Oral Surgery · patient case question
How should the dentist proceed with the required extractions?
Patient case: Evidence, and a Patient Irradiated Ten Years Ago
Patient: 66-year-old male
Chief Complaint: Two non-restorable mandibular molars requiring extraction.
Background: Squamous cell carcinoma of the floor of mouth treated ten years ago with surgery and RADIOTHERAPY to the head and neck, total dose approximately 66 Gy. Currently disease-free. His new dentist is reviewing the published evidence on managing extractions in irradiated bone.
Medications: None
Vital Signs: BP 132/80 mmHg · HR 74 bpm · RR 16 · T 98.4°F
Findings: Teeth #30 and #31 are non-restorable with periapical radiolucencies. Overlying mucosa is intact. Xerostomia with rampant cervical caries on the remaining dentition. Trismus with maximum opening 32 mm.
Show answer and explanation
Correct answer: B. Refer to an oral and maxillofacial surgeon for management, with consideration of hyperbaric oxygen or antibiotic protocols
- A. There is no basis for a six-month interval, and delay simply allows the infection to progress.
- B. CORRECT. Radiation-induced changes in bone are PERMANENT and do not resolve with time. The irradiated mandible is hypocellular, hypovascular and hypoxic, so any surgical wound risks OSTEORADIONECROSIS. At a dose above 60 Gy to the posterior mandible the risk is substantial and lifelong. The correct step is specialist referral for atraumatic surgical technique, primary closure, prophylactic antibiotics, and consideration of hyperbaric oxygen or the alternative pentoxifylline-tocopherol protocol.
- C. The passage of time does NOT restore the vascularity of irradiated bone. Ten years does not make routine extraction safe — this is the central misconception the item is testing.
- D. Non-restorable teeth with periapical lesions cannot be maintained on antibiotics. Chronic infection in irradiated bone is itself a trigger for osteoradionecrosis.
Note: The rule for irradiated patients is that dental extractions should ideally be completed at least 2–3 weeks BEFORE radiotherapy begins. Afterwards, prevention becomes everything: daily 5000 ppm fluoride, meticulous hygiene, saliva management, and avoiding elective surgery in the field for life. ORN affects the posterior MANDIBLE overwhelmingly, because it receives the highest dose and has the poorest collateral supply.