Abstract

In a number of researches, experimental methodologies and reviews of the endodontic literature concerning failed root canal treatment lack of adequate sealing (coronary and apically) was indicated. A penetration is formed between the sealer and the wall of the root canal. There are also scientific reports of infiltration between sealer and gutta-percha and the sealer in itself. Penetration of sealer into the open dentin tubules increases adhesion and sealing of the radicular part of the tooth. The importance of coronal sealing in the long-term success of endodontic treatment has been known for more than 100 years. Early researches in the area of endodontics focused on the quality of coronal sealing and the consequences of unsatisfactory restoration, did not receive the necessary scientific attention. The problem with reinfection of the dentin in already filled root canals has begun to be addressed since the mid-80s of the last century.

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