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A new RTV silphenylene maxillofacial prosthetic material
132
J. Prosthet. February.
Krajicek
Dent. 1977
References 1. Hunter, J.: The Natural History of the Human Teeth, London, 1778, Printed for J. Johnson, p. 124. 2. Taichman, N. S.: Some Perspectives on the Pathogenesis of Periodontal Disease, J. Periodontol. 45: 361-363, 1974. 3. Greene, J. C.: The Ease for Preventive Periodontics, J. Dent. Child. 42: 24-27, 1975. 4. Bureau of Economic Research and Statistics, ADA: Growth in Population and Number of Dentists to 1985, J. Am. Dent. Assoc. 87: 901-903, 1973. 5. World Almanac, New York, 1976, Newspaper Enterprise Association, Inc. 6. Statistical Abstracts of the United States, United States Department of Commerce, Social and Economic Statistics Administration, Bureau of the Census, Washington, D. C., 1974. 7. Edentulous Persons Publication M. (HRA) 74-1516, United States Department of Health, Education and Welfare, National Center for Health Statistics, Rockville, Md., 1974. 8. Bureau of Economic Research and Statistics, ADA: Survey of Denture Wearers, 1976. 9. Yoshizumi, D. T.: An Evaluation of Factors Pertinent to the Success of Complete Denture Service, J. PROSTHET. DENT. 14: 866-878, 1964. 10. Craddock, F. W.: Prosthetic Dentistry, ed. 3, London, 1956, Henry Kimpton, p. 411. Il. Schlosser, R. 0.: Complete Denture Prosthesis, Philadelphia, 1940, W. B. Saunders Company, p. 290. VETERANS
ADMINISTRATION
KERRVILLE,
TEXAS
HOSPITAL
78028
IADR A new
RTV silphenylene
PROSTHODONTIC maxillofacial
D. H.
Lewis, D. R. Cowsar, Institute, Birmingham, Ala.
A. C. Tanquary,
ABSTRACT
prosthetic
material
and
R. Tarwater.
0.
Southern
Research
An improved elastomer with an optimum balance of mechanical properties, processability, environmental stability, colorability, and esthetics, for use in fabricating extraoral maxillofacial prostheses, was sought. An arylene silicone polymer, polytetramethylsilphenylenesiloxanedimethylsiloxane, was synthesized and formulated as a pourable, viscous, room-temperature-vulcanizing liquid. 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 prostheses that are strong and tough yet soft and pliable. Typical values for tensile strength, elongation at break, modulus at 100% elongation, and hardness are, respectively, 1400 psi, 1000 psi, 50 psi, and 35 (Shore A). Since the arylene linkages in the silphenylene polymers impart unusually high values of surface energy to these silicone elastomers, they have an excellent tactual as well as visual resemblance to skin, and they adhere well to tapes and adhesives. A preclinical toxicologic evaluation has been completed, and the materials are currently undergoing clinical evaluation. This
study
was supported
Reprinted from the editor, and the American
Journal Dental
by NIH-NIDR
of Dental Association
Contract Research (copyright
No. NOI-DE-42435. with permission holder).
of the
author,
the
J. Prosthet. February.
Krajicek
Dent. 1977
References 1. Hunter, J.: The Natural History of the Human Teeth, London, 1778, Printed for J. Johnson, p. 124. 2. Taichman, N. S.: Some Perspectives on the Pathogenesis of Periodontal Disease, J. Periodontol. 45: 361-363, 1974. 3. Greene, J. C.: The Ease for Preventive Periodontics, J. Dent. Child. 42: 24-27, 1975. 4. Bureau of Economic Research and Statistics, ADA: Growth in Population and Number of Dentists to 1985, J. Am. Dent. Assoc. 87: 901-903, 1973. 5. World Almanac, New York, 1976, Newspaper Enterprise Association, Inc. 6. Statistical Abstracts of the United States, United States Department of Commerce, Social and Economic Statistics Administration, Bureau of the Census, Washington, D. C., 1974. 7. Edentulous Persons Publication M. (HRA) 74-1516, United States Department of Health, Education and Welfare, National Center for Health Statistics, Rockville, Md., 1974. 8. Bureau of Economic Research and Statistics, ADA: Survey of Denture Wearers, 1976. 9. Yoshizumi, D. T.: An Evaluation of Factors Pertinent to the Success of Complete Denture Service, J. PROSTHET. DENT. 14: 866-878, 1964. 10. Craddock, F. W.: Prosthetic Dentistry, ed. 3, London, 1956, Henry Kimpton, p. 411. Il. Schlosser, R. 0.: Complete Denture Prosthesis, Philadelphia, 1940, W. B. Saunders Company, p. 290. VETERANS
ADMINISTRATION
KERRVILLE,
TEXAS
HOSPITAL
78028
IADR A new
RTV silphenylene
PROSTHODONTIC maxillofacial
D. H.
Lewis, D. R. Cowsar, Institute, Birmingham, Ala.
A. C. Tanquary,
ABSTRACT
prosthetic
material
and
R. Tarwater.
0.
Southern
Research
An improved elastomer with an optimum balance of mechanical properties, processability, environmental stability, colorability, and esthetics, for use in fabricating extraoral maxillofacial prostheses, was sought. An arylene silicone polymer, polytetramethylsilphenylenesiloxanedimethylsiloxane, was synthesized and formulated as a pourable, viscous, room-temperature-vulcanizing liquid. 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 prostheses that are strong and tough yet soft and pliable. Typical values for tensile strength, elongation at break, modulus at 100% elongation, and hardness are, respectively, 1400 psi, 1000 psi, 50 psi, and 35 (Shore A). Since the arylene linkages in the silphenylene polymers impart unusually high values of surface energy to these silicone elastomers, they have an excellent tactual as well as visual resemblance to skin, and they adhere well to tapes and adhesives. A preclinical toxicologic evaluation has been completed, and the materials are currently undergoing clinical evaluation. This
study
was supported
Reprinted from the editor, and the American
Journal Dental
by NIH-NIDR
of Dental Association
Contract Research (copyright
No. NOI-DE-42435. with permission holder).
of the
author,
the