3Shape high occlusion

[Nick Woj]

I have noticed an inconsistency with occlusion over the years with CAD/CAM. I don't know if it is the software or if it is more to do with the mill. I always double check the articulation while designing the crown to make sure that the scan wasn't off. I also cut to the opposing at .25 but still occasionally get some high bites, not many but getting tired of someone walking a wax unit back to me to make an adjustment that takes less time then the walk to me. Does anyone have any usefully information that might help.

Keep in mind:
1.) Machines are regularly calibrates and always kept clean
2.) Bites are checked during design and made sure that there is contact on neighboring teeth

 

[JMN]

What is the intake scanner? Same for all high crowns?

What CAD? Version?
What CAM? Version?
What Mill? Version

 

[CoolHandLuke]

too many opportunities for bad bites, which is part and parcel of working with triple trays, elastic bands, mousse, and cheap milling units.

calibrate all you like, but a mill will always be +/- some factor. usually about .05, but often as much as .2mm especially in used, plasticy, or belt driven machines.

so a precision design (if it was precision) can end up way off due to the inherent nature of manufacturing. if that is unacceptable to you, spend more money and get a more consistent machine. im sorry, but thats what you get when you pay so little. a 30k$ glorified dremel on a gantry performs way way worse than a 250k$ CNC

 

[Contraluz]

I have noticed an inconsistency

That is my experience, too. Admittedly, my knowledge on the milling side is limted. But so far, I have experienced it more with 3Shape than with ZirkonZahn. And, it can go the other way, too.

The interesting part is the inconsistency, I think.

M

 

[A. M.]

Maybe the die is not all the way down on the model when you scan?

 

[Contraluz]

Maybe the die is not all the way down on the model when you scan?

I agree, that may be part of it...

 

[A. M.]

Actually I was wrong, because it would give him more space on thr occlusion...
Maybe your articulation when you scan? Sometimes I put a rubber band on the model to hold the bite, to make sure it won't move when scanning...