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ePaper created 2018-05-16, 11:45:19 | version 1.38.0
Fig. 9a The apical 10 mm of the file transforms into a bulb more coronally and a tip in the last few millimeters. When rotating at canal temperature, the XP-endo Finisher exhibits a total expansion of 3 mm. Fig. 9b The XP-endo Finisher is placed in the canal in the martensitic phase. When in the canal, body tempera- ture transforms it to the austenitic phase. Moved up and down in 7–8 mm incre- ments, the natural shape of the canal expands or con- stricts the tip or the bulb and disrupts debris, tissue or biofilm, which is removed by the turbulence of the irrigant. Fig. 9a Fig. 9b the canal is in the mesiodistal dimension owing to internal resorption. The Finisher enabled removal of debris and tissue in the irregularity while retaining the original shape of the canal and preventing further weakening of the root. There is a third file in the XP-endo system, the XP-endo Finisher R designed for retreatments. This file is a #30/0.00 making it slightly stiffer and more efficient in removing root filling material adhering to the canal walls, especially in the curva- ture or oval areas. The residual amount of filling material when a tooth is retreated is difficult to calculate; however, studies using histological evaluation of teeth with post-treatment periapical periodontitis show evidence that bacterial colonization is associated with the canal remnants. A new supplementary strategy using a fin- ishing instrument was evaluated for its ability to improve filling material removal in a recent study, and the results showed substantial reduction in residual contents when the Mtwo system and RECIPROC system were used for retreatment. The results using the XP-endo Finisher R instru ment were encouraging because the remaining filling volume showed a 69% reduction in volume contents. In canals with residual filling material, an adjunctive approach with the XP-endo Finisher R instrument significantly enhanced removal (Fig. 12).16 debridement and disinfection of the apical third area. Have we achieved the ideal fusion of technology and biology for long- term positive treatment outcomes? Per- haps. What has been achieved is a redress of a design flaw that has persisted for much too long. Editorial note: This article first appeared in May 2017 in the Dentaltown magazine. A list of references is available from the pub- lisher. Conclusion Preliminary studies on XP-endo files have shown remarkable removal of soft tissue, fewer dentinal chips residual in the isthmus and canal walls after instrumentation, and low dentinal stress (fewer micro cracks). The minimally invasive conservative instru- mentation engenders a low amount of dentin removal coronally and efficient Article Endodontics issue 2018 — 39