Final smoothing of bone before suturing’ the mucoperiosteal flap back into position is usually performed with a small bone file (Fig. 6-18, A). The bone file is usually a double-ended instrument with a small and large end. It cannot be used efficiently for removal of large amounts of bone therefore it is used only for final smoothing. The teeth of the bone file are arranged in such a fashion that they remove bone only on a pull stroke (Fig.6-18, B). Pushing the bone file results only in burnishing and crushing the bone and should be avoided.