Evaluation of hardness and colour change of soft liners after accelerated ageing.

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dc.contributor.authorMancuso, Daniela Nardi
dc.contributor.authorGoiato, Marcelo Coelho [UNESP]
dc.contributor.authorZuccolotti, Bruna Carolina Rossatti
dc.contributor.authorMoreno, Amália
dc.contributor.authorSantos, Daniela Micheline dos [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:23:55Z
dc.date.available2014-05-27T11:23:55Z
dc.date.issued2009-07-01
dc.description.abstractINTRODUCTION: Soft liners have been developed to offer comfort to denture wearers. However, this comfort is compromised when there is a change in the properties of the material, causing colour change, solubility, absorption and hardening. These characteristics can compromise the longevity of soft liners. AIM: The aim of this in vitro study was to investigate the effect of ageing on both the hardness and colour change of two soft liners following accelerated ageing. METHODS: Two denture liners, one resin based (Trusoft, Bosworth, Illinois, USA) and one silicone based (Ufi Gel P, Voco GMBH, Cuxhaven, Germany), were tested in this study for both hardness (using the Shore A scale) and colour change (using the CIE L*a*b* colour scale), initially and after 1008 hours (6 weeks) of accelerated ageing. Statistical analysis was performed using the unpaired t-test with the Welch correction. RESULTS: These indicated that both materials increased in hardness and underwent colour change after accelerated ageing. The initial hardness of Trusoft was far lower than that of Ufi Gel P (18.2 Shore A units vs 34.8 Shore A units). However, for Trusoft the changes for both hardness (from 18.2 to 52.1 Shore A units) and colour change (16.85 on the CIE L*a*b* colour scale) were greater than those for Ufi Gel P, for which hardness changed from 34.8 to 36.5 Shore A units and the colour change was 5.19 on the CIE L*a*b* colour scale. CONCLUSIONS: Ufi Gel P underwent less hardness and colour change after accelerated ageing than Trusoft. On the other hand, the use of Trusoft may be preferable in cases where initial softness is a major consideration, such as when relining an immediate denture after implant surgery.en
dc.format.extent127-130
dc.identifierhttp://dx.doi.org/10.1308/135576109788634232
dc.identifier.citationPrimary dental care : journal of the Faculty of General Dental Practitioners (UK), v. 16, n. 3, p. 127-130, 2009.
dc.identifier.doi10.1308/135576109788634232
dc.identifier.issn1355-7610
dc.identifier.lattes9719883814872582
dc.identifier.orcid0000-0002-3800-3050
dc.identifier.scopus2-s2.0-70349768359
dc.identifier.urihttp://hdl.handle.net/11449/71052
dc.language.isoeng
dc.relation.ispartofPrimary dental care : journal of the Faculty of General Dental Practitioners (UK)
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectbiomedical and dental materials
dc.subjectdimeticone
dc.subjectpoly(methyl methacrylate)
dc.subjectsaliva substitute
dc.subjectsilastic
dc.subjectUfi gel
dc.subjectabsorption
dc.subjectchemistry
dc.subjectcolor
dc.subjectdenture
dc.subjectelasticity
dc.subjectevaluation
dc.subjecthardness
dc.subjecthuman
dc.subjectmaterials testing
dc.subjectsolubility
dc.subjectsurface property
dc.subjecttemperature
dc.subjecttime
dc.subjectultraviolet spectrophotometry
dc.subjectviscosity
dc.subjectAbsorption
dc.subjectColor
dc.subjectDental Materials
dc.subjectDenture Liners
dc.subjectDimethylpolysiloxanes
dc.subjectElasticity
dc.subjectHardness
dc.subjectHumans
dc.subjectMaterials Testing
dc.subjectPolymethyl Methacrylate
dc.subjectSaliva, Artificial
dc.subjectSilicone Elastomers
dc.subjectSolubility
dc.subjectSpectrophotometry, Ultraviolet
dc.subjectSurface Properties
dc.subjectTemperature
dc.subjectTime Factors
dc.subjectViscosity
dc.titleEvaluation of hardness and colour change of soft liners after accelerated ageing.en
dc.typeArtigo
dcterms.licensehttp://www.ingentaconnect.com/about/terms
unesp.author.lattes9719883814872582
unesp.author.orcid0000-0002-3800-3050[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Odontologia, Araçatubapt

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