Figure 10: How to make a new channel inside a CTO

(a) Looking for the part of the hard tissue where the wire-tip gets stuck; (b) Feeding the wire through to the point where the tip bends slightly. With stiff wires like the ACS Standard, and even harder wires, be careful as the wire-tip doesn’t bend all that much, as can be seen from the figure; (c) Rotating the wire (in this example, clockwise, less than 180°) while slightly pulling back, and (d) just as the wire straightens, rotating and advancing it back along the channel.