Grzegorz Witkowski

Two treatment plans were presented to the patient, non-surgical root canal retreatment and surgical root canal retreatment. After intra-oral examination, the quality of the prosthodontic treatment was found to doubtful (Fig. 24). The decision was made to remove the crown and perform non-surgical retreatment. After local anaesthesia, the crown was cut with a high-speed handpiece (Fig. 25). The post was exposed and removed (Fig. 26 & 27).

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It is important to understand that when dentists work with rotary files, which typically rotates at approximately 300 rpm in the canal space, the flutes of the instrument are totally blocked just after the start of the motion. Therefore, most of the debris and cut dentine are packed into the lateral anatomy. This creates problems from the very beginning because of this blocking of already tight and narrow spaces, which are difficult to clean later.