3shape: scan diagnostic and prepared models in the same position

[NDLMilling]

hello DLN,

Recently I've come across a number of cases that I wanted to scan diagnostic/preopp models, but haven't been able to due to vast differences between the diagnostic and prepared models.

With the new 2013 scanning software there's an option to "skip alignment, transfer plates used", which allows you to use the scanned position as the aligned position. It's nice when you have a removable diagnostic waxup, but if you're scanning two diffident models it doesn't help.

I'm sure there are other ways to do it, but I wanted to share how I scan two totally different models, in the same position in relation to the scanning plate.

Basically, I mounted the 3shape scanning plate to an articulator, so you can articulate both models to both the opposing model, and the scan plate.





step one: articulate prepared model with opposing using bite from original articulation. Make sure to set the stop on the articulator.



Step two: articulate the diagnostic.


Both models, articulated to the scan plate in the same way:


This was the first case I scanned like this, and I was happy with the results. here's a comparison of 3shapes's auto alignment vs my way:


single point alignment:



3 point alignment:

Using the articulator:


What are your thoughts/input?

-Greg

 

[sirmorty]

Looks like you got a way better result. Thanks for sharing.

It is hard sometimes to get good scans to line up when there is very little to go by on the prepped model compared to the diagnostic. which is usually the case

Sometimes I find it's easier if you make a couple points with a bur on the models in the same area's and just line them up with each other.

The auto alignment looks terrible. Seems like 1 point alignment is better then 3 point however.

 

[CoolHandLuke]

yeah, thats about the best way to go about it without resorting to a set of silicon matrixes and a bunch of wax. alternatively if there is at least one tooth then you can make a wax transfer near it, or on it, to enhance triangulation.

 

[Sevan P]

Well that's one way of doing it. Nice results. On the articulated method how man alignment points?

 

[stumpf]

I dont know why this method is not working for me

 

[stumpf]

Here is the result...

 

[cadfan]

But in this case are still two molars for alinement's so with exo you dont have to go that way for example. does it work without any alingment orientation too
in clear words nothing on both models is nearly the same

alingment of to parts that have some identical areas is a real simple operation with the right tools

 

[eyeloveteeth]

looks good!