الفهرس 
Assessment of the cleaning and shaping abilities of a novel adaptive core rotary instrument XP shaper versus one shape rotary system in extracted human permanent mandibular molars
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Abstract
Aim of the study : The purpose of the present in vitro study was to evaluate the amount of touched canal walls, canal transportation and centering ability of the XP Shaper single file system as compared to One Shape single file system. Methods: For the amount of touched canal walls evaluation, human permanent mandibular first molars with single oval canaled distal roots were selected (n=16). The samples were randomly and equally divided into 2 groups: group 1 (XPS) and group 2 (OS). The molars distal halves were separated, then mounted into epoxy resin blocks which were sectioned using ISOMET sectioning saw. The root sections were imaged with a stereomicroscope before and after instrumentation. Pre- and post-instrumentation scans were superimposed and evaluated using AutoCAD analytical software. Concerning the evaluation of centering ability and canal transportation, the mesio-buccal canals in extracted permanent mandibular first molars were selected (n=26). The molars mesial halves were separated, then randomly divided into two equal groups according to the type of instrument used. The samples of each group were mounted in transparent auto-polymerizing acrylic resin, then scanned, before and after mechanical preparation, using CBCT. Pre and post-instrumentation scans were superimposed and evaluated using OnDemand 3D software program