A diagnosis of lateral (apical) periodontitis in tooth 32 was made and the treatment was started. Trepanation to pulp chamber was done with high speed diamond bur, rubber dam was placed and the working field was disinfected with chlorhexidine-ethanol solution. One root canal was found as indicated by the starting radiograph. The tooth was prepared to size 45/22 mm under constant irrigation with 1 % sodium hypochlorite.

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