Histopathologic and Microbiologic Investigations for Thirteen-Years Intentionally re-Implanted Maxillary Second Molar, A Case Report.

Background: A re-implanted maxillary 2nd molar with amalgam retrograde filling material was retained for 13 years. Histopathologic and Microbiologic investigations to reveal reasons for retaining and subsequent failure. Material and methods: The tooth was intentionally re-implanted 13 years ago with a retrograde amalgam filling material. After extraction of the tooth serial sections were done and stained with Hematoxylin and eosin stain (H&E) and Gram stains. Results: Histopathologic sections revealed cellular cementum deposition at the apex of the tooth. Sharpey's fibers were attached to the cementum. Granulation tissue was obvious around the apex of the tooth. Gram stain revealed accumulation of micro-organisms inside dentinal tubules, especially at the apex. Conclusion: The amalgam used as retrograde filling material, in this case, was retained for thirteen years and subsequent failure might be attributed to the invasion of a microorganism after a crown fracture.