Smooth Mesh Edge of Hand Orthesen?


I hope some one can please help me.

I want to create a hand orthesen or hand cast based on a 3d scan of my hand.

I have a nice clean 3D scan model of my hand.

Now I import it and offset the surface 3mm for my cast… then I cut out the areas for my fingers and thumb.

Thats all OK but now I want to select my hand cast model and smooth it overall so the sharp edges are gone.
This part needs to go onto my hand and cant have sharp corners.

I have no idea how I can smooth my entire mesh that it keeps the shape and size but rounds the edges.

Can you please help me.
Thank you.

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here is a photo of what i mean: