Chimera implants (Sili-Tex) come in a one-piece U-shape or oval model, are composed of ePTFE composite materials at the surface, and are biocompatible permanent chin implants similar to Medpor. The inner layer is mainly composed of hard silicone, and the outer layer is composed of Gore-Tex as the medium of contact and attachment to human tissues. Therefore, it firmly adheres to the skeleton and is less likely to dislocate. Nevertheless, as its surface is relatively smooth and soft and less resistant to foreign force collision than Medpor, it is usually considered as an alternative implant or a replacement for traditional silicone implants. Due to its relatively small size, the one-piece U-shape design is unable to enclose both sides of the chin like the Medpor two-piece implant. Moreover, despite the advantages in the ease of sculpting an exquisite and a sharp V-shaped chin and simple emplacement and low costs, Chimera implants cannot provide good support and elongation for an excessively retracted jaw bone or results are not as natural as those obtained using Medpor; therefore, it is less suitable for patients with poor congenital chin conditions.Generally speaking, Chimera implants can satisfy the common requirements of a majority of patients, and the materials ensure surgical safety and result stability.
The emplacement of Sili-Tex implants is similar to that of Medpor, but its incision can be reduced to within 1.5 cm. Through the incision at the lower gum, the periosteum is detached from the skin, and the appropriate Sili-Tex implant is emplaced and naturally fixated to the bone. However, for some patients with loose skin or an uneven jawbone, Dr. Chuang additionally fixates the implant with bone screws to ensure stable and prolonged surgical results.