A Molar With an Intrabony Defect: Regeneration, Resection, or Extraction?

This is a potentially favorable regenerative candidate because the defect is deep enough to matter, the furcation is not involved, the endodontic status appears stable, plaque control is good, the patient is a nonsmoker, and mobility is only grade I. The critical unknown is defect morphology: a predominantly three-wall intrabony defect has a much better regenerative prognosis than a one-wall or circumferential defect. I would assess the number of remaining bony walls at surgery and review the radiograph for the angle and width of the defect. The crown margins and endodontic access also need to be checked for restorative problems that could sustain inflammation.

The alternatives are not equally good. Extraction and implant placement offer predictable replacement but sacrifice a functional tooth and require adequate bone and esthetics; a fixed partial denture would involve preparing adjacent teeth. Resective surgery with odontoplasty could eliminate the defect but risks furcation exposure, root sensitivity, and loss of support on a molar. Open flap debridement alone may stabilize the site but does not predictably gain bone. Regeneration with enamel matrix derivative or a graft plus barrier is reasonable if the defect is contained and the patient accepts that success is not guaranteed. The decision should be based on defect anatomy, endodontic stability, restorability, and the patient's willingness to attend maintenance.

After informed consent and local anesthesia, I would raise a full-thickness flap with a papilla-preservation incision, aiming for minimal trauma and primary closure. I would remove granulation tissue, carefully scale and root-plan the involved root, and confirm that the endodontic restoration has no coronal leakage or perforation. The defect would then be measured. If it is a contained intrabony defect, I would apply enamel matrix derivative or a particulate graft, with a barrier membrane if the anatomy allows, and close with fine monofilament sutures without tension. I would avoid excessive flap reflection and ensure the membrane is not exposed.

I would change the plan if the defect proves to be predominantly one-wall, if the furcation is actually involved, if the root is fractured or the endodontic filling is unsatisfactory, or if there is insufficient keratinized tissue for stable closure. In those situations, open flap debridement with possible resection, endodontic retreatment, or extraction may be more honest than forcing regeneration. I would also abort regeneration if plaque control at the time of surgery is poor or if the patient cannot avoid brushing and chewing on the site. Postoperative care includes chlorhexidine, avoidance of trauma, and review at 7–10 days; the patient must understand that regeneration is a biological attempt, not a guarantee.

I would describe the prognosis as guarded to favorable, depending on defect morphology, endodontic stability, plaque control, and maintenance. The tooth is asymptomatic and worth attempting, but regeneration does not reliably produce complete bone fill, and some recession or loss of the graft can occur. I would explain the alternatives again, including extraction and implant placement, and document that the patient chose to retain the tooth. The consent discussion should include infection, bleeding, swelling, membrane exposure, graft failure, root sensitivity, caries, endodontic failure, need for further surgery, and the possibility of extraction later.

Maintenance is part of the treatment, not an afterthought. I would arrange periodontal maintenance every 3 months initially, with probing, bleeding assessment, radiographs at appropriate intervals, and reinforcement of interproximal cleaning. The night guard should be worn if bruxism is active, but it does not substitute for plaque control. If bleeding and depth recur, early intervention is better than waiting for bone loss. The judgment is to attempt regeneration only when the biological and behavioral conditions support it, and to frame success as long-term retention and stability rather than a perfect radiograph.