Publication: Three-dimensional superimposition analysis of occlusal surface of upper first premolar for human identification
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Date
2025-02
Authors
Radzi, Safa Mardiah Mohamed
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Abstract
Forensic dental identification using the comparative method relies on the unique features of dental structures to establish an individual’s identity. This study aimed to determine the reliability and uniqueness of the occlusal surface of the maxillary first premolar for human identification. A cross-sectional study was conducted using retrospective archived dental casts of Kelantanese Malays obtained from the Orthodontic Clinic of Hospital USM. A total of 90 dental casts were scanned into digital models using the Medit i500 intraoral scanner (Medit Corp, South Korea). The occlusal surfaces were isolated using 3-Matic software (Materialise NV, Belgium), and superimposition analysis was performed using CloudCompare software (CloudCompare, Paris, France). The intra-examiner and inter-examiner analyses on matched 18 pairs achieved a perfect agreement with a Cohen's Kappa value of 1.00, thus confirming 100% reliability for both tests. Under blind study conditions, only the Root Mean Square (RMS) values were used to distinguish between 45 matched and 45 unmatched pairs. The mean RMS for matched pairs was 0.011 ± 0.005 mm, while for unmatched pairs it was 0.219 ± 0.059 mm. The established RMS threshold of 0.1 mm correctly identified 100% of matched and unmatched pairs, with no overlap between the two groups (p < 0.05), hence confirming the uniqueness of the occlusal surface of the maxillary first premolar
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