Titanium skulls are now the mainstream material for repairing cranial defects. Of course, there are times when autologous skulls or grafts can be used, but this is relatively more costly and produces relatively more complications. On the plus side, titanium alloys are inert metals, rarely produce rust or other reactions, reducing the mechanism of abnormal reactions with the body. Then again, it is easy to obtain and is relatively strong, and is usually individualized through pre-operative 3D scanning, which allows it to conform perfectly to the shape of the head. Of course there are some drawbacks, such as rejection, which is very rare, but occasionally occurs in a few people. After the skull repair, it is not invulnerable to poison, but also may produce intracranial infection, and if the cut does not heal without appropriate maintenance at a later stage, it may also produce titanium skull exposure, then the skull needs to be removed for retreatment, so there are advantages and disadvantages, and the choice must be made according to the specific condition.