Figure 1. Sectioning of the root filled plastic block. The sections were done 2, 7 and12 mm from the apex. Ca.1 mm was lost in each section because of the thickness of the cutting blade.
Figure 2.(A, B) A radiograph showing two plastic canals filled with the TF technique. Projections A and B are taken at 08 and 908. Note the high quality of the filling in the canal where no voids can be detected. Apical extrusion of the root filling is evident.
Table 1. The occurrence of overfilling and voids with the three techniques.
Table 2. Statistical evaluation of the hypothesis of no difference between the filling techniques (Fisher's exact tests, two-sided).
Figure 3. Minor apical extrusion of sealer was detected in some canals filled with the BF and LC techniques.
Figure 4. (A, B) A radiograph showing two plastic canals filled with the BF technique. Despite apical patency, no extrusion of the root-filling material can be seen. Small voids can be seen in the root filling (arrows).
Figure 5. (A, B) A radiograph showing plastic canals filled with the LC technique. Small voids can be seen in the root filling (arrows).
Figure 6. A cross-section of a BF filling. Master point (MP), Thermafil plastic core (TF-core), gutta-percha from the Thermafil point (TF-GP) and sealer are seen in the section, level 2a (see Fig.1).
Figure 7. Avoid (shown in Fig. 5A, right arrow) between the sealer and the gutta-percha in a LC filling (section level 3b, see Fig.1).
Figure 8. Avoid (shown in Fig. 4A, arrow) between the sealer and the gutta-percha in a BF filling (section level 3a, see Fig.1).
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