Antiresorptive agent-related osteonecrosis of the jaw (ARONJ) causes severe pain that cannot be controlled well by common analgesic drugs. This is a first case report of intractable mandibular pain due to ARONJ that was eliminated by a continuous mandibular nerve block. A 72-year-old woman with osteoporosis had been administered bisphosphonate. One year after extraction of her tooth, she was diagnosed as having ARONJ. Jaw pain was so severe that she was unable to open her mouth and eat. We performed a continuous mandibular nerve block through an indwelling catheter with levobupivacaine for pain management. After the procedure, her rest pain was markedly improved, and the pain induced by opening her mouth disappeared. We conclude that a continuous mandibular nerve block may be helpful in the management of ARONJ.
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