We repair a lot of handpieces. One of the most common complaints with the highspeeds is that the bur is slipping from the chuck. This of course is annoying and dangerous. Often this occurs in relatively new turbines that would otherwise have a good deal of life left in them. I want to recommend that you put a drop of liquid oil into the hole where the bur is inserted on a weekly basis. The normal oiling procedures and even the machines like the Assistina or Quatrocare do not put oil into the actual chucking mechanism. Please note that even the “Oil Free” handpieces need to have their chucks oiled if they are to give you the maximum life. Our choice of liquid oil is the LubriCleanse synthetic. This oil has special properties that keep it from changing or deteriorating during sterilization.