? Dental implants can be divided into delayed dental implants and immediate dental implants according to the timing of implantation. At present, delayed dental implantation is widely used in clinic, that is, after the extraction wound heals for 3-6 months, the implant is implanted on the healthy alveolar ridge, and the denture is repaired after bone fusion for 3-6 months. Immediate dental implantation refers to simultaneous implantation of implants after tooth extraction, that is, immediate implantation of implants in fresh tooth extraction wounds. A large number of experiments and clinical studies have confirmed that immediate implantation can achieve successful osseointegration as well as delayed implantation. Dental implant experts said that immediate dental implant has the advantages of short repair time, strong chewing function, good stability, comfort and convenience, beautiful color and so on. Doctors can make dental crowns according to the patient's face and the shape and color of other teeth to achieve the best overall coordination and aesthetics. Immediate dental implantation shortens the course of treatment and relieves the pain of patients. Just like traditional dental implants, immediate dental implants rely on their own artificial roots to repair, and there is no need to polish the healthy teeth next to them, without any harm to the teeth. Immediate implantation can effectively reduce the physiological absorption of alveolar bone and avoid massive bone grafting or reconstruction caused by insufficient bone mass in the implantation area. The artificial root of immediate dental implant is closely combined with alveolar bone and takes root in the mouth like a real tooth, with strong retention and stability; In addition, because the traditional dental clasp or braces are not used, the patient's oral cavity has no foreign body sensation, which is very comfortable and convenient, and is conducive to keeping the oral cavity clean and hygienic. Immediate dental implantation is beneficial to implant the implant into the ideal anatomical position, which makes it more in line with biomechanical requirements. Immediate implantation is beneficial to maintain the shape of gingiva and obtain ideal aesthetic effect.