Section 882.5320 - Preformed alterable cranioplasty plate(a)Identification. A preformed alterable cranioplasty plate is a device that is implanted into a patient to repair a skull defect. It is constructed of a material, e.g., tantalum, that can be altered or reshaped at the time of surgery without changing the chemical behavior of the material.(b)Classification. Class II (performance standards).