A histopathological study on human nerve root with pulp lesion at Basrah city/ southern Iraq was carried out. Five cases were selected from a total of one hundred patients who suffered severe pain due to toothache and complicated by tooth nerve root lesions associated with infection by Entamoeba gingivalis. Evidence of degenerate vacuolated nerve fibers associated with crystalloid deposits was noticed. There was also chronic inflammatory reaction containing mononuclear cells and fibrosis.
Key words: Entamoeba gingivalis, buccal cavity, dental pulp, parasitological investigation.
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