the purpose of this program is to develop ultrasoft composite materials to be used as fillers in the fabrication of maxillofacial prostheses. the projected composite systems are elastomeric-shelled, liquid-filled microcapsules. experiments continued on the interfacial polymerization process with spherical, sealed capsules achieved needs identified are non-inhibition of curing of matrix materials, less diffusion of core liquid through capsule walls, and smaller capsules. (author)