Section 882.5300 - Methyl methacrylate for cranioplasty(a)Identification. Methyl methacrylate for cranioplasty (skull repair) is a self-curing acrylic that a surgeon uses to repair a skull defect in a patient. At the time of surgery, the surgeon initiates polymerization of the material and forms it into a plate or other appropriate shape to repair the defect.(b)Classification. Class II (performance standards).