[sjtrny]

They probably use some type of bone cement to help close up gaps between the implant and the skull.

http://en.wikipedia.org/wiki/Bone_cement

[542458]

> Bone cement chemically is nothing more than Plexiglas (i.e. polymethyl methacrylate or PMMA).

Wow! I wonder if it's a special formulation - acrylic glass is really bad at chemical resistance (pretty much any organic solvent will damage it) and shatters pretty easily.

[sjtrny]

In one of the linked articles in the discussion it says the printed skull is made of PMMA. They must do something to it to make it last.

Edit: found it http://www.anatomics.com/products/cranial-implants/acrylic/