MikeW
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Not sure if anyone has mentioned it here yet but its very important to note that you can only have a maximum of 2 insertion directions with a 4 axis mill. Even if you only have 2, the rotation of the object will be locked to 1 of two orientations because the machine will need to keep the two insertion directions along the rotative axis. So if its a bridge in a block, many times it will not fit unless you override the rotation. When doing this you'll be left with undercuts in the prep area of the restoration that you'll have to grind away by hand. Anything above 2 insertion directions requires 5 axis. Anything like pratteau bridges, you'll need a 5 axis mill to be able to properly mill the emergence profile. There is the possibility of using lollipop tools (shaped like burs) to mill out subtle undercuts on a 4 axis mill but otherwise you're out of luck unless you get a 5 Axis Mill.
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