THE CONNECTING BAR MATERIAL
Several materials have been investigated in vitro such asĀ : titanium, cobalt-chromium, PEEK, fiber-reinforced resin, and zirconia. One study using a finite element model observed that CB material (cobalt-chromium, grade 4 or 5 titanium, and zirconia dioxyde) does not seem to have any mechanical effects on the bone (6).
With 4 mandibular implants, the fiber-reinforced resin CBs seem to deliver less stress to the implants and the peri-implant bone compared to the cobalt-chromium bars (either machined or fabricated conventionally) and the titanium machined bars (13).
The plastic clips seem to exert less tension forces than the gold clips on the prosthetic screws and the peri-implant tissues (9).