Development of Improved Materials for Extraoral Maxillofacial Prostheses

摘要

An arylene silicone polymer, polytetramethylsilphenylenesiloxanedimethylsiloxane was synthesized and formulated as a pourable, viscous, room-temperature-vulcanizing liquid for use in fabricating extraoral maxillofacial prostheses. Silphenylene polymers are colorless and will accept either intrinsic or extrinsic coloration. When mixed with conventional catalysts, the silphenylene vulcanizates can be easily and reliably cast in closed dental stone molds to give strong yet soft and pliable prostheses. Typical values for tensile strength, elongation at break, modulus at 100% elongation, and hardness are, respectively, 1400 psi, 1000%, 50 psi and 35 (Shore A). The silphenylene elastomers have an excellent tactual, as well as visual resemblance to skin, and they adhere well to medical tapes and adhesives. Animal tests indicate that the dermal and ocular toxicity of the components of the silphenylene clinical kits and the cured elastomer are low. Clinical evaluation showed silphenylene to be an improved prosthetic material with the possibility of widespread use if the tear strength were improved.