Abstract
The completion of the third molar roots has played an important role in ascertaining whether individuals may be at or over a legal threshold of age, often taken as 18years. This study demonstrates that root apex completion in the third molar is relatively uninformative regarding the threshold of age 18years in a sample of 1184 males, where mean age-of-attainment of root apex completion for third mandibular molars is about 19.4years. This paper also considers the legal age threshold problem for cases where the third mandibular molar is not completely formed, and outlines the use of parametric models and Bayes' factors to evaluate dental evidence in statistically appropriate ways. It attempts to resolve confusion over age-within-stage versus age-of-attainment, likelihood ratios versus other diagnostic tests, and prior odds for a case versus the prior density for an age distribution.
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