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Leg Med (Tokyo). 2019 May;38:5-9. doi: 10.1016/j.legalmed.2019.03.001. Epub 2019 Mar 4.

Accuracy of the third molar index cut-off value for estimating 18 years of age: Validation in a Japanese samples.

Author information

1
Division of Forensic Odontology and Disaster Oral Medicine, Department of Forensic Science, Iwate Medical University, 2-1-1, Nishitokuta, Yahaba-cho, Shiwa-gun, Iwate 020-3694, Japan. Electronic address: kumagaia@iwate-med.ac.jp.
2
Division of Dental Radiology, Department of Reconstructive Oral and Maxillofacial Surgery, School of Dentistry, Iwate Medical University, 19-1, Uchimaru, Morioka, Iwate 020-08505, Japan.
3
AgEstimation Project, University of Macerata, Macerata, Italy.
4
AgEstimation Project, Macerata, Italy.
5
Center of Epidemiology, Biostatistics and Medical Information Technology, Department of Biomedical Sciences and Public Health, School of Medicine, Polytechnic University of Marche, 60126 Ancona, Italy.

Abstract

AIMS:

To evaluate the cut-off value of third molar maturity index (I3M) = 0.08 for discriminating minors from adults in Japanese population.

MATERIAL AND METHODS:

276 panoramic radiographs of healthy Japanese subjects (139 girls and 137 boys) age range from 14 to 24 years were evaluated.

RESULTS:

ICC (Intra-class correlation coefficient) for intra-rater and inter-rater agreement of I3M was 99.6% (95% CI 98.6-99.9%) and 98.9% (95% CI 98.8-99.9%) respectively. The proportion of correctly classified in girls was 87% (95% CI 81-93%) and in boys was 91% (95% CI 87-96%). The sensitivity of the test in girls and boys was 84% (95% CI 77-92%) and 89% (95% CI 83-95%) respectively and specificity was 93% (95% CI 85-100%) and 96% (95% CI 90-100%) in girls and in boys. The PPV (Positive Predictive Value) was 87% (95% CI 69-95%) in girls and 92% (95% CI 74-98%) in boys.

CONCLUSION:

The results of the study show that I3M is capable of discriminating adults and minors in subjects around legal age of 18 years old in Japanese population.

KEYWORDS:

Adult age; Dental age estimation; Forensic odontology; Japanese; Third molar maturity

PMID:
30878703
DOI:
10.1016/j.legalmed.2019.03.001
[Indexed for MEDLINE]

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