Immediate complete denture is suitable for patients whose anterior teeth cannot be preserved and whose posterior teeth are missing. If there are many posterior teeth, the posterior teeth should be extracted first, and only the anterior teeth and bicuspids with occlusal relationship should be kept as the basis for making immediate dentures and determining the jaw position relationship. Install the rear teeth on the lifting frame. The method and requirements of tooth arrangement are the same as those of complete denture. Try putting the teeth in the mouth to further check the occlusal relationship, and put them on the maxillary and mandibular models of the occlusal frame when appropriate.

Arrange the front teeth, you can cut off a plaster tooth, shave off the model, then arrange a denture and cut the teeth accordingly. Arrange the remaining teeth. You can also cut off the plaster teeth on one side at a time, shave off the model and then arrange the dentures on one side, and then arrange the teeth on the other side according to this method. This method is suitable for people whose original natural teeth are basically in normal position, and the alveolar bone on the labial and buccal sides is not concave, and no or only a small amount of alveolar bone dressing is needed.

After removing all the plaster and trimming the model, arrange the teeth. This method is suitable for those who need more dressing for alveolar bone. When arranging teeth, we can refer to the adjacent teeth and the opposite teeth with the same name, and keep the model as a reference to make the arrangement of artificial teeth close to the size, shape and position of the original natural teeth.

Methods of removing and trimming the model: Before removing the plaster teeth, mark the midline, tooth long axis, gingival line, gingival sulcus line and gingival sulcus depth on the model with a pencil about twice. When the alveolar bone is not trimmed, drill it from the middle of the tooth cutting edge to the neck of the tooth, and then infer the plaster tooth to the labial side or lingual side to avoid hurting the contact point of adjacent teeth. According to the depth of gingival pocket and alveolar bone absorption of X-ray film,

The shaving degree of model alveolar ridge. If the gingival sulcus is normal, the labial and buccal sides can be scraped by 2-3 mm, and the lingual side can be scraped without scraping or less, and the two inclined surfaces on the labial and lingual sides can be repaired into circular blunt alveolar ridges. If the X-ray after tooth extraction shows that the alveolar bone is absorbed more or the alveolar ridge needs to be trimmed, it can be scraped off as needed.

Felly's trisection principle divides the labial surface of alveolar ridge from gingival margin to vestibular sulcus into three parts, namely, gingival area 1/3, middle area 1/3 and bottom area 1/3. Lip scraping starts from the center of alveolar ridge to the labial side, including gingiva 1/3, and the gingival 1/3 scraping gradually decreases, while the bottom 1/3 is not scraped, and the lingual side is generally not scraped or scraped less.

In order to accurately trim alveolar bone after tooth extraction, transparent plastic guide plate can be made in advance. During the operation, if there is a sharp bony process, it is easy to detect it immediately. The manufacturing method of the surgical guide plate is to form a wax base on the trimmed model in a mold box, box it, and soak it in 0. 1% mercuric chloride solution for later use. After the immediate denture is completed, the tooth can be extracted surgically and the alveolar bone can be trimmed, with the principle of minimizing tissue trauma and preserving bone tissue. After the operation, remove the denture from the disinfectant and rinse it with normal saline. If the denture is not in place and the patient has pain in the mouth, it can be adjusted appropriately and the occlusion can be adjusted initially, and the patient should be informed of the matters needing attention after wearing the denture and the follow-up time.

1. It is best not to take off dentures within 24 hours after wearing them, so as not to affect the formation of thrombosis. There is edema in the tissue after operation, so it is difficult to wear it after taking off the denture. If the wound hurts, you can take painkillers or local cold compress.

2. Eat liquid or semi-liquid food within 24 hours after wearing it for the first time, so as not to stimulate the wound and cause pain.

3. Come to the hospital for reexamination the next day, take off the denture, wash the wound with warm salt water, understand the patient's wearing denture, modify the tender area and adjust the occlusion.

4.5 days later, the stitches were removed, and then the dentures were checked and modified.

5. Ask patients to review regularly. When there is a gap between the base and the alveolar ridge due to the absorption of alveolar bone, the retention of denture is unstable, resulting in tenderness, decreased chewing function and other symptoms, it is necessary to rearrange the lining and adjust the occlusion in time.

Lam found that the alveolar ridge in the anterior maxilla was rapidly absorbed one month after tooth extraction, and it was not moderately absorbed until five months after tooth extraction. Wic-torin observed that the residual alveolar ridge reached a stable shape 8- 12 months ago, and needed temporary lining and occlusal adjustment 5-6 months after wearing immediate denture, and needed lining or restoration 8- 12 months after tooth extraction.