![]() ![]() ![]() An anastomosis -also called an isthmus- is a narrow space between two root canals that can harbor microorganisms and dentin debris packed into it during instrumentation, Clinical observations showed that persistent apical periodontitis is most frequent in molar teeth with their relatively complex anatomy- specially isthmuses, fins and lateral canals-that can prevent efficient cleaning and three-dimensional disinfection of the whole root canal system. Most often clinicians deal with narrow curved roots in which there is more than one canal, those canals are usually connected through fins or anastomoses. This is accomplished by disinfecting the whole root canal system through meticulous shaping and irrigation. The ultimate goal of root canal therapy is to prevent apical periodontitis or to allow healing of an existing-apical periodontitis by rendering the root canal system as free as possible from microorganisms. The Creative Commons Public Domain Dedication waiver ( ) applies to the data made available in this article, unless otherwise stated in a credit line to the data. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. ![]()
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