A 44-year-old man presented to our hospital with painless swelling of the left cheek that had persisted for one year. He had previously undergone periodontal regenerative therapy with REGROTH®. One month after surgery, he noticed a diffuse swelling in the left buccal region, which persisted without regression and remained as a mass-like lesion. Therefore, he visited our department one year postoperatively for further evaluation.
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KOYAMA et al. (2026) studied this question.
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