According to a survey by the American Dental Association, there has been a sharp increase in endodontically treated cases. This increase was described by Ruddle as the “good news or bad news” dilemma. The “good news” is that hundreds of millions of teeth are saved through the combination of endodontics, periodontics and restorative dentistry. The “bad news” is that tens of millions of endodontically treated teeth fail each year for a variety of reasons. The future of endodontics will therefore involve reprocessing its failures. Removal of all old filling material is the most vital step in root canal retreatment procedures. Say no to plagiarism. Get a tailor-made essay on “Why violent video games should not be banned”?Get the original essayTraditionally, this goal was achieved by using solvents like eucalyptus oil or xylol in combination with H files, heated instruments, GG drills, Peeso and ultrasonic reamers. However, this is a tedious process that has recently been replaced by NiTi rotary files, both standard files and files specifically designed for reprocessing procedures.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 part of the canal space and in narrow, curved canals. So, instead of creating an overly widened canal, it is imperative to design and introduce a file that will accommodate the natural anatomy of the canal space. A new type of anatomical finishing file, the XP-endo Finisher R (FKG Dentaire, La Chaux-de-Fonds, Switzerland), was introduced for use as a final step in improving root canal cleaning after removal of the previous filling. It consists of a #30 size tip and a non-conical rotating NiTi instrument made of a special alloy (MaxWire; Martensite-Austenite Electropolish Flex, FKG Dental). The file changes shape depending on temperature. The file is straight because it is in its martensitic phase (M phase) at room temperature. However, when subjected to body temperature, it enters its austenitic phase (phase A) and takes a spoon shape 1.5 mm deep in the last 10 mm of its length. The serpentine shape of the file and its resistance to cyclic fatigue make it ideal for gutta percha core removal during reprocessing procedures.5 MTA Fillapex and AH Plus are classified as resin sealants, having different compositions . AH Plus is an epoxy resin based sealant that has been considered the gold standard in physical and chemical properties. While MTA Fillapex is a salicylate resin sealant that contains mineral trioxide aggregates. The properties of root canal sealants 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 recently developed endodontic sealants for which only a few reports are available on its reprocessing potential. Keep in mind: this is just a sample. Get a personalized article from our expert writers now. Get a Custom Trial Thus, the aim of the study was to compare and evaluate the percentage of endodontic sealants remaining on the root canal walls using an XP-endo Finisher R file system as a complement, as well as the percentage and depth of penetration of the sealer after reprocessing. The null hypotheses of this study..