Implantech® Associates Inc. of Ventura, California have been manufacturing a complete line of sterile silicone facial implants since 1989. The company specialises in expanded-PolyTetraFluoroEthylene implants (PTFE being more commonly known as Teflon®)
Take for example their ePTFE-Coated Extended Anatomical Chin.
They are available in Small, Medium, Large and X-Large.
A selection of before-and-after photos of their chin implants can be seen here.
Improbable invites readers to comment on possible advantages (other than aesthetic) of a Teflon chin