Hello everyone
I’m quite new to the slicer software, so please be kind to the rookie 
I’m doing my master thesis in the field of orthodontic tooth movement. One of my tasks is to quantitatively analyze dental arches. This means I have for example an intraoral scan (STL file) of the patients teeth (one for upper and one for lower arch) before and treatment happened, and a scan after the treatment. What I want to know is how much did every single tooth move. For this, I need to set a global coordinate system which should be the same for the compared (before and after treatment) arches. Looking at literature, there are various ways to do this. I was able to superimpose two STL models with some manually set reference points. This works quite well. I was also able to generate a deviation map. But this only indicates a more qualitative analysis. Is there a package/method where I can do the segmentation for teeth/gingiva where I get local coordinte systems for each tooth, and then calculate the translational matrix for each tooth between initial and post-treatment state? Let’s say by doing a least square fit for the corresponding teeth.
Hey, did you manage to find a proper way to do it? I need to do something similar and im encountering issues, the learning curve is huge.