When is the best time to repair the skull, which is a very important part of the human skeleton and an important protective barrier for the nerve centers. The skull is located above the crest and consists of 23 flat and irregular bones of different shapes and sizes (the three pairs of auditory tuberosities in the middle ear are not included). With the exception of the mandible and the hyoid bone, the bones are firmly connected to each other by sutures or cartilage and serve to protect and support the brain, the sensory organs, and the beginning of the digestive and respiratory apparatus. However, in reality, some accidents or craniosurgery sometimes cause defects in the skull, which also destroy this protective and supporting role and expose the brain and intracranial soft tissues to danger. Therefore, cranial repair is needed in a timely manner. So when is the best time for cranial repair? Generally speaking, for patients with open skull comminuted fractures with relatively clean wounds and no cranial hypertension, it is recommended to perform cranial repair in one stage; while for patients with severe closed craniocerebral trauma and giant cranial defects caused by decompression of large bone flaps performed for cranial hypertension, cranial repair should be performed about 3 months after surgery, or earlier if the recovery is better. Of course, in addition to the timing of repair, the material of cranial repair is also very important. If you choose an unsuitable material, you may have various adverse reactions later. Like some hospitals use titanium mesh materials, there are still various problems, some patients will have rejection reactions, resulting in the destruction of scalp tissue; some patients may occur postoperative infection, some will have scalp cutting injuries, ulcers, etc., and titanium mesh is not insulated, postoperative will be very sensitive to hot and cold environments. PEEK is a very advanced and ideal material for cranial repair that does not have all the problems associated with titanium mesh materials.