Dr. S. asks:
We have many materials available to either form crowns or to cover a metal understructure (coping). Is there any difference in terms of force transmitted to the implant fixture? If the crowns are made of Targis/Vectris, for instance, since this is a softer material [Ed. Lower modulus of elasticity] than porcelain fused to metal, will this absorb some of the forces that would normally be directly transmitted to the implant fixture. We used to use porcelain teeth for dentures but most have now switched to acrylic because this results in less force transmission to the maxilla and mandible, reducing bone resoription in the long term. Should we consider similar paradigms for restoring implants with crowns and bridges?