When one incisor is knocked out, if it’s just a crown fracture, it’s usually enough to get just one all-porcelain tooth. However, if it is a crown root fracture, or the tooth can not be retained, you may need other front teeth to do all-porcelain teeth for fixed bridge repair. 1. Incisor knocked out if the defect is small, you can adjust the sharp edges of the grinding, there are sensitive symptoms can be desensitization treatment. Then filling, do not necessarily need to carry out all-porcelain teeth. 2. If the pulp is involved, root canal treatment is needed, and crown restoration is carried out after treatment. Front teeth because of the aesthetics involved, generally can use porcelain or all-ceramic teeth repair. Generally only one all-ceramic tooth can be done. 3. But if the crown root fracture, or the tooth can not be retained, you may need other front teeth to do all-porcelain teeth for fixed bridge repair. Specific recommendations to consult a professional doctor.