Development of Improved Materials for Extraoral Maxillofacial Prosthesis.

摘要

The report covers the second year of work towards the development of improved materials for extraoral maxillofacial prosthesis. The first year on the contract defined two materials C-4polycarbonate/silicone block copolymer and a styrene/ethylene-butylene/styrene block copolymer as having a superior balance of properties relative to state of the art materials. Fabrication problems were observed and,therefore,were studied in the second year of the contract. Vacuum molding and emulsion casting techniques were developed but were found to be inferior to solution casting techniques. The composite of C-4polycarbonate/silicone rubber prosthesis skins with silicone rubber foam as the interior yielded lightweight tough prostheses. Relative to RTV silicone rubber,the fabrication route for the product defined above is considerably more difficult and shrinkage problems exist with larger moldings. The fabrication difficulty was considered serious enough such that clinical evaluations were not initiated. Color illustrations reproduced in black and white.