Up to the description in the last paragraph, if you are a nurse, you should know that the root tip support of teeth was insufficient due to trauma, which led to pulp necrosis. However, pulp necrosis is usually seen 3-6 months after trauma, and you are eager to make porcelain crown, which leads to the cover-up of the lesion and the appearance of fistula in the later stage. It's also that the teeth are corroded and I don't even know it.

At present, the cost of root canal therapy is relatively uniform, generally below the 200 yuan per root. However, the cost of post crown is relatively flexible, so it is suggested to choose a moderate cobalt-chromium porcelain crown post crown. The post cost is about 200, and the crown is generally around 800 (Beijing).

This should be based on the availability of the current root. Since we are on the same working front, in fact, many things have been figured out and are easy to understand. The key of porcelain crown lies in the doctor's work, not in the material. Therefore, we should operate carefully and choose the indications reasonably.