I know chin implants are available in various materials such as silicone, goretex, and porex. I spoke to an implant doctor who uses only porex instead of silicone. As I understood it, the arguments for porex were:
- less bone resorption
- less risk of infection
- because of tissue ingrowth, the implant is more stable and less likely to migrate
- feels more like bone
- can be carved for custom fit
- less ...