Evaluation of the shaping effectiveness of three different rotary systems and hand files in primary molars: a micro-CT in vitro study

All instruments tested in this study could safely shape curved and narrow root canals of primary molars, however K-files lead to less apical transportation than OneShape and paediatric rotary EndoArt Pedo Blue files. It may be concluded that it is safe to use rotary instrumentation in root canal shaping of primary teeth that are designed for primary and permanent teeth. However, K-files may provide more tactile sensation than the tested Endo-Art pediatric and OneShape rotary files, which is important in primary root canal shaping to avoid extrusion of material to the permanent teeth germs.