[Septic pseudarthrosis of the mandible and endodontic treatment]

Septic pseudarthrosis of the mandible is an uncommon complication with several etiologies. The presence of a tooth next to a fracture site is one of the etiological factors. Conservative management of a tooth in or near the mandibular fracture site is often the issue when treating fracture of a toothed part.

A 49 year-old male patient was hospitalized in our department for a bifocal fracture of the mandible (right parasymphysis and left sub-condylar). An open reduction internal fixation with plates and screws was performed. The immediate postoperative period was uneventful except for persistent tooth pain in the parasymphyseal fracture site. At 1 postoperative month, the fracture site was stable and signs of consolidation were documented by the panoramic view. A dentist performed root canal treatment on tooth 42, 8 weeks after surgery, because of recurrent complaint by the patient. At 6 months, clinical and radiological examinations revealed mandibular pseudarthrosis.

This type of pseudarthrosis case is relatively infrequent. It occurs after endodontic treatment of a healthy tooth close to the fracture site (performed after the physiological delay before bone healing). The bacterial colonization of the fracture site could be related to this endodontic treatment. This case raises questions on the need for endodontic treatment of a tooth near a mandibular fracture site.