MicroMega H-Files, K-Files and K-Reamers are the most common hand files used for the root canal debridement. All /.02 tapered, packed in sterile blisters of 6, they exist in various tip diameters starting from n°06 up to n°140.
K-Files give a first “tactile” indication about anatomy, level of mineralization and curvature. They help evaluate how the treatment will be difficult to select the most suitable instruments sequence for shaping, while removing the primary mechanical constraints.
During this first exploration, K-files let determine the working length, with or without the use of an electronic apex locator.
Using K-files to recapitulate after each mechanized action made with a NiTi file favours the right glide path to be followed, prevents file separation, carefully explores the apical third and ensures its patency.
K-files may be of interest to bypass a separated NiTi file in the root canal.
Through their steeper-angled cutting edges, H-Files are best suited for vertical dentin cutting. They enlarge the root canal and remove debris from the apex to the coronal part with high efficiency, especially in case of irregular canals walls. Last indication relates to the extraction of separated instruments.
Originally used to find the canals entrances, they are now mainly used at the end of the root canal preparation as a finisher, to eliminate residual mineral and organic tissues or to place the sealer.