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Cover : 3-D micro-CT models of a mandibular molar showing  the changes of the original root-canal anatomy (green) after preparation with a multiple-file rotary system. Each color  represents preparation by one of  five  instruments. The  last  image  in the sequence  represents the  root canal after shaping  (red) superimposed on  the original canal  (green), demonstrating  that most of  the surface area was prepared using  the multiple-file system. Click on the picture to enlarge Thanks to Oemus (in the name of Magda Wojtkiewicz) for the invitation to write the Editorial of this issue of Roots magazine as well as to illustrate the cover. I hope you also enjoy it!  Best regards, Prof. Dr. Marco Versiani Click here to read this complete issue of Roots magazine