Effects of outdoor weathering on facial prosthetic elastomers

Eleni, PN; Krokida, M; Polyzois, G; Gettleman, L; Bisharat, GI

dc.contributor.author	Eleni, PN	en
dc.contributor.author	Krokida, M	en
dc.contributor.author	Polyzois, G	en
dc.contributor.author	Gettleman, L	en
dc.contributor.author	Bisharat, GI	en
dc.date.accessioned	2014-03-01T01:35:36Z
dc.date.available	2014-03-01T01:35:36Z
dc.date.issued	2011	en
dc.identifier.issn	1618-1247	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21120
dc.subject	Chlorinated polyethylene	en
dc.subject	Mechanical properties	en
dc.subject	Natural weathering	en
dc.subject	Polydimethyl siloxane	en
dc.subject	Thermal analysis	en
dc.subject.classification	Dentistry, Oral Surgery & Medicine	en
dc.subject.other	dimeticone	en
dc.subject.other	elastomer	en
dc.subject.other	polyethylene derivative	en
dc.subject.other	article	en
dc.subject.other	compressive strength	en
dc.subject.other	dental care	en
dc.subject.other	differential scanning calorimetry	en
dc.subject.other	elasticity	en
dc.subject.other	hardness	en
dc.subject.other	heat	en
dc.subject.other	instrumentation	en
dc.subject.other	materials testing	en
dc.subject.other	maxillofacial prosthesis	en
dc.subject.other	radiation exposure	en
dc.subject.other	sunlight	en
dc.subject.other	tensile strength	en
dc.subject.other	theoretical model	en
dc.subject.other	transition temperature	en
dc.subject.other	viscosity	en
dc.subject.other	weather	en
dc.subject.other	Calorimetry, Differential Scanning	en
dc.subject.other	Compressive Strength	en
dc.subject.other	Dental Stress Analysis	en
dc.subject.other	Dimethylpolysiloxanes	en
dc.subject.other	Elasticity	en
dc.subject.other	Elastomers	en
dc.subject.other	Hardness	en
dc.subject.other	Hot Temperature	en
dc.subject.other	Materials Testing	en
dc.subject.other	Maxillofacial Prosthesis	en
dc.subject.other	Models, Theoretical	en
dc.subject.other	Polyethylenes	en
dc.subject.other	Sunlight	en
dc.subject.other	Tensile Strength	en
dc.subject.other	Transition Temperature	en
dc.subject.other	Viscosity	en
dc.subject.other	Weather	en
dc.title	Effects of outdoor weathering on facial prosthetic elastomers	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/s10266-010-0145-0	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s10266-010-0145-0	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	Physical weathering is usually responsible for the degradation of maxillofacial prosthetic elastomers and the replacement of prostheses. The purpose of this study was to investigate the effects of outdoor weathering on the physical properties of four nonpigmented facial prosthetics after 1 year of exposure. In addition, simple mathematical models were developed to correlate the measured properties with irradiation time, including parameters with physical meaning. Three different medical-grade polydimethyl siloxanes (PDMSs) and an experimental chlorinated polyethylene (CPE) were examined in this study. The samples were exposed to solar radiation for 1 year in Athens, Greece. Mechanical tests (compression and tensile) were performed using universal-type testing machine, and hardness measurements were performed with a durometer (Shore A). Thermal tests were also performed with a differential scanning calorimeter. Simple mathematical models were developed to describe the examined properties. Changes observed in the properties of examined materials, before and after the exposure, reflected the effect of weathering. More specifically, two of the silicone prosthetics (Elastomer 42, TechSIL 25) seemed to become harder and more brittle, different from the other silicone (M511) sample and the CPE sample, which became softer and more ductile. Moreover mathematical models correlate the measured properties with irradiation time, and their constants indicate that duration of exposure seems to increase the degradation. Significant changes in the mechanical and thermal properties of the examined materials were observed as a result of outdoor weathering. The effect of weathering on samples' properties was introduced through its effect on the mathematical models' parameters. © 2011 The Society of The Nippon Dental University.	en
heal.publisher	SPRINGER	en
heal.journalName	Odontology	en
dc.identifier.doi	10.1007/s10266-010-0145-0	en
dc.identifier.isi	ISI:000286629900011	en
dc.identifier.volume	99	en
dc.identifier.issue	1	en
dc.identifier.spage	68	en
dc.identifier.epage	76	en