Regenerative endodontic Rx of perforated internal root resor
The present case report, published in the International Endodontic Journal , describes the regenerative endodontic treatment procedure of a perforated internal root resorption case and its clinical and radiographic findings after 2 years.

A 14-year-old female patient was referred complaining of moderate pain associated with her maxillary left lateral incisor. After radiographic examination, a perforated internal resorption lesion in the middle third of tooth 22 was detected.

Under local anaesthesia and rubber dam isolation, an access cavity was prepared and the root canal was shaped using K-files under copious irrigation with 1% NaOCl, 17% EDTA and distilled water. At the end of the first and second appointments, calcium hydroxide (CH) paste was placed in the root canal using a lentulo.

After 3 months, the CH paste was removed using 1% NaOCl and 17% EDTA solutions and bleeding in the root canal was achieved by placing a size 20 K-file into the periapical tissues. Mineral trioxide aggregate was then placed over the blood clot.

The access cavity was restored using glass– ionomer cement and resin composite. After 2 years, the tooth was asymptomatic and radiographic examination revealed hard tissue formation in the perforated resorption area and remodelling of the root surface.

Key learning points :-
• Regenerative endodontic treatment procedures are an alternative approach to treat perforated internal root resorption lesions.
• Calcium hydroxide was effective as an intracanal medicament in regenerative endodontic treatment procedures.

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