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A radiographic study of the mandibular third molar root development in different ethnic groups
H M Liversidge1, K Peariasamy2, M O Folayan3
1Institute of Dentistry, Queen Mary University of London, Barts and The London School of Medicine and Dentistry, London, United Kingdom.
The Journal of Forensic Odonto-Stomatology
|February 1, 2018
Summary
Dental development timing varies between ethnic groups, impacting age estimation. A Bayesian approach with a diverse dataset is crucial for accurate age assessment using mandibular third molars (M3).
Area of Science:
- Forensic Anthropology
- Dental Development
- Bioarchaeology
Background:
- Accurate age estimation is critical in forensic and anthropological studies.
- Understanding ethnic variations in tooth formation timing is essential for reliable age assessment.
Purpose of the Study:
- To determine the age of transition for mandibular third molar (M3) developmental stages.
- To analyze these transitions across diverse ethnic groups from Sub-Saharan Africa, Malaysia, Japan, and London (White and Bangladeshi).
Main Methods:
- Utilized 4555 dental radiographs (10-25 years old).
- Moorrees staging of left M3s.
- Probit modeling and Bayesian statistical approaches (AIC, BIC) to analyze age transitions and model fit.
Main Results:
- Significant differences in M3 root stage mean ages were observed among ethnic groups, though with large standard deviations.
- A separate statistical model for each ethnic group provided the best fit.
- Minor sex-based timing differences were noted, except in the Malaysian group.
Conclusions:
- Ethnic variations in M3 development timing exist but have limited impact on age estimation confidence intervals due to high individual variability.
- A comprehensive reference dataset and Bayesian statistical methods are superior to population-specific samples for individual age estimation.
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