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We report on dental and mandibular pathology in Labidosaurus hamatus, a 275 million-year-old terrestrial reptile from North America and associate it with bacterial infection in an organism that
is characterized by reduced tooth replacement. Analysis of the surface and internal mandibular structure using mechanical
and CT-scanning techniques permits the reconstruction of events that led to the pathology and the possible death of the individual.
The infection probably occurred as a result of prolonged exposure of the dental pulp cavity to oral bacteria, and this exposure
was caused by injury to the tooth in an animal that is characterized by reduced tooth replacement cycles. In these early reptiles,
the reduction in tooth replacement is an evolutionary innovation associated with strong implantation and increased oral processing.
The dental abscess observed in L. hamatus, the oldest known infection in a terrestrial vertebrate, provides clear evidence of the ancient association between terrestrial
vertebrates and their oral bacteria. 相似文献
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