Every day there are a lot of beauty seekers consulting me in various ways about chin contouring, it seems that it is a very necessary thing to do a little bit of science about chin plastic surgery. The chin plastic (chin plastic) surgery mainly includes the following types: 1, microplasty including hyaluronic acid (hyaluronic acid) injection, collagen injection, autologous fat injection. This method is suitable for patients with a mildly receding or short chin. Please note that this is by far the recognized safe and feasible solution. The growth factor injection and permanent one shot injection currently advertised on the market are definitely not legal and safe methods. The chin augmentation injection (chin augmentation) must be injected in a regular hospital, there are too many beauty seekers are “micro-plasticity”, “injection beauty” such words to the pit, think that injection is particularly safe, just any beauty salon, club can do, such ideas are really This is a big mistake. The substances injected into the human body are in a semi-solid state, so if allergies, rejection, infection and other adverse reactions occur with the human body, it is impossible to be completely removed. To make an analogy: human tissue is like a piece of tofu, the injected material is like a handful of sand, sprinkle a handful of sand on the tofu, want to take the sand clean again only to pluck out the tofu. And why hyaluronic acid and collagen are safe as injectable materials? Both of them are normal components of human tissue; secondly, they can be absorbed and degraded, and the degraded products are harmless to the human body. The same analogy: human tissue is like a piece of tofu, absorbable injectable material is like crushed ice particles, sprinkle a handful of crushed ice on the tofu, if you don’t want the crushed ice, just wait for the ice to melt, the tofu is still the original tofu. And autologous fat as its own tissue, the body will not produce rejection reaction at all, so it is also a safe filler. 2.Prosthetic chin augmentation Materials include silicone, tumescent, Medpor. this method is suitable for patients with receding chin, but no obvious shortening in the longitudinal direction. A comparison of the advantages and disadvantages of various materials is as follows: Silicone is the earliest used and most widely used prosthetic material in the head and face. Advantages: good chemical inertness, easy sterilization; easy removal due to the formation of the outer fiber capsule; low price and high resistance to infection. Disadvantages: no porous structure on the surface, easy to form the envelope, later easy to contracture deformation, displacement; long-term easy to cause bone resorption under the prosthesis; can not be vascularized. Expansion (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 in, so it cannot be vascularized and is weak against infection. Medpor (high-density porous polyethylene) – advantages: porous structure (pore diameter of about 150μm), can let enough tissue grow into, can be vascularized, the best tissue compatibility, not easy to cause bone resorption under the prosthesis; disadvantages: need titanium nail fixed, high price. 3, chin osteotomy including chin osteotomy, small titanium plate strong internal fixation, chin osteotomy narrowing, chin polishing. The osteotomy requires a high level of physician, so you must go to a tertiary care hospital for the surgery. This method is suitable for patients who have a longitudinal short chin, or who have a strong recession.