Maillefer's new Protaper Gold system, even more flexible and with better access to the tooth. progressive taper. Made of nickel-titanium, they are the latest generation in endodontic rotary mechanical instrumentation for a fast and efficient preparation of root canals, respecting their anatomy. Advantages: Multiple taper improves flexibility, cutting efficiency and reduces stress - Long convex canals are configured using only 3 to 4 instruments - Less labor time: fewer instruments - Cutting efficiency - Safe and simple.