Sweet tooth: DNA profiling of a cranium from an isolated retained root fragment.

Sampling of healthy multi-rooted teeth is recommended for the genetic identification of human skeletal remains. However, this may not always be possible, as in the reported case consisting of an isolated human cranium found in an aggregate crushing and processing plant in Piedmont, Northwest Italy. The cranium displayed significant weathering, suggesting a post-mortem interval of several years, and was edentulous with the exception of the apical root fragment of the upper left canine, consequence of an antemortem horizontal fracture. Prolonged decalcification of the root fragment followed by powder-free DNA extraction from ~10 mg of root tip tissue led to the recovery of >10 ng of high molecular weight human DNA, in comparison with ~0.01 ng of DNA per mg of bone powder obtained from the petrous portion of the temporal bone. Quantity and quality of DNA isolated from apical tooth tissue enabled multiple genotyping, including a reportable female STR profile, mitochondrial DNA analysis, and ancestry-informative insertion/deletion polymorphisms. Although the cranium remained unidentified after DNA comparisons, our findings confirm that apical tooth tissue is a promising source of DNA, easily obtained through a powder-free extraction protocol. Results also indicate that root tips should not be overlooked in challenging identification cases, even in the presence of compromised tooth specimens.

An unusual work-related fatality: the importance of scene investigation combined with autopsy findings.

Transorbital penetrating intracranial injuries are uncommon amongst the civilian population, but they can be found in fatal work-related accidents. An unusual case of accidental fatal penetrating intracranial injury in a 44-year-old man at work is reported. He was working in a building site driving a tractor with a rear- mounted flail mower. While he was mowing grass close to a crane, he became unconscious and then comatose. A cranium X-Ray and a brain CAT scan taken before he died revealed the presence of a metallic foreign body in the left occipital area that had penetrated the left eyelid and orbital bone. At autopsy, a fragment of a frayed electrical copper cable was found stuck in the brain. Investigation at the scene found a cable with the same characteristics of the fragment recovered from the victim's brain protruding from the ground just beneath the tractor. It was concluded that the mower blades had severed the cable and propelled a fragment of it upwards, striking the man in the head.