Dental implant is a kind of artificial implant deeply implanted in the bone of teeth, which can bear normal chewing force and has almost the same function and appearance as natural teeth. Therefore, it is called the third pair of human teeth. Dental implants have the advantages of strong function, no need to polish, good retention, beautiful appearance, comfort and convenience, simple operation and so on. The material of dental implant is divided into two parts: root material and crown material. Dental crown materials can be handled flexibly according to patients' wishes, while root materials are strictly regulated. Hospital experts said that according to different materials, dental implants can be divided into five categories:

1. metal and alloy materials: including gold, 3 16L stainless steel (iron-chromium-nickel alloy), cast cocrmo, titanium and alloy, etc.

2. Ceramic materials: including biologically inert ceramics, bioactive ceramics, biodegradable ceramics, etc.

3. Carbon materials: including glassy carbon and low-temperature isotropic carbon.

4. Polymer materials: including acrylate, polytetrafluoroethylene and polyethylene.

5. Composite material: the combination of two or more of the above materials, such as spraying ceramics on the metal surface.

At present, the commonly used dental implant material is mainly titanium, and the coating is mainly titanium or titanium alloy. The physical and chemical properties of titanium are famous for its light weight, stainless and high strength processability. Titanium is widely used in dental implants, such as artificial bones and joints, heart valves, pacemakers and dental implants.