Is it possible to contract creutzfeldt-jakob disease from a dental procedure?

Highly Doubtful: It is difficult to develop a prion disease such as that in any case and it usually is if direct contact is made with nerual tissues and that would also mean the instruments used would have to be contaminated and again very unlikley. I have never heard of anything like that.

Extremely unlikely: From any routine dental procedure, unless you were receiving some biologic tissue implant which was contaminated - which in itself is also extremely unlikely.