According to a study conducted by the American Dental Association, there has been a notable increase in cases treated endodontically. This increase has been described by Ruddle as the “good news – bad news” dilemma. The “good news” is that hundreds of millions of teeth are recovered through the combination of endodontics, periodontology and restorative dentistry. The “bad news” is that tens of millions of endodontically treated teeth fail each year for a variety of reasons. Therefore, the future of endodontics will include the management of retreatment of its failures. Removing all old filling material is the most important step in root canal retreatment procedures. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an Original Essay Traditionally, this has been achieved by using solvents such as eucalyptus oil or xylene in combination with H files, heated tools, GG drills, Peeso reamers, and ultrasonication. However, it is a tedious process that has recently been replaced by NiTi rotary instruments, including standard instruments or those specially designed for reprocessing procedures. Although these techniques can be considered effective, complete removal of the filling material is not achieved, especially in the apical third portion of the canal space and in narrow and curved canals. Therefore, instead of creating an overly widened canal, it is imperative to design and introduce an instrument that adapts to the natural anatomy of the root canal space. A new type of anatomical finishing instrument, the XP-endo Finisher R (FKG Dentaire, La Chaux-de-Fonds, Switzerland), was introduced to be used as a final step to improve cleaning of the root canal after removal of the root canal. previous filling. It consists of a size no. 30 and a non-tapered NiTi rotary instrument made of a special alloy (MaxWire; Martensite-Austenite Electropolish Flex, FKG Dentaire). The file changes shape based on temperature. The file is straight, as it is in its martensitic phase (M phase) at room temperature. However, when subjected to body temperature, it enters the austenitic phase (phase A) and takes on a spoon shape 1.5 mm deep in the last 10 mm of its length. The file's serpentine shape and resistance to cyclic fatigue make it ideal for gutta-percha core removal for reprocessing procedures.5 MTA Fillapex and AH Plus are classified as resin-based sealants, having different compositions. AH Plus is an epoxy resin based sealant considered the gold standard for its physical and chemical properties. While MTA Fillapex is a salicylate resin-based sealant that contains mineral trioxide aggregate. The properties of root canal sealers impact the quality of the final root filling. MTA Fillapex produces an alkaline pH, which may contribute to their osteogenic potential, biocompatibility and antibacterial capacity. It is one of the newly developed endodontic sealants of which only a few reports are available on its retreatment potential. Please note: this is just a sample. Get a custom paper from our expert writers now. Get a Custom Essay Therefore, the purpose of the study was to compare and evaluate the percentage of endodontic sealers remaining on the root canal walls using an XP-endo Finisher R file system as an add-on and the percentage and depth of penetration of the sealer after reprocessing. The null hypotheses of this study are: (1) There is no difference between sealant penetration.