Abstract
A facial prosthesis may have various problems with regard to retention. The use of osseointegrated implants improves retention, however, the implants are not permitted to be used for facial prostheses under the Pharmaceutical Affairs Law in Japan. Hence, the Japan Academy of Maxillofacial Prosthodontics proposed to develop a new silicone material with better characteristics for application to facial prostheses.
The aim of this study was to investigate the recovery from deformation and elongation of new silicone materials for facial prostheses. The permanent deformation of new silicone materials （KRS-10 and KRS-C1 manufactured by GC Co., Ltd. and conventional silicone material A-2186F manufactured by Factor Ⅱ） were recorded by tensile testing.
The rate of change at permanent deformation in KRS-10, KRS-C1, and A-2186F were 0.71±0.20％, 0.19±0.18％, and 0.73±0.18％ （ave.±SD）, respectively. Because an adhesive agent creates a large tensile stress while detaching, KRS-C1 would show better characteristics of recovery from deformation and elongation.
It is suggested that further improvement regarding recovery from deformation and elongation is required for the daily use of facial prostheses.
