The key to remove old silver cones from root canals is to remove them in one piece. Ultrasonics and rotary files should be used very gently, because they can separate silver cone. If it separates you will have situation similar to broken file, but broken file is easier to remove. When you touch silver cone with ultrasonic tip it just falls apart into pieces. Do everything to keep it in one piece. Use some solvents to decompose filling paste - you will remove silver cone easier. Hope you will enjoy this movie.
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