Assessment of the uniqueness of human dentition.

Comparing ante-mortem and post-mortem dental characteristics has been a reliable, accurate and quick human identification method. This is based on the assumption that each individual's set of teeth is unique; however, there is little evidence to support this assumption. This research aimed to determine the uniqueness of basic dental features in a cohort of multinational dental patients. Dental charts were retrieved from the archives of the College of Dentistry at the University of Sharjah. Dental patterns were coded into letters representing basic dental characteristics, and entered into a computer program that was written specifically for analysing the results of this research. Two thousand dental charts were included in this research; the average age of the sample was 31.9 years (11-87 years). The male:female ratio was 1.4:1 from 55 nationalities. One thousand one hundred and fifty-nine dental charts (57.95%) had absolutely unique dental patterns. The remaining charts (n=841 [42.05%]) were found to have identical patterns with others, the most common of which was 'all virgin' teeth (n=482 [24.1%]). Introducing a single dental modification dropped this percentage to 1.05%. This percentage was further narrowed down to 0.7% when the gender variable was introduced to the comparison. The results of this research support the assumption that dental characteristics show a diversity that is useful for human identification, even when those characteristics are recorded in their simplest forms.