Morphometric and radioisotopic analysis of an adult mandibular bone fragment found together with anatomical forceps and two scalpel blades

BACKGROUND: During excavation works for high-speed railway infrastructure in central Italy, at a depth of 430 cm in clayey-gravelly soil, a mandibular bone fragment was discovered together with metal artefacts. The find emerged in the context of geotechnical stabilization works aimed at ensuring ground support for the railway line. METHODS: The mandibular fragment, preserved with erupted teeth, was cleaned and analyzed by radiological tomography using software for morphometric and densitometric evaluation. A subsample was examined at a Nuclear Physics Centre for radioisotopic dating and to assess the individual's physical and nutritional status at the time of death. Comparative archaeological analyses were performed to identify the nature and chronology of the associated metal artefacts. RESULTS: Morphometric assessment confirmed the remains belonged to an adult primate of the Order Eutheria, with traits consistent with a human specimen. Radiological and isotopic studies yielded data on bone density, preservation, and temporal context. The artefacts displayed distinct morphological features attributable to manufactured tools. Archaeological comparison indicated they were most likely the tips of surgical instruments, dating to the Roman period (first century AD). CONCLUSIONS: This multidisciplinary investigation demonstrates the value of combining morphometric, radiological, radioisotopic, and archaeological analyses in reconstructing the biological and cultural significance of osteological finds. The evidence suggests the mandibular fragment belonged to an adult individual, and the associated artefacts can be interpreted as surgical instruments from the Roman era, providing rare insights into ancient medical practices.