# 3d slicer in Orthodontic field

**URL:** <https://discourse.slicer.org/t/3d-slicer-in-orthodontic-field/32686>\
**Category:** Support\
**Created:** [November 9, 2023, 2:48am UTC](https://discourse.slicer.org/t/3d-slicer-in-orthodontic-field/32686 "2023-11-09T02:48:26Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Mah](https://avatars.discourse-cdn.com/v4/letter/m/e36b37/32.png) [@Mah](https://discourse.slicer.org/u/Mah)\
**Post date:** [November 9, 2023, 2:48am UTC](https://discourse.slicer.org/t/3d-slicer-in-orthodontic-field/32686/1 "2023-11-09T02:48:26Z")

</div>

hello, i want to use 3D slicer for Orthodontic purposes,  
i want to measure the surface dimensional accuracy between two stl files data.  
the first file is a 3d scanned dental model, the other file is a 3d scanned clear aligner

as you know the clear aligner device have two surfaces, outer surface and inner surface (the surface that is in a direct contact with the teeth)

in other software like Geomagic control; i can separately measure the surface differences between the inner surface of the aligner and the teeth of the 3d dental model.

i want to know if this is possible to do with 3d slicer,  
can i remove the outer surface of the aligner from measurements and keep only the inner surface.

thank you,