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Three-dimensional analysis of bitemarks: A validation study using an intraoral scanner.
G Fournier1, F Savall2, A Galibourg1
1Faculté de Chirurgie Dentaire, Université Paul Sabatier, Centre Hospitalier Universitaire, Toulouse, France.
Forensic Science International
|February 25, 2020
Summary
Three-dimensional bitemark analysis using intraoral scanners shows high accuracy, especially with dental wax. Experience in odontology significantly impacts the reliability of bitemark analysis results.
Area of Science:
- Forensic Odontology
- Dental Technology
- Biomedical Imaging
Background:
- Three-dimensional (3D) bitemark analysis enhances accuracy.
- Intraoral scanners offer an alternative to traditional dental impressions for capturing bitemarks.
- Standardized protocols are needed for reliable 3D bitemark analysis.
Purpose of the Study:
- To assess the reproducibility and reliability of a 3D bitemark analysis protocol using an intraoral scanner.
- To evaluate the effectiveness of intraoral scanning for capturing bitemark data.
- To determine the influence of material type and observer experience on bitemark analysis accuracy.
Main Methods:
- Twenty-seven volunteers created bitemarks on dental wax, hard cheese, chocolate, and apple.
- Bitemarks and dentitions were scanned using a PlanMeca® Emerald intraoral scanner.
- Scans were analyzed using CloudCompare® software for 3D comparison and classification.
Main Results:
- Dental wax yielded the most accurate bitemark analysis results, while apple yielded the least.
- The rate of correct bitemark classifications was high, with rare misclassifications.
- Negative predictive values approached 100% across all observers; positive predictive values varied.
Conclusions:
- Intraoral scanners provide a reliable method for 3D bitemark analysis.
- The choice of material significantly affects analysis outcomes.
- Observer experience in odontology is crucial for accurate interpretation of bitemark evidence.
