Screw Retained Crown Angle

[lilshow1255]

Do you have to have a 5 axis mill to be able to offset the screw channel angle when doing full contour screw retained crowns? How far can you angle the offset? Is anyone able to offset the angle to a certain degree on a 4 axis mill with success? I have a case where I want to angle the screw hole about 5 degrees. The only problem is I have a 4 axis mill.

 

[Tero]

Hi.
Full crown on titanium base?
I think we can do that...
Please send me the stl so we can check.

 

[eyeloveteeth]

Do you have to have a 5 axis mill to be able to offset the screw channel angle when doing full contour screw retained crowns? How far can you angle the offset? Is anyone able to offset the angle to a certain degree on a 4 axis mill with success? I have a case where I want to angle the screw hole about 5 degrees. The only problem is I have a 4 axis mill.

You don't HAVE to - but it will only help. There are many ways around this - if you create a big enough offset, and then make the angled screw access "perpendicular" enough, you should achieve a pretty successful result.

If it's pretty severe, then yeah, just send it out

 

[lcmlabforum]

Are you able to do what the Dynamic Screw Channel do digitally? You mean your
DDS do not need to use those OmniGrip/Hexaglobular screw drivers after that?
I know my lab guy has been doing this with Nobel implants in the past way before
all the Nobel ASC, or Dynamic system came out.
LCM

 

[Doug4DAL]

My question is , How can you have that extreme of an angle ? Doesn't the screw channel have to follow the long axis of the implant ? If you are using a milled interface to cement your restoration it has to be lined straight with your screw channel of it and that would be the insertion path of the walls of the interface , thus no angle degree in the milling of the restoration. Unless you know of a 90 degree driver you can't offset your angle .The only way to adjust the angle and maintain screw access would be to implement a " locator " type of a platform change .

 

[JohnWilson]

Because the diameter of the driver and the diameter of the hole differ, the head of the screw and the head of the driver also have play. Of course certain screw drivers and screw heads have less of an ability to offset. Also the incisal edge of many ant units will actually become the issue with the shaft of the driver. CAD just allows us a certain ammount of flexibilty in our designs, there is a reason why certain implant libraries lock down the abilty to do a simple angle correction with out doing a work around.

 

[brinbird]

Try adjusting the insertion direction to the angle you want the screw hole, increase the offset of the hole, this will get you close.... you may want to do some finishing in the green stage. Mill it in wax first to get a feel