? Parameter change needed for certain prep shape?

[ps2thtec]

Have these two very long straight preps and my milled crowns are way too tight.
Do you ever change cement gap for this?

 

[CreDes]

I have to change parameters for different preps frequently.

 

[user name]

Parameter changes needing to be modified are likely due to incorrect drill compensation or a discrepancy in the actual tool dimensions vs whats in the CAM.

 

[ps2thtec]

Parameter changes needing to be modified are likely due to incorrect drill compensation or a discrepancy in the actual tool dimensions vs whats in the CAM.

So.... I probably have to talk with the guy milling for me. Thanks.

 

[user name]

So.... I probably have to talk with the guy milling for me. Thanks.

Drill comp is a calculation you have control of in crown bottoms.

 

[ps2thtec]

Drill comp is a calculation you have control of in crown bottoms.

This screen? I’ve never changed the Additional spacing. Is it locked ??

 

[user name]

This screen? I’ve never changed the Additional spacing. Is it locked ??

View attachment 34659

The only time I change the 'additional spacing' is to tighten it a bit when I scan a Ti abutment for a screw retained design.
Click the tab 'undercuts' at the top of that window. Make sure you check the box that says milling, and set the diameter to 1.2.

 

[ps2thtec]

The only time I change the 'additional spacing' is to tighten it a bit when I scan a Ti abutment for a screw retained design.
Click the tab 'undercuts' at the top of that window. Make sure you check the box that says milling, and set the diameter to 1.2.

Looks like it was set already?

 

[ps2thtec]

The only time I change the 'additional spacing' is to tighten it a bit when I scan a Ti abutment for a screw retained design.
Click the tab 'undercuts' at the top of that window. Make sure you check the box that says milling, and set the diameter to 1.2.

So after my , they were puzzled also. Had me change ‘additional spacing’ to .035, and mill them again.

 

[Car 54]

I have to change parameters for different preps frequently.

Same thing I do, especially with the bigger, longer molar (resistance, retention) preps that have a lot of surface area.

 

[charles007]

The only time I change the 'additional spacing' is to tighten it a bit when I scan a Ti abutment for a screw retained design.
Click the tab 'undercuts' at the top of that window. Make sure you check the box that says milling, and set the diameter to 1.2.

Agree here, but I also make slight changes on very short preps if I know crowns are going to mill out loose....zirconia or alloys.

 

[Car 54]

Agree here, but I also make slight changes on very short preps if I know crowns are going to mill out loose....zirconia or alloys.

Same here, I bump my setting(s) down one step, slightly tighter from my normal base spacer setting.

 

[user name]

Agree here, but I also make slight changes on very short preps if I know crowns are going to mill out loose....zirconia or alloys.

Reason I slightly tighten on Ti abuts is to compensate for the scan spray adding some dimension.