Cranial bone is one of the hardest bone tissues in the human body, which is responsible for protecting the brain tissue and maintaining the normal intracranial environment, so if the cranial bone is damaged, it will be very harmful to the health of the body and should be repaired in time. However, in the real world, cranial defects are a very common disorder with a large number of patients. There are various factors leading to cranial defects, such as traffic accidents are one of the more common causes. A significant percentage of patients with craniosynostosis are left with craniosynostosis after a traffic accident that resulted in cranial injury and required craniotomy. There are also cranial defects caused by production safety accidents, craniosurgery or their own cranial lesions. Cranial defects are very dangerous and may lead to a series of syndromes. Firstly, the defect in appearance will cause the brain tissue to be vulnerable to external injury, and also cause some fear or low self-esteem to the patient; secondly, the change of intracranial environment caused by cranial defect will affect the operation of various intracranial life activities, including the circulation of cerebral crest fluid, blood circulation, the operation of brain nerve function and so on. Therefore, it is very necessary to repair the skull defect in time. Cranial repair surgery is a very routine surgical procedure, and the choice of repair materials is very important. Some people ask how to use Johnson & Johnson material for skull repair. In fact, the most ideal material for cranial repair is PEEK, or polyether ether ketone material, which is a special polymer material with excellent physical and chemical properties, and has gradually become the latest trend in cranial repair materials in recent years.