When is the time for cranial repair? Accidental impacts in life can lead to missing bones in the human skull. Once such an accident occurs, the brain tissue inside the skull loses its protective shell and comes into direct contact with the external environment, and is also susceptible to invasive infections from the adverse environment. Cranial bone repair is necessary after a skull defect, so when is the best time to repair the skull? Once the skull is damaged, the patient must go to the hospital as soon as possible to receive examination and repair surgery. Otherwise, it is easy to cause the patient’s own burden of thought, and may be accompanied by symptoms such as headache and dizziness. The longer the duration of the defect, the higher the chance of secondary brain damage occurring. Repair surgery is performed after 3 months of cranial defect, in which the pressure at the defect site is not high and there are no infections, ulcers or other factors that are unfavorable to the healing of the incision. Therefore, this is the most pointed period for surgery. The ideal material for restoration is PEEK. The three-dimensional reconstruction technology of this material can perfectly restore the physiological structure of the skull according to the patient’s cranial CT data, and accurately fit the defective bone window. In addition, the performance of this material in terms of elasticity, thermal insulation, hardness, stability and other aspects is comparable to the autologous skull, which is a perfect cranial bone substitution material, and does not have a foreign body reaction, and will not affect the interference with the future radiological examination. It will also not affect the airplane ride, security check and so on.