Analysis of Cause of Endodontic Failure of C-Shaped Root Canals

Figure 5

SEM images of resected root tip of C-shaped root canals. (a1) Leakage around the gutta-percha filling area on the distal canal (×100). (a2) Pulp tissue and debris were observed (×500). (a3) Remaining microorganisms were found in the gap between the gutta-percha and the canal wall (×5000). (b1) Isthmus connecting mesiolingual and distal canals (×100). (b2, b3) Pulp tissue and debris were observed. (c1) Leakage around the gutta-percha filling area on the mesiolingual canal (×100). (c2) Pulp tissue and debris were observed (×500). (c3) Remaining microorganisms were found in the gap between the gutta-percha and the canal wall (×5000).