# How to superimpose 2 stl files. Need help

**URL:** <https://discourse.slicer.org/t/how-to-superimpose-2-stl-files-need-help/45827>\
**Category:** Support\
**Tags:** registration\
**Created:** [January 19, 2026, 4:44pm UTC](https://discourse.slicer.org/t/how-to-superimpose-2-stl-files-need-help/45827 "2026-01-19T16:44:49Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![DrSifali](https://avatars.discourse-cdn.com/v4/letter/d/41988e/32.png) [@DrSifali](https://discourse.slicer.org/u/DrSifali)\
**Post date:** [January 19, 2026, 4:44pm UTC](https://discourse.slicer.org/t/how-to-superimpose-2-stl-files-need-help/45827/1 "2026-01-19T16:44:49Z")

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I need help on how to superimpose 2 stl files to analyze tooth movements

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [January 19, 2026, 10:40pm UTC](https://discourse.slicer.org/t/how-to-superimpose-2-stl-files-need-help/45827/2 "2026-01-19T22:40:33Z")

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There are many surface registration tools in Slicer. Two are Segment Registration in SlicerRT extension ([GitHub - SlicerRt/SegmentRegistration: 3D Slicer extension for segment registration (aka fusion, contour propagation)](https://github.com/SlicerRt/SegmentRegistration)) and FastModelAlign in SlicerMorph ([Tutorials/FastModelAlign at main · SlicerMorph/Tutorials · GitHub](https://github.com/SlicerMorph/Tutorials/tree/main/FastModelAlign#readme))

You can give those a try.

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**Author:** ![Aiden](https://avatars.discourse-cdn.com/v4/letter/a/d2c977/32.png) [@Aiden](https://discourse.slicer.org/u/Aiden)\
**Post date:** [January 19, 2026, 11:35pm UTC](https://discourse.slicer.org/t/how-to-superimpose-2-stl-files-need-help/45827/3 "2026-01-19T23:35:00Z")

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> [@muratmaga](#):
>
> There are many surface registration tools in Slicer. Two are Segment Registration in SlicerRT extension ([GitHub - SlicerRt/SegmentRegistration: 3D Slicer extension for segment registration (aka fusion, contour propagation)](https://github.com/SlicerRt/SegmentRegistration)) and FastModelAlign in SlicerMorph ([Tutorials/FastModelAlign at main · SlicerMorph/Tutorials · GitHub](https://github.com/SlicerMorph/Tutorials/tree/main/FastModelAlign#readme))
> 
> You can give those a try.

Do you know if any of these would work for my purpose? Which is aligning an intraoral scan (.stl file) with the maxilla (.dcm of CBCT).

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [January 19, 2026, 11:58pm UTC](https://discourse.slicer.org/t/how-to-superimpose-2-stl-files-need-help/45827/4 "2026-01-19T23:58:13Z")

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No idea, you need to try it yourself.

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**Author:** ![DrSifali](https://avatars.discourse-cdn.com/v4/letter/d/41988e/32.png) [@DrSifali](https://discourse.slicer.org/u/DrSifali)\
**Post date:** [January 20, 2026, 2:03am UTC](https://discourse.slicer.org/t/how-to-superimpose-2-stl-files-need-help/45827/5 "2026-01-20T02:03:55Z")

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I will give a try then.  
Thank you.  
And another question…  
Is it possible to analyse the degree and liner measurements.. After superimposing? Can we get how much torque is achieved.. And how many mms a tooth moved…?? Is it possible in 3d slicer?

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<div class="post-metadata">

**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [January 20, 2026, 7:19pm UTC](https://discourse.slicer.org/t/how-to-superimpose-2-stl-files-need-help/45827/6 "2026-01-20T19:19:34Z")

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> [@DrSifali](#):
>
> Is it possible to analyse the degree and liner measurements.. After superimposing? Can we get how much torque is achieved.. And how many mms a tooth moved…?? Is it possible in 3d slicer?

You should be able to measure the displacement of the tooth either with markups, or by segmenting. Rest, IDK.