Effect of time passage on some physical properties of silicone maxillofacial elastomers

Polyzois, GL; Eleni, PN; Krokida, MK

dc.contributor.author	Polyzois, GL	en
dc.contributor.author	Eleni, PN	en
dc.contributor.author	Krokida, MK	en
dc.date.accessioned	2014-03-01T02:01:58Z
dc.date.available	2014-03-01T02:01:58Z
dc.date.issued	2011	en
dc.identifier.issn	10492275	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29275
dc.subject	Color changes	en
dc.subject	Maxillofacial elastomers	en
dc.subject	Tear	en
dc.subject	Tensile	en
dc.subject	Time passage	en
dc.subject.other	silastic	en
dc.subject.other	article	en
dc.subject.other	chemistry	en
dc.subject.other	color	en
dc.subject.other	hardness	en
dc.subject.other	light	en
dc.subject.other	materials testing	en
dc.subject.other	maxillofacial prosthesis	en
dc.subject.other	nonparametric test	en
dc.subject.other	prosthesis	en
dc.subject.other	tensile strength	en
dc.subject.other	time	en
dc.subject.other	Young modulus	en
dc.subject.other	Color	en
dc.subject.other	Elastic Modulus	en
dc.subject.other	Hardness	en
dc.subject.other	Light	en
dc.subject.other	Materials Testing	en
dc.subject.other	Maxillofacial Prosthesis	en
dc.subject.other	Prosthesis Coloring	en
dc.subject.other	Silicone Elastomers	en
dc.subject.other	Statistics, Nonparametric	en
dc.subject.other	Tensile Strength	en
dc.subject.other	Time Factors	en
dc.title	Effect of time passage on some physical properties of silicone maxillofacial elastomers	en
heal.type	journalArticle	en
heal.identifier.primary	10.1097/SCS.0b013e31822e5e62	en
heal.identifier.secondary	http://dx.doi.org/10.1097/SCS.0b013e31822e5e62	en
heal.publicationDate	2011	en
heal.abstract	OBJECTIVES: Changes in color and other physical properties of silicone facial prosthesis are the main reasons for its replacement. The purpose of this study was to investigate the effect of time passage on some physical properties such as tensile strength, modulus of elasticity, elongation at break, tear strength, hardness, color stability, and contrast ratio (CR) of 2 silicone facial elastomers after being sealed in glass containers and kept in the dark for 1 year. MATERIALS AND METHODS: Specimens from 2 silicone elastomers (Silasto 30 and Premium 2) were made and stored in the dark. Tensile and tear strength tests were conducted according to International Organization for Standardization specification nos. 37 and 39, respectively, in a universal testing machine. Shore A hardness was measured according to the American Society for Testing Materials specification D 2240. Color changes (ΔΕ) were determined in the CIE Lab system using a tristimulus colorimeter, and CR also was calculated. Data were analyzed by paired and unpaired t-tests at a significance level of α = 0.05. RESULTS: Elongation at break, modulus of elasticity, and hardness were significantly changed, whereas changes in CR were observed only in 1 of the 2 elastomers. Tensile and tear strengths were not significantly changed for both of them. Within the limitations of this study, color changes (ΔΕ) were unacceptable. CONCLUSIONS: Most of the physical properties studied were significantly affected because of time passage. Mechanical and physical properties of silicone maxillofacial elastomers can be changed with time passage (natural aging in the dark). The average time of replacing a facial prostheses is 6 to 18 months; thus, it is important that the findings of this study covered a period of 12 months. Time passage seems to be a critical factor contributing to the overall deterioration of a silicone maxillofacial elastomer. Copyright © 2011 Mutaz B. Habal, MD.	en
heal.journalName	Journal of Craniofacial Surgery	en
dc.identifier.doi	10.1097/SCS.0b013e31822e5e62	en
dc.identifier.volume	22	en
dc.identifier.issue	5	en
dc.identifier.spage	1617	en
dc.identifier.epage	1621	en