Radiographic evaluation of dental age using Demirjian's eight-teeth method and its comparison with Indian formulas in South Indian population

The study was conducted to evaluate the applicability of Demirjian method and its comparison with Indian formulas for estimation of dental age in subjects attending a dental school in South India. A total of 250 individuals (130 males and 120 females) between 7 and 18 years, with orthopantamographs were included in the study. Chronological age was recorded based on subject's date of birth. Dental age was estimated using Demirjian's and Indian formulas. All the data obtained was entered into spreadsheet and subjected to statistical analysis. The mean chronological age of the study sample was 12.39 ± 3.32 years; while the mean age obtained from Demirjian's method and Indian-specific regression formula were 11.56 ± 3.17 years and 14.20 ± 3.24 years, respectively. In the present study, the Demirjian's method under estimated dental age by 0.84 years in males and 0.83 years in females (P < 0.05). Indian-specific regression formulas overestimated dental age by 1.72 years in males and 1.91 years in females (P < 0.05). The published Demirjian's and Indian-specific regression formulas are not applicable to the present study group. Hence population-specific cubic regression formulas were developed for males and females in Bhimavaram town (South India).