Byline: Nikita. Kamat, Saritha. Vallabhaneni, Prahlad. Saraf, Laxmikant. Kamatagi, Shrishail. Totad
Introduction: The aim of this study was to compare canal transportation and remaining dentin thickness (RDT) of multiple-file system EndoStar E5 and single-file system XP EndoShaper (XPS) using cone-beam computed tomography (CBCT). Materials and method: A total of 50 mesiobuccal canals of the maxillary first molars with curvatures of 15°°-30°° were chosen and randomly divided into two experimental groups (n = 25). Canals were shaped with XPS in Group 1 and with EndoStar E5 in Group 2. According to the manufacturer's instructions, canal preparation was made. Canals were scanned before and after instrumentation using CBCT scanner to evaluate the root canal transportation at 3, 5, and 7 mm from the apex. Data were statistically analyzed, and significance level was set at P < 0.05. Results: Intergroup comparison mesiodistally showed that there was no significant canal transporation among both groups. Intergroup comparison buccolingually showed that there was statistically significant canal transporation at five millimeters when instrumented with XPS than EndoStar E5. With respect to RDT, intergroup comparison showed that mesially, distally, lingually, and bucally, there was no significant difference in the RDT. Conclusion: The present study indicates safety in the preparation of root canals with XPS as well as EndoStar E5. Both the files maintained original canal curvature while preserving RDT.
The ultimate goal of endodontic treatment is to remove infected pulpal remnants, destroy microorganisms, and adequately shape root canal system to fill the canal. When curvatures are present, endodontic preparation becomes more difficult and there is a tendency for all preparation techniques to divert the prepared canal away from the original axis. The curvature of the canal is considered to be a preeminent risk factor for procedural errors such as ledging, zipping, and transportation.
Transportation occurs due to the tendency of endodontic instruments to straighten within the canal during chemomechanical preparation. Glossary of endodontic terms of American Association of Endodontists defines canal transportation as 'the removal of canal wall structure on the outside curve in the apical half of the canal due to the tendency of files to restore themselves to their original linear shape during canal preparation may lead to ledge formation and possible perforation.'
Excessive dentin removal in a single direction within the canal rather than all directions causes canal transportation that may lead to ledge formation and perforation. The thickness of the remaining dentin following intra-radicular procedures correlates to fracture resistance of the root. Preservation of dentin is of utmost importance.
Introduction of rotary nickel titanium (Ni-Ti) instrumentation in endodontics is an important step in optimal root canal shaping procedure, as they maintain the original canal shape without creating severe irregularities such as zip, ledge or perforation, particularly in narrow curved canals, and also remains centered in the canal because of their superelasticity and shape memory.
Recently, a classical multi-sequential rotary file system EndoStar five (E5) (Poldent Co, Warsaw, Poland) has been introduced, and these files easily fit even in most curved canals, minimizing risk...