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Evaluation of the Shore A Hardness of Silicone for Facial Prosthesis as to the Effect of Storage Period and Chemical Disinfection

Guiotti, Aimée Maria DDS, MD, PhD*; Goiato, Marcelo Coelho DDS, MD, PhD; dos Santos, Daniela Micheline DDS, MD, PhD

Journal of Craniofacial Surgery: March 2010 - Volume 21 - Issue 2 - p 323-327
doi: 10.1097/SCS.0b013e3181cf5fa4
Original Articles

The failure of facial prostheses is caused by limitations in the properties of existing materials, especially flexibility and durability. Therefore, this study evaluated the Shore A hardness of silicone used for fabrication of facial prostheses, Silastic MDX4-4210, according to the influence of storage period, daily disinfection, and 2 types of pigmentation. Thirty specimens were fabricated and divided in 3 groups: colorless, pigmented with makeup, and pigmented with iron oxide. Analysis of results was assessed on a Shore A hardness meter immediately, 6 months, and 1 year after fabrication of specimens, following the guidelines of the American Society for Testing and Materials. The hardness values were statistically analyzed by the Tukey test. The silicone exhibited an increase in hardness with time. However, the hardness was stable from 6 months to 1 year. It was concluded that the silicone is within the values of Shore A hardness reported in the literature, regardless of the storage period, pigmentation, and chemical disinfection.

From the *Department of Dental Materials and Prosthodontics, Santa Fé do Sul Dental School, Faculdades Integradas de Santa Fé do Sul, Santa Fé do Sul; and †Department of Dentistry Materials and Prosthesis, University of the State of São Paulo, São Paulo, Brazil.

Received September 9, 2009.

Accepted for publication October 26, 2009.

Address correspondence and reprint requests to Marcelo Coelho Goiato, DDS, MD, PhD, Department of Dental Materials and Prosthodontics, UNESP-Araçatuba Dental School, José Bonifácio, 1193, Araçatuba, São Paulo, Brazil, 16015-050; E-mail:

© 2010 Mutaz B. Habal, MD