Extirpated pulps from 42 traumatized, asymptomatic teeth with no history of periapical pathosis, pulp exposure, or responsiveness to pulp tests were examined by light microscopic techniques. Only 5 pulps demonstrated infarcts; these were further evaluated with the transmission electron microscope. Eight microscopically, as compared lo the normal controls, the pulp tissue of the so‐called ischemic infarct was markedly altered. Some areas showed inflammation and altered nuclei, but with no discernible neural elements, and with less collagen. The electron microscopic samples showed evidence of necrosis, pal‐terns of nuclear degradation, relative avascularity, degenerating neural elements, and disorganized collagen. It was concluded that the ischemic in fan; l phenomenon in the traumatized pulp docs occur occasionally, but presents a variety of structural alterations indicating degeneration.
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