In Vitro Comparison of Gutta-Percha Removal Using XP Endo Finisher and ProTaper With or Without Organic Solvent by Scanning Electron Microscope

Abstract

Introduction: Non-surgical endodontic retreatment is highly dependent on the removal of previous root filling material, bacteria and necrotic tissue. Various techniques and instruments have been used for endodontic retreatment. Recently, the XP-endo Finisher has been introduced in endodontic treatment to clean highly complex morphologies and difficult to reach areas. Aims: a) To compare the effectiveness of XP-endo Finisher and ProTaper universal retreatment system with or without organic solvent in removing gutta-percha. b) To compare the amount of apically extruded debris between the groups. Methods: 24-human- extracted, single-rooted teeth were divided into three groups of 8. The groups were classified as follows: Group I: using a ProTaper universal retreatment system with chloroform. Group II: using a ProTaper universal retreatment system without chloroform. Group III: using a ProTaper universal retreatment system followed by XP-endo Finisher without chloroform. The apically extruded debris was collected during the retreatment and weighted. The roots were split longitudinally. The degree of dentinal tubules patency was evaluated by scanning electron microscopy. Results: The most intensely clear dentinal tubules were observed in group III, followed by group II and group I, respectively. Group I resulted in a debris extrusion, significantly less, as compared with the other groups (P < 0.05). While there was no notable difference between group II and group III (P > 0.05). Conclusion: Under the conditions of the present study, out of all the retreatment techniques that were used, the XPendo Finisher was the most effective in the removal of the gutta-percha in cervical, middle and apical thirds. The use of solvent during retreatment can decrease the amount of the apically extruded debris.