Effects of storage in simulated skin secretions on mechanical behavior and color of polydimethylsiloxanes elastomers

Eleni, PN; Krokida, MK; Polyzois, GL

dc.contributor.author	Eleni, PN	en
dc.contributor.author	Krokida, MK	en
dc.contributor.author	Polyzois, GL	en
dc.date.accessioned	2014-03-01T01:35:37Z
dc.date.available	2014-03-01T01:35:37Z
dc.date.issued	2011	en
dc.identifier.issn	1049-2275	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21122
dc.subject	Color changes	en
dc.subject	maxillofacial prostheses	en
dc.subject	mechanical properties	en
dc.subject	PDMS	en
dc.subject	skin secretions	en
dc.subject.classification	Surgery	en
dc.subject.other	baysilon	en
dc.subject.other	dimeticone	en
dc.subject.other	elastomer	en
dc.subject.other	absorption	en
dc.subject.other	analysis of variance	en
dc.subject.other	article	en
dc.subject.other	chemistry	en
dc.subject.other	color	en
dc.subject.other	elasticity	en
dc.subject.other	hardness	en
dc.subject.other	immersion	en
dc.subject.other	materials testing	en
dc.subject.other	maxillofacial prosthesis	en
dc.subject.other	pH	en
dc.subject.other	physical chemistry	en
dc.subject.other	sebum	en
dc.subject.other	sweat	en
dc.subject.other	time	en
dc.subject.other	Absorption	en
dc.subject.other	Analysis of Variance	en
dc.subject.other	Color	en
dc.subject.other	Dimethylpolysiloxanes	en
dc.subject.other	Elasticity	en
dc.subject.other	Elastomers	en
dc.subject.other	Hardness Tests	en
dc.subject.other	Hydrogen-Ion Concentration	en
dc.subject.other	Immersion	en
dc.subject.other	Materials Testing	en
dc.subject.other	Maxillofacial Prosthesis	en
dc.subject.other	Physicochemical Phenomena	en
dc.subject.other	Sebum	en
dc.subject.other	Sweat	en
dc.subject.other	Time Factors	en
dc.title	Effects of storage in simulated skin secretions on mechanical behavior and color of polydimethylsiloxanes elastomers	en
heal.type	journalArticle	en
heal.identifier.primary	10.1097/SCS.0b013e31820f36e0	en
heal.identifier.secondary	http://dx.doi.org/10.1097/SCS.0b013e31820f36e0	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	Background: Among the deteriorations that occur in maxillofacial prosthesis due to exposure in various environmental factors, sebaceous oils (sebum) and perspiration are also responsible for several alterations. Purpose: Mechanical properties and color changes of 3 different medical-grade polydimethylsiloxanes were investigated in this study (Elastomer 42, Techsil 25, and M511), after immersion for 6 months in simulated sebum and perspiration at 37°C. The purpose of this study was to determine the effects of storage in their physical properties. The null hypothesis investigated was that immersion time did not affect the measured properties. Methods: Polydimethylsiloxane specimens were immersed in simulated perspiration and in sebum. Compression tests were conducted on a Zwick testing machine. Shore A hardness measurements were carried out in a CV digital Shore A durometer. Weight changes were measured, and color changes were determined in the CIELAB system, using a MiniScan XE spectrophotometer. Simple mathematical models were developed to correlate the measured properties with the immersion time. The data were analyzed by analysis of variance and Tukey multiple range test at a level of α = 0.05. Results: Specimens immersed in simulated skin secretions became harder because of facilitation of the propagation of cross-linking reaction that probably occurred during aging of the polydimethylsiloxane samples, except for Elastomer 42, which seems to become more soft and ductile after immersed in sebum. Some weight increase was observed for the specimens immersed into the aqueous solutions, whereas for those immersed in sebum, weight loss was recorded, probably because of extraction of some compounds. The color change was higher for the specimens immersed in sebum than that corresponding to simulated perspiration. According to statistical analysis, all measured properties changed significantly after immersion in simulated perspiration and in sebum. Moreover, mathematical models reveal major alterations as well, which were introduced through their constants. Thus, the hypothesis investigated was rejected. Conclusions: Significant changes were observed in all the examined elastomers. The elastomers were aged for a period, which simulates 1.5 years of clinical service. Within the limitation of this study, concerning the mechanical behavior and mostly the color changes, sebum and perspiration greatly affect the examined elastomers. Copyright © 2011 by Mutaz B. Habal, MD.	en
heal.publisher	LIPPINCOTT WILLIAMS & WILKINS	en
heal.journalName	Journal of Craniofacial Surgery	en
dc.identifier.doi	10.1097/SCS.0b013e31820f36e0	en
dc.identifier.isi	ISI:000290732100015	en
dc.identifier.volume	22	en
dc.identifier.issue	3	en
dc.identifier.spage	830	en
dc.identifier.epage	836	en