODS: The mineralization status of mandibular third molar of 1 845 individuals aged 10 - 30 was graded and marked based on Demirjian's classification of grades reformed by Orhan. Gender difference was examined by t-test. A cubic regression model was established to analyze the correlation between third molar and chronologic age. Each grade of age cumulative distribution diagram and ROC curve was respectively performed to evaluate the relationship between third molar and the age of 18. Using Bayes discriminant analysis, an equation was established for estimating the age of 18. RESULTS: The inner-rater reliability was 0.903. Statistical analysis showed a moderate correlation between age and grade. Significant differences of both genders were found only in grade D and H (P < 0.05). Males at the grades from 1 to D and females at the grades from 1 to C were under 18 years old, and both males and females at grade H were over 18 years old. The area under the ROC curve was 0.797 (P < 0.05). CONCLUSION Third molar development shows a high correlation with age, and combined with other indicators, it can be used to estimate the age of 18.
Age Determination by Teeth/methods* ; Asian People ; Bayes Theorem ; China ; Female ; Forensic Dentistry ; Humans ; Male ; Molar, Third/diagnostic imaging* ; Radiography, Panoramic ; Reproducibility of Results ; Sex Characteristics

Teeth are the hardest organs in the human body. They are not easily affected by external physical and chemical factors to degrade or deform. Dental age assessment has been widely used in forensic practice. Dental image is one of the most common methods in the age estimation. The emergence of cone beam computed tomography (CBCT) technology provides a new way to obtain three-dimensional image of teeth. It has many advantages such as low-dose radiation, short-time scanning, high-precision image, and finical convenience. Recent development of CBCT technology and its application on age estimation are reviewed in this paper.
Age Determination by Teeth/methods* ; Cone-Beam Computed Tomography/trends* ; Humans ; Imaging, Three-Dimensional

OBJECTIVE: To study the applicability of Demirjian's method for age estimation in teenagers of Shanghai Han population in China. METHODS: Paired t-test was performed between the chronological age and the age determined by Demirjian's method of 501 teenagers whose orthopantomograms were collected from the ninth hospital of Shanghai. There were 168 boys and 333 girls involved in this study with chronological age from 11 to 20 years. Uni-factor model was used to explore the relationships of the two kinds of age. RESULTS: For the marked difference between the chronological age and determined age, Demirjian's method was not suitable to the Chinese Han adolescents. The results of paired t-test between chronological age and predicted age from quadratic equation showed that there was no significant difference in boys aged 12-16 years, in girls aged 12-14 years and 15-17 years repectively. The uni-factor model could make the error of determined age less than 1 year to 81.04% of the samples. CONCLUSION The age between 11 and 17 years can be well estimated by our method, except for the 17 years of age and above.
Adolescent ; Age Determination by Teeth/methods* ; Age Factors ; Asian People ; Child ; China/ethnology* ; Dentition, Permanent ; Female ; Forensic Dentistry/methods* ; Humans ; Male ; Models, Theoretical ; Radiography, Panoramic ; Reproducibility of Results ; Sex Factors ; Tooth/growth & development* ; Young Adult

The main methods of age estimation at present mostly rely on characteristic physical and chemical changes of skeleton, soft tissue, cells, biomacromolecules and the other substances. Because physiological changes of tissues and organs during growth are extremely complicated, all methods have their limitations. In practical, it is necessary to combine several methods together in order to improve the accuracy of age estimation. This article reviewed recent development on age estimation domestically and abroad and discussed advantage and disadvantage of different methods.
Age Determination by Skeleton ; Age Determination by Teeth ; DNA/genetics* ; Forensic Anthropology/methods* ; Humans

Dental age plays an important role in age estimation. It has often been used together with skeletal age to improve the accuracy of age estimation abroad, but seldom performed in China. As a noninvasive technology, dental radiological imaging has been widely used in age estimation. By observing the age-related changes such as the pulp cavity and development of crown and root on radiographs. Gleiser and Hunt, as well as Demirjian have developed different methods to determine the age of human. Demirjian's method has been proved to be more accurate but with limitation when used in persons of eighteen and above. The accuracy and reliability of the measurements on pulp cavity could be improved as the development of computed tomography with its high resolution and intelligent software. As a convenient and accurate method, age estimation from dental computed tomographs would be more promising in the future for forensic scientists and anthropologists.
Age Determination by Teeth/methods* ; Dental Pulp/diagnostic imaging* ; Forensic Dentistry ; Humans ; Radiography, Panoramic/methods* ; Tomography, X-Ray Computed/methods*