A 31-year-old woman fractured the lower left central incisor when it was hit by her 2-year-old  son's head with mesiobuccal subgingival margin (Fig.1).  After RCT (Fig.2), gingivectomy is conducted with eletrosurg to expose the fractured margin (Fig.3).

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Xin Wei, DDS, PhD, MS 1st edition 02/23/2019, last revision 02/23/2019