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Dentinal dysplasia (DD) Type I, is a hereditary disturbance in dentine formation. In this anomaly, teeth in both primary and secondary dentitions are affected, and radiographically show short and blunted roots with obliterated root canals and periapical pathosis. Management of patients with DD has presented dentists with problems. Extraction has been suggested as a treatment alternative for teeth with pulp necrosis and periapical abscess. Follow-up and routine conservative treatment is another choice of treatment plan in DD. Another approach for the treatment of teeth with DD has included periapical surgery and retrograde filling, which is recommended in the teeth with long roots. The purpose of this report is to present an unusual case of dentinal dysplasia Type I in a 22-year-old woman showing upper and lower teeth with obliterated root canals and periapical radiolucencies. In this case, conventional endodontic treatment was performed. Postoperative radiographs and clinical evaluation demonstrated periapical healing and successful results. Based on the results of this case report, conventional endodontic treatment for cases with pulp necrosis and periapical radiolucencies in dentinal dysplasia is highly recommended.

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*Teeth with necrotic pulps and periapical rarefaction may show evidence of continued apical formation after root canal treatment. *Hertwig's epithelial root sheath may be more resistant than expected to trauma and infection.