PubMed · 1923269
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F Stetchey. Forensic dentistry.. https://pubmed.ncbi.nlm.nih.gov/1923269/
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Human bites in cases of homicide, sexual assault, and abuse are often distorted due to the elasticity and curvature of the skin. Physical comparison of a bite mark to a suspect's teeth is sometimes difficult. Saliva, which is usually deposited during biting, can be collected and analyzed to identify the perpetrator. Using simulated bite mark situations in two experimental series, three samples of 40 microL of whole saliva were deposited on the skin of 27 cadavers (at 33 sites) and three samples of 100 microL of whole saliva were deposited on the skin of 5 cadavers (at 12 sites). Saliva was collected using the double swab technique at t = 5 min, t = 24 h, and t = 48 h. DNA was extracted using the modified Chelex method and submitted to PCR-based typing at two short tandem repeat loci. Results indicate that the concentration of DNA in saliva recovered from skin varies as a function of time since deposition. There is a significant decrease in concentration in the first 24 h but the concentration remains stable from 24 to 48 h. The success of PCR amplification is independent of the time since deposition or the concentration of DNA in the saliva sample. Contamination from the DNA of the cadaver was not found in any of the cases studied.
Tongue biting associated with tonic/clonic movements of the limbs is common in epileptic patients, however nocturnal tongue biting as the only manifestation of epilepsy is rare. It can be found in frontal lobe epilepsy. Two cases with the same manifestation of nocturnal tongue biting were presented. One was the result of parasomnias-rhythmic movement disorders (RMD) and the other was a result of nocturnal frontal lobe epilepsy. The definite diagnosis of these abnormal nocturnal events was documented by prolonged EEG monitoring and polysomnography with simultaneous video studies. To our knowledge, RMD presenting with nocturnal tongue biting has never been reported in Thailand. Even in the foreign journals it has rarely been reported. It is crucial to make a definite diagnosis of RMD and nocturnal epilepsy to avoid overtreatment in the former and undertreatment in the latter. Symptomatology, diagnostic approach with therapy of these disorders were reviewed.