Development and Validation of a Novel Device for Three-Dimensional Bite-Mark Analysis: An In-vitro Study
Keywords:
Bite mark analysis; Forensic odontology; Measurement accuracy; Three-dimensional imagingAbstract
Background: Bite mark analysis is a pivotal tool in forensic odontology, founded on the uniqueness of dental configurations. However, traditional photographic methods are increasingly criticized for subjectivity, distortion, and inter-observer variability, challenging their forensic credibility. Recent technological advancements have emphasized the need for standardized, three-dimensional approaches to improve the reliability of bite mark evidence.
Aim: The present study aimed to develop and validate a novel three-dimensional bite mark analysis device and compare its diagnostic accuracy, reliability, and efficiency against conventional photographic methods.
Materials and Methods: An in-vitro study was conducted using 60 bite mark specimens created on dental impression materials. Measurements were independently performed by two blinded forensic dental examiners using both the novel device and the photographic method. The novel device employed a vertical screw mechanism with an optical rotary encoder and dual-direction Persistence of Vision sensors to capture x, y, and z coordinates. Measurement accuracy, time taken, inter-observer reliability, sensitivity, specificity, and diagnostic performance were assessed and statistically analyzed.
Results: The novel device achieved significantly higher measurement accuracy (92.3%) compared to the photographic method (76.4%) (p < 0.001). The mean analysis time was reduced by nearly half with the novel device (6.8 minutes vs. 12.4 minutes, p < 0.001). Inter-observer reliability was greater with the device (kappa = 0.82) compared to photography (kappa = 0.65). Sensitivity, specificity, and area under curve values were also superior for the novel device.
Conclusion: The novel bite mark analysis device demonstrated superior precision, efficiency, and reproducibility over conventional methods, offering a promising tool for enhancing the scientific and legal admissibility of bite mark evidence.