Abstract

Necrotizing sialometaplasia usually heals within 4 to 10 weeks with conservative treatment, and rarely recurs. When necrotizing sialometaplasia is present on the hard palate it may occur unilaterally or bilaterally. In this case, necrotizing ulceration occurred on the left hard palate of a 36-year-old woman after root canal treatment of the upper left firstpremolar under local anesthesia. After only saline irrigation the defect of the lesion completely healed and filledwith soft tissue. After 5 months, however, a similar focal necrosis was found on the contralateral hard palate without any dental treat-ment having been performed on that side and progressed in similar fashion as the former lesion. We conducted an incisional biopsy and obtained a finalpathological diagnosis for the palatal mass of necrotizing sialometaplasia. At the 3-year follow-up, the patient’s oral mucosa of the hard palate was nor-mal, without any signs and symptoms of the condition. We report a case of a second occurrence of necrotizing sialometaplasia on the contralateral side from the first, with a time lapse between the first and second currence.