Access cavity was made with a high-speed diamond and the old root filling localised. The rubber dam was placed on the tooth and the area was disinfected with chlorhexidine/ethanol (0.5 % / 70 %). Size 30 reamer was inserted into the canal to the length previously measured from the preoperative radiograph and a working length radiograph was taken. The canal was prepared with reamers and Hedstroem files to size 70/21.5 mm. The canal was constantly irrigated with 0.5 % sodium hypochlorite. At the end of the preparation the canal was irrigated with 17 % neutral EDTA and dried with paper points. Calcium hydroxide was packed in the canal, which was sealed with IRM filling.

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