The word "cranial prosthesis" is not a material specification. It is a marketing decision. And right now, it is being made without conscience. A growing number of products are being sold under the clinical title of cranial prosthesis while being constructed with industrial-grade silicone. Not medical-grade. Not biocompatibility-tested. Industrial silicone, the same class of material used in machinery, sealants, and manufacturing applications, is placed against the scalps of