Akiko Kumagai1, Noriaki Takahashi2, Luz Andrea Velandia Palacio3, Agnese Giampieri4, Luigi Ferrante5, Roberto Cameriere4. 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.
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.