Radiographic Survey of Third Molar Development in Relation to Chronological Age Among Japanese Juveniles

Abstract

The aim of the present study was to establish Japanese reference material on the third molar development of Japanese juveniles for forensic application. Observations were performed on the orthopantomograms of 1282 Japanese patients between the ages of 14.0 and 24.0 years. Demirjian formation stages of the maxillary and mandibular third molars were recorded for chronological evaluation of wisdom teeth and applied for further statistical analysis. Statistically significant differences were noted between the upper and lower jaws and genders. Accordingly, males achieved root developmental grades earlier than females. We assessed the mean ages for all formation grades and predicted the probability that a Japanese juvenile would be older than the relevant ages of 14, 16, and 20 as defined by Japanese Juvenile Law. We determined the likelihood that a Japanese youth is older than the relevant age of 18 as defined by legislation in the United States.

The Explore of Third Molar for Chronological Age Estimation in Teenagers of Shanghai Han Population

“…While our study shows that the relationship is higher in female than in male, the contrary result (r 2 in male=0.54, r 2 in female=0.45) is found by Prieto et al [8] There is high relationship (Table 5) between 18 and 28, 38 and 48 respectively, certified by other research [4,[8][9][10][11][12][13][14]. There is, however, no relationship between 18 and 48, 28 and 38.…”

Radiographic Evaluation of Developmental Stages of Third Molar in Relation to Chronological Age as Applicability in Forensic Age Estimation

“…It is observed that the number of cases lacking age documentation and the number of unidentified cadavers and the human remains are increasing. In view of this, the need for age estimation is increasing day by day [2][3][4][5][6].…”

“…Durability of dental structure makes it one of the materials of choice in age estimation as compare to skeletal method, which is influenced by exogenous factors [2,5,[7][8][9][10]. Tooth or dentition being the hardest structure in the body survives every disaster such as fire accidents, bomb blast, plane crashes, mass disasters etc [7,8,10].…”

“…Tooth or dentition being the hardest structure in the body survives every disaster such as fire accidents, bomb blast, plane crashes, mass disasters etc [7,8,10]. The multiple teeth in varied stage of dental development provide the sufficient data source for accurate age estimation, but only till the age of 14 years [2,11,12]. After the eruption of second permanent molar that is i. e. after 12-13 years of age the only teeth remain to develop is the third molar [13,14].…”

Estimating age and the likelihood of having attained 18 years of age using mandibular third molars

“…Design Methods were tested on a target sample of 300 dental panoramic radiographs (age [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Diagnostic accuracy was assessed on separate reference data (n = 1,663, age [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Root stage was the diagnostic test predicting 18 years of age.…”