Oral Surgery · patient case question
If the fragment is to be removed, what is the most appropriate surgical approach?
Patient case: Retained root fragment of a mandibular premolar
Patient: Male, 51 years old
Chief Complaint: “Something is still in there from when that tooth came out.”
Background: Extraction of #29 elsewhere several months ago. No systemic disease, no anticoagulants.
Vital Signs: BP 128/80 mmHg · HR 72 bpm · T 98.2°F
Findings: Periapical radiograph shows a retained apical root fragment of the mandibular right second premolar, approximately 4 mm long, lying within healed alveolar bone. The mental foramen is visible 3 mm inferior to the fragment. Overlying mucosa is intact with no swelling, sinus tract or tenderness.
Show answer and explanation
Correct answer: A. Raise a full-thickness BUCCAL mucoperiosteal flap, remove overlying buccal bone, and elevate the fragment with a root pick
- A. CORRECT. Access first, force second. A full-thickness BUCCAL mucoperiosteal flap with controlled removal of the overlying buccal cortical plate gives direct vision, allows the fragment to be delivered with a fine root pick or apical elevator under a purchase point, and lets the socket be irrigated and debrided before closure. The buccal plate is the thinner and the safer plate to sacrifice, and it regenerates. Where the fragment sits close to the mental foramen, direct vision is what protects the nerve.
- B. The LINGUAL plate must be preserved. Perforating it risks displacing the fragment into the SUBLINGUAL or SUBMANDIBULAR space, where retrieval requires a far more extensive procedure, and it puts the lingual nerve and the floor-of-mouth vessels at risk.
- C. Troughing mesially and distally attacks the interproximal bone, which is the bone supporting the ADJACENT teeth. It also works blind, in the narrowest dimension available, and risks displacing the fragment apically toward the mental neurovascular bundle.
- D. Blind apical force is how a fragment ends up in the inferior alveolar canal or the mental foramen. Force without vision is the single most common way this procedure goes wrong.
Note: Consider first whether it should be removed AT ALL. A small (under about 5 mm), deeply placed, ASYMPTOMATIC fragment in a healed socket with no radiolucency and no infection may reasonably be left and radiographically monitored, particularly when retrieval would endanger the mental nerve or the sinus. Document the finding, inform the patient, and review. Remove it when it is symptomatic, infected, mobile, superficial, associated with pathology, or sitting where a planned implant or denture will go.