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

Abstract

Aim: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.Materials and Methods: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.Results: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).Conclusion: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).

Validation of third molar maturity index (I 3M ) for discrimination of juvenile/adult status in South Indian population

“…Age estimation using teeth was studied in India widely [65][66][67][68] . Recently, a study was conducted on South Indian children, where in which the author has tested the accuracy of three age estimation methods 65 .…”

Age estimation of teenagers from Monterrey (Mexico) by the evaluation of dental mineralization after multi-slice helical computed tomography

“…This was an observational, cross-sectional, and analytical study, which evaluated teenagers and adolescents (age [14][15][16][17][18][19][20][21][22], with residency in the metropolitan area of Monterrey (Nuevo Leon, Mexico), of either gender, and who had at least one third molar formed. Monterrey is a cosmopolitan city in north-eastern Mexico, with over 4 million inhabitants.…”

Gambaran Estimasi Usia Biologis dengan Menggunakan Metode Blenkin-Taylor (Modifikasi Sistem Demirjian) di Kota Semarang

“…Adanya underestimation maupun overestimation dalam penelitian estimasi usia dipengaruhi oleh faktor genetik, lingkungan, nutrisi, serta besar populasi. 13 Berbeda halnya dengan penelitian oleh Kiran et al 14 terhadap 130 laki-laki dan 120 perempuan di India dengan menggunakan metode Demirjian. Hasil penelitian tersebut mendapatkan overestimation 1,72 tahun untuk laki-laki dan 1,91 tahun pada perempuan.…”

“…Hasil kedua penelitian tersebut menunjukkan bahwa metode Blenkin-Taylor dapat diaplikasikan di Indonesia, khususnya pada usia anak 5-15 tahun, dengan penyesuaian pada rumus perhitungan estimasi usia sesuai kurva regresi ras. 14,15 Kendala dalam penelitian ini yaitu kesulitan memperoleh radiograf dengan kualitas mutu radiograf panoramik yang baik atau excellent. Kontras yang kurang baik menyulitkan peneliti untuk melakukan penilaian pada apeks gigi.…”