Abstract
Traumatic dental injuries may cause the loss of a tooth's pulp vitality before the development of the root has been completed. A 12-year-old boy complained of a broken crown of one of his upper front tooth due to falling down. The tooth had a history of previous trauma 1 year ago. Clinically, the tooth was discolored with complicated crown facture. Intraoral periapical radiograph revealed an open apex of 1 mm in width. Mineral trioxide aggregate (MTA) plug, placed orthogratelly on the apical part, has proven a successful outcome based on a 3-year follow-up. In conclusion, MTA plug is a treatment of choice for cases of small open apex (1-mm diameter or less) of traumatized nonvital permanent teeth.
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