Titanium cranial bone is one of the most commonly used materials to repair cranial defects. It is usually shaped precisely by computer according to the shape of the contralateral skull, made into a titanium mesh plate, and then firmly fixed on top of the skull around the skull defect using 10-20 self-tapping screws. Titanium alloy is strong, biocompatible and corrosion resistant. It can be carried and used for life without fear of deformation, dislodgement and other accidents, unless the head has been violently hit. How many years do titanium screws last? Titanium is the only metal in all metals that has the most affinity to the human body, and when combined with human bones, it does not produce any rejection reaction and does not cause any harm to the human body. If a fracture is fixed with a titanium screw, the fracture has already healed and the screw is located in the femoral head, there is no jamming on the surrounding soft tissues and nerves, so it will not have any effect on the human body and can stay in the body permanently. At present, titanium alloy material is often used in orthopedics, brain surgery, maxillofacial surgery, etc. For example, some of the artificial joints used in orthopedics are made of titanium alloy, and titanium alloy plates are also needed for maxillofacial and cranial bone repair, and these titanium alloy materials need to stay in the body permanently without any effect on the human body, so there is no problem of the longevity of titanium alloy screws. Can skull repair with titanium alloy still pass the security check? Titanium material is a large metal material, and patients will have some rattling when they go through the security check, so when patients need to go through the security check when they go out, it is better to carry the medical diagnosis certificate with them and then show it to the security personnel. The efforts of medical researchers have resulted in a new type of cranial repair material being used clinically, and that is PEEK. The material is known as polyether ether ketone, a polymer biomaterial that is extremely close to human cranial bone in terms of elasticity, heat transfer, stiffness, and stability. Numerous clinical cases have shown that there are no discomfort or complications associated with PEEK cranial repair materials, so PEEK is currently the better choice for cranial repair. In biocompatibility, PEEK far exceeds titanium mesh, with elastic modulus, strength, thermal insulation, and stability similar to autologous cranial bone, and the use of three-dimensional shaping to create an ancient plate that can precisely match the original cranial bone structure, which is the key to successful surgery. So we must understand clearly the choice of material for cranial repair, patients with cranial defects need to be determined according to the onset of the disease when cranial repair, and regular hospitals will provide correct advice and guidance on the cranial repair material for patients with the disease.