Orthopantomography and Age Determination Using Third Molar Mineralization in A Sample of Egyptians

Abstract

In the last decade, the number of unidentified cadavers and cases lacking age documentation and therefore requiring age determination has increased. Dental age determination still represents today the most sensitive mean. In the age span of 15-26 years of age the wisdom teeth represent the only teeth still in development and thereby very important for dental age assessment. So, the aim of the present investigation was to detect the chronological age of an individual based on the dental developmental stages of third molars proposed by Demirjian et al. (1973). In this study 380 orthopantomograms of Egyptian patients (214 males and 166 females) with known age and sex were selected for the study. Patients' age ranged from 8 to 26 years. X rays were examined by the second author (N.A.A.), the developmental stage of third molars in both upper and lower arches were detected using method of Demirjian et al. (1973). Data were gathered and SPSS was used for statistical processing. The mean values and standard deviation (SD+) were determined for the ages of respective mineralization stages of each of the four wisdom teeth. Further statistical analysis was performed in order to obtain multiple regression formulae for dental age calculation. The results showed that the mean age at early developmental stages (A-D) was lower in males than in females in all wisdom teeth .On the other hand, the stages from E-G there was earlier development in females in maxillary molars but it was earlier in males in mandibular molars. The full eruption of third molar (H stage) was earlier in females in the four molars. The greatest correlation coefficient was found between the developmental stages of maxillary molars in females. A strong correlation was found between lower right and lower left molar in females, a similar correlation was found between upper left and lower left third molars in females. The lower correlation coefficient was noticed between antimeres such as upper right and lower right in males. The probability of an individual being older than 18 years in case of fully developed wisdom was 100% in females when one molar or more were found but it was 66.7% in males when one molar is present and 100% when two or more molars were present. Regression analysis was performed in order to obtain regression formulae for dental age prediction.

Radiological age estimation using third molars mineralization in a sample attending orthodontic clinics (A retrospective study)

“…(24) Regarding gender differences in this stage, the mandibular third molars in females began stage H at 20.9 years which was earlier than males in contrast to Sujatha et al (17) who reported that males reached this stage earlier than females. Khosronejad et al (18) and Hassan and Abo Hamilla (25) supported the findings of the current study when the Iranian females reached certain third molar mineralization stages (only the H stage) sooner than males and in Egyptian females, all third molars reached H stage earlier than males. It becomes clear from the mean ages in both arches that at stages A-F, the subjects were probably below 18 and at stage G and H, the individuals were above 18 years; this comes in agreement with Jung and Cho (22) who reported that Korean population exhibited stage G at age of 18 years or older, and Khosronejad et al (18) who found that both G and H stages could indicate that the person might be above 18 years old.…”

Relación entre la edad cronológica y la mineralización del tercer molar inferior según método de Demirjian

“…Algunos estudios van enfocados principalmente a estimar la mayoría de edad, entonces sus muestras se encuentra aproximadamente en el rango entre los 14 y 25 años (2,12,14,17,19,22,23,25,26,30,32). Otros registran desde los inicios de la mineralización del tercer molar, por lo que el límite inferior se encuentra aproximadamente a los siete años de edad (16,20,21,24,27,29,32) (Tabla 5).…”

“…En gran parte de los países, los 18 años marca la edad adulta o mayoría de edad y las implicancias legales cambian signifi cativamente, es por ello que recientemente, la cronología del desarrollo del tercer molar se ha utilizado para juzgar si una persona es un menor de edad o un adulto (17,19,22). Es importante mencionar que varios estudios han indicado que existen variaciones de acuerdo al grupo poblacional, país o etnia (12)(13)(14)(15)(16)(17)(18)(19)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32).…”

Neuromandibular integration in humans and chimpanzees: Implications for dental and mandibular reduction inHomo

“…The specimens belong to dental adult individuals of known sex. Full eruption of the third molar was used to estimate age class (Bolter and Zihlman, ; Hassan and Mansoura, ). The specimens of P. troglodytes are available from the online database of the Primate Research Institute at Kyoto University (KUPRI, Kyoto, Japan), from the primate skeletal collection of the National Museum of Natural History (NMNH, Washington, US), from the Senckenberg Research Institute (Frankfurt, Germany), and from the online database Morphosource (http://www.morphosource.org) at Duke University (Durham, US).…”