topic Re: How to decrease diameter of internal channels (make holes tighter)? in Meshmixer Forum

How to decrease diameter of internal channels (make holes tighter)?

uqlcai1 — Mon, 17 Jul 2023 08:36:06 GMT

Hi all,

I am working with a model of a tooth, with some interior cavities reflecting the pulp area, and the root canal leading out.

Specifically, I am stuck trying to edit the mesh so that the root canal (but not the pulp) is much smaller/tighter. Like, decreasing the internal diameters. The tip inner diameters should be ~0.2 mm, and the pulp opening inner diameters should be ~0.5 mm.

This is the workflow I've attempted so far:

Since I can't figure out how to select the internal faces, I selected all surfaces, then slowly brushed away unwanted surfaces, then adding a smooth boundary operation.
Next I tried to just do an extrude.
Finally, remesh/smooth my way to transition the boundaries.

However, I realise that there are some parts in the middle of the root canal that start off thinner than the endings, so using Extrude (Direction = Normal) to sufficiently tighten the outer parts end up sealing the middle parts:

I think maybe selecting this section as its own FaceGroup and adjusting it may be a solution, but I cannot figure out how to select this inner wall section.

Would anyone be able to help, or suggest alternative workflows?

I have attached my .mix file if anyone would be kind enough to give it a go.

Re: How to decrease diameter of internal channels (make holes tighter)?

hfcandrew — Wed, 19 Jul 2023 16:37:41 GMT

Hard to see and select inside, so just separate it out so you can see, then do a soft transform on your desired portion, then combine it back in and close cracks.

(view in My Videos)

Re: How to decrease diameter of internal channels (make holes tighter)?

uqlcai1 — Fri, 21 Jul 2023 07:22:39 GMT

[accidentally replied to the wrong message]

Re: How to decrease diameter of internal channels (make holes tighter)?

uqlcai1 — Fri, 21 Jul 2023 07:21:56 GMT

Incredibly helpful video. Thank you!

Re: How to decrease diameter of internal channels (make holes tighter)?

lamqviet — Tue, 26 Nov 2024 03:51:06 GMT

Can you show me how to segment the canal of teeth. Thanks

Re: How to decrease diameter of internal channels (make holes tighter)?

hfcandrew — Tue, 26 Nov 2024 14:13:28 GMT

Sure, just post your .mix