Although gold was always touted as being very "biocompatible" and used with gold inlays that go subgingival, it should not be used in implant restorations. This is because gold was shown in a 2008 dog study to have an apical shift of the barrier epithelium and marginal bone after being left in place for several weeks. Also, the connective tissue zone for gold alloy abutments showed less collagen and fibroblasts and larger fractions of leukocytes. What this means is that gold causes an inflammatory reaction. Another study showed that gold alloys get no hemidesmosomal attachment to abutments which means that they ultimately have a pocket at all implant restorations. This will eventually cause bone loss on your implant.
Causes inflammatory reaction
Has a pocket at all implant restorations
Leads to bone loss
Zirconium Oxide and Titanium Abutments w/ titanium to titanium connections
stable tissue dimensions
chosen by most clinicians
By avoiding gold and keeping with biologically sound materials, we can have happy patients and long-lasting implant restorations.