3‑D Scanning Brings New Hope to Bite‑Mark Forensics

Bite marks can act like fingerprints, helping police link a suspect to a crime. Traditionally, experts look at photos and make measurements by eye—a process that can vary from one person to another. A new experiment tried a different route: using a 3‑D scanner and computer programs to compare bite marks on skin with models of teeth. The team used twelve full sets of dental molds, representing both upper and lower jaws. From these molds they created 24 bite marks on human skin in a lab setting. All the molds and the resulting marks were scanned with an iTero 3‑D device. The scans were then edited in MeshMixer software and matched against each other using CloudCompare.To test the method, researchers compared each bite mark to its own set of teeth and also to unrelated sets. They found that the shape and size patterns matched closely only when the correct teeth were used, while mismatched pairs showed clear differences. Interestingly, there was no noticeable difference between upper and lower jaws in the matching process. This experiment shows that digital 3‑D comparisons can tell apart matched from unmatched bite marks under controlled conditions. The data sets are also kept for future review, allowing other experts to examine the results later. While these findings are encouraging and point toward a more objective way of analyzing bite marks, the technique still needs further testing before it can be used in real court cases.