At present, chin augmentation, commonly known as “chin pad” surgery, there are three main types of implants to choose from: silicone, tumescent, and MEDPOR. Silicone is the earliest and most widely used implant material in the head and face. Advantages: it is safe, easy to remove, cheap; Disadvantages: easy to form the envelope, later easy to contracture deformation, displacement; long-term easy to cause bone resorption under the prosthesis. Because silicone is a non-porous structure, placed in the body, the human tissue will produce a fiber envelope to wrap the silicone, with the passage of time, the envelope of some patients will become more and more after more and more hard, resulting in the bone beneath the prosthesis is compressed absorption and prosthetic deformation. Tumescent (expanded polytetrafluoroethylene) Advantages: porous structure, pore size ranging from 5 to 30 μm, microporous structure allows the tissue to grow into the soft, histocompatible. Disadvantages: small pore size allows only a small amount of tissue to grow into, so it can not be vascularized, weak resistance to infection. In layman’s terms, the expansion is porous structure, allowing a certain amount of tissue to grow into, but its pore size is not large enough, so some of the body’s anti-bacterial immune cells do not have access to the pore size, in case of bacteria into the microporous, the body has no way to kill bacteria, it is easy to infection, which is its biggest drawback. Medpor (high-density porous polyethylene) Advantages: porous structure (pore diameter of about 150μm), allows enough tissue to grow into, can be vascularized, the best histocompatibility, not easy to cause bone resorption under the prosthesis; Disadvantages: requires titanium nail fixation, high price. This material is more expensive, in our hospital currently a piece will be nearly 7000 yuan. But because Medpor is a porous structure and can be vascularized, it is resistant to infection; and causes far less bone resorption below the prosthesis than silicone.