The skull is a very important organ in our body, and it is very dangerous if a skull defect occurs. Some people may ask, “How can the skull be defective if it is such a hard bone? Yes, of course, it will not be damaged in general, but if there are some irresistible external forces, it is inevitable to damage the skull, such as falling objects, production safety accidents, traffic accidents, cranial surgery, etc., which may cause skull defects. The occurrence of cranial defect is a great threat to the health of the body, so cranial repair surgery should be performed in time. When it comes to surgery, many patients or family members may still have some concerns, such as some people ask whether there will be cranial bone repair surgery sequelae. In fact, there is no need for patients to worry about this issue. Cranial repair surgery does not produce sequelae, and the surgery itself does not damage the brain or the human body. The skull repair surgery is done outside the brain by exposing the perimeter of the skull defect under the scalp, and then placing the repair material in after the complete exposure. Therefore, cranial repair surgery does not produce the so-called sequelae. Currently, neurosurgery uses the most polyether ether ketone, or PEEK, material for cranial repair surgery, which can achieve ideal repair results. This special polymer material is gradually becoming the latest trend in cranial repair materials due to the good biocompatibility of the material, its ability to be complexly shaped, excellent mechanical properties, good protective properties, and high postoperative comfort.