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1 School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
Traumatized sound teeth occasionally develop devitalized, infected pulps. An effort was made to determine where the organisms that cause infection originate. An organism not indigenous to the mouths of dogs or monkeys, Serratia marcescens, was implanted in the gingival crevices of these animals. The organism was recovered from the pulp tissue or root canal in approximately a third of the teeth after trauma.
Submitted on July 18, 1966
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