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This retrospective cross-sectional study has two-fold aims: the first is to assess new cut-offs at the legal age thresholds (LATs) of 14 and 16 years old and the second is to validate the cut-off of third molar index I3M=0.08 for 18 years of age in Chilean people. Orthopantomographs from 822 Chilean children aged from 11 to 22 (472 girls and 350 boys) were analysed. For LAT of 14 years, cut-offs were found using the ROC curves singly for boys and girls. The cut-offs for boys were I2M=0.16 and I3M=0.73 while for girls we obtained I2M=0.10 and I3M=0.77. For LAT of 16 years we obtained the same cut-offs regardless of gender, which were 0.06 and 0.36 for I2M and I3M respectively. Concerning the validity of I3M cut-off for 18 years old in Chilean population, the proportion of correctly classified individuals was 83% and estimated post-test probability, PPV, was 93.2%, with a 95% confidence interval equals to 91.3%, 94.6%. Hence, the probability that a subject positive on the test was 18 years of age or older was 93.2%, confirming the validation of the I3M cut-off for Chilean population. [ABSTRACT FROM AUTHOR]

This study aimed to assess the application of Cameriere's third molar maturity index (I3M) to select an individual of 18years or older (adult) from younger than 18years (minor) in a sample of Polish individuals. The final sample of 982 panoramic images aged between 15 to 24years was analyzed. The specific cut-off value of I3M<0.08 was analyzed. The specificity (Sp) and sensitivity (Se) for males were 91.2% and 86.2% respectively. The Sp and Se for females were 93% and 82.6% respectively. The probabilities of correctly classified individuals were 87.6% and 85.3%, and Bayes post-test probability was 96.3% and 97% in males and females respectively. Further analysis indicated the alternative cut-off value of I3M<0.07, which improved the specificity, 95.3%, and 94.7%, and worsen correct classification, 86.5%, and 84.4%, in males and females, respectively. Our results showed that the specific cut-off point of I3M<0.08 may be a useful tool for discriminating adults from minors in Poland. [ABSTRACT FROM AUTHOR]

This study aimed to assess the application of Cameriere's third molar maturity index (I 3M ) to select an individual of 18years or older (adult) from younger than 18years (minor) in a sample of Polish individuals. The final sample of 982 panoramic images aged between 15 to 24years was analyzed. The specific cut-off value of I 3M <0.08 was analyzed. The specificity (Sp) and sensitivity (Se) for males were 91.2% and 86.2% respectively. The Sp and Se for females were 93% and 82.6% respectively. The probabilities of correctly classified individuals were 87.6% and 85.3%, and Bayes post-test probability was 96.3% and 97% in males and females respectively. Further analysis indicated the alternative cut-off value of I 3M <0.07, which improved the specificity, 95.3%, and 94.7%, and worsen correct classification, 86.5%, and 84.4%, in males and females, respectively. Our results showed that the specific cut-off point of I 3M <0.08 may be a useful tool for discriminating adults from minors in Poland., (Copyright © 2018 Elsevier B.V. All rights reserved.)