Physical properties of a silicone prosthetic elastomer stored in simulated skin secretions

Polyzois, GL; Tarantili, PA; Frangou, MJ; Andreopoulos, AG

dc.contributor.author	Polyzois, GL	en
dc.contributor.author	Tarantili, PA	en
dc.contributor.author	Frangou, MJ	en
dc.contributor.author	Andreopoulos, AG	en
dc.date.accessioned	2014-03-01T01:50:07Z
dc.date.available	2014-03-01T01:50:07Z
dc.date.issued	2000	en
dc.identifier.issn	0022-3913	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25998
dc.subject.classification	Dentistry, Oral Surgery & Medicine	en
dc.subject.other	MAXILLOFACIAL ELASTOMERS	en
dc.title	Physical properties of a silicone prosthetic elastomer stored in simulated skin secretions	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	Statement of problem, Facial prostheses worn over an extended time are exposed to to various environmental factors, including sebaceous oils (sebum) and perspiration. Purpose. This study investigated the physical properties of tensile strength and modulus, elongation, tear strength, hardiness, weight, and color change, of a silicons facial elastomer after immersion for 6 months in simulated sebum and perspiration at 37 degrees C. Material and methods, Specimens made of Episil silicone elastomer were immersed in simulated alkaline or acidic perspiration as well as in sebum. Tensile and tear tests were conducted according to ISO specification no. 37 and 39, respectively, in a Monsanto testing machine. Shore A hardness measurements were run according to ASTM D 2240. Weight changes were followed at 5, 15, 30, and 180 days, and color changes were determined in the CIE LAB system using a tristimulus colorimeter. Results. An improvement of mechanical properties for specimens immersed in acidic perspiration was attributed to facilitation of the propagation of cross-linking reaction during aging of the silicone samples. Some weight increase was observed for the specimens immersed into the aqueous solution, whereas for those immersed in sebum, weight loss was recorded, probably because of extraction of some compounds. In this latter case, the color change was lon er than that corresponding to simulated perspiration. Conclusion. The silicone specimens aged for a period, which simulates 1.5 years of clinical service, showed minimal changes with respect to the properties studied.	en
heal.publisher	MOSBY-YEAR BOOK INC	en
heal.journalName	JOURNAL OF PROSTHETIC DENTISTRY	en
dc.identifier.isi	ISI:000087051700016	en
dc.identifier.volume	83	en
dc.identifier.issue	5	en
dc.identifier.spage	572	en
dc.identifier.epage	577	en