The root canal space is never a perfect round shape. Shaping of these spaces is difficult. what also is difficult is obturation of such canals that are probably oval or dumbbell in shape. The 3 D obturation or the warm guttapercha technique gives us a complete seal of such canal spaces close to 100%.
This video demonstrates the technique of obdurating the root canals 3 dimensionally using the warm gutta percha technique.
Link mentioned in the video about posterior quadrant isolation with rubber dam - https://youtu.be/CQs8Lca_7oY
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