Disadvantages of Zirconia Dental Implants
Zirconium implants (the implant body and the post or abutment) on the other hand, are made as one piece. Therefore, the only option for the prosthetics is to cement the teeth into place. Secondly, there is very little room for error—one has to be very careful not to place an implant at an improper location or angle. Therefore surgical placement and volume of bone is absolutely critical.
With titanium implants, I am often able to place the implant, leave it buried under the gums and graft the area simultaneously. If it had been a zirconium implant which sticks above the gums, the ability to graft would be reduced or risky, and may need to do a separate procedure first to ensure the bone is 100%.
Both types of implants require several months for the bone to fuse or grow against the implant before we can place the final teeth. With one-piece zirconia implants, this healing phase can be a little more tricky as we cannot bury the implant under the gum tissue. if there is pressure or movement of the implant, it will not osseointegrate.
Another concern is the long-term strength. We no longer see fracture of titanium implants since the alloys were introduced, but zirconia implants have been known to fracture. If this occurs, usually the only option is to remove them and that can create a large defect in the bone. The smaller diameter implants (3.25 mm) are at the greatest risk. Therefore anyone with heavy function (clenching or grinding) probably would not be an ideal candidate for zirconia.