“Is a cranial defect afraid of heat and what harm does it do to the brain?” Many patients are concerned about the dangers of cranial defects, such as whether they are afraid of heat and what damage they can do to the brain, after they have suffered a cranial defect for a variety of reasons. Here is an answer to these common patient concerns. Cranial defects can be very harmful, not only to the brain, but also in the whole body may show a series of uncomfortable symptoms, called “cranial defect syndrome”. How does a cranial defect damage the brain? Cranial defects are very common in neurosurgery clinics, and can be caused by trauma such as traffic accidents, workplace accidents, falling from height, or left over after craniotomy for intracranial tumors, cerebral hemorrhage, and other cranial diseases. What is the damage to the brain caused by cranial defects? The harm of cranial defect lies in destroying the integrity of the skull, the closure of the cranial cavity and the stability of the intracranial environment, thus causing cerebrospinal fluid circulation and blood circulation obstacles, affecting the normal operation of the nerve function and causing a series of neurological symptoms. Some patients may manifest as dizziness, headache, limb weakness, poor fine activities, weakened vision, emotional instability, irritability and so on. Is craniosynostosis a fear of heat? As for whether cranial defects are afraid of heat, we have not encountered any patients reflecting this kind of situation in clinical work, and there are no relevant reports in the literature. However, there is a common fear of heat in patients who have used titanium mesh for cranial defects, and these patients tend to be afraid of heat. Because titanium mesh is a metal material with strong thermal conductivity, if the external environment is hot, it is easy to conduct through the titanium mesh to the skull, and if under strong sunlight, there may even be burning, burning sensation. In addition, it is because of the heat conduction effect of titanium mesh material, titanium mesh repair of the skull after the patient will also be more afraid of cold. In addition, titanium mesh skull repair has some other defects and shortcomings, such as postoperative infection, rejection, wear and tear of the scalp, titanium mesh exposed, easy to deformation and collapse, affecting the CT, MRI examination and so on. Therefore, the use of titanium mesh material for cranial bone repair is not very recommended at present? How to repair cranial defects? The repair of cranial defects requires the selection of excellent repair materials and high requirements for surgical techniques. At present, there is a new type of special polymer material – polyether ether ketone PEEK material, the performance is very excellent, PEEK material does not conduct heat, the patient will not be afraid of heat and cold, in addition, the hardness, stiffness, strength, elasticity, tissue compatibility of PEEK material is comparable to the autologous skull, which can be very good to overcome the above problems that may arise from the titanium mesh material. In addition, the hardness, stiffness, strength, elasticity, and tissue compatibility of PEEK materials are comparable to those of autologous skulls, which can well overcome the above-mentioned problems of titanium mesh materials, and become a new trend of cranial repair materials. Our team is currently using this advanced PEEK material extensively and has excellent surgical skills. The team constantly improves and upgrades the technology and optimizes the design of the material, and currently has 4 technical innovations, and innovatively introduces the concept of cosmetic plastic surgery, so as to comprehensively carry out PEEK cranial bone repair and plastic surgery, which can achieve the organic unity of anatomical integrity, perfect function, and beautiful appearance, and has been highly praised by the majority of patients and their families and praises.