[Yak3000]

Hi, sorry if my question is inappropriate in organic chemistry and should belong to inorganic, but as far as I understand this is both. I am not a chemist but a neuroscientist, so I don't know that much about chemistry.
Anyway, I have the following problem:
I am working in brain research and fixated an implant made out of polyurethane resin with dental cement (Paladur, which has a powder component: Methylmethacrylate – Copolymer, and a liquid component: Methylmethacrylate, Dimethacrylate). But when I want to separate the dental cement afterwards from the PUR I had the problem that I cannot use acetone, since it would dissolve both of them. Could you please recommend me a substance I could use that dissolves or destabilizes the dental cement but not the PUR?

Thank you so much in advance!