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dc.contributor.CRUESPUNIVERSIDADE ESTADUAL DE CAMPINASpt_BR
dc.contributor.authorunicampBacchi, Ataís-
dc.contributor.authorunicampConsani, Rafael Leonardo Xediek-
dc.typeArtigopt_BR
dc.titleThio-urethane oligomers improve the properties of light-cured resin cementspt_BR
dc.contributor.authorBacchi, Atais-
dc.contributor.authorConsani, Rafael L.-
dc.contributor.authorMartim, Gedalias C.-
dc.contributor.authorPfeifer, Carmem S.-
dc.subjectCimentos de resinapt_BR
dc.subject.otherlanguageResin cementspt_BR
dc.description.abstractThio-urethanes were synthesized by combining 1,6-hexanediol-diissocyante (aliphatic) with pentaerythritol tetra-3-mercaptopropionate (PETMP) or 1,3-bis(1-isocyanato-1-methylethyl)benzene (aromatic) with trimethylol-tris-3-mercaptopropionate (TMP), at 1:2 isocyanate:thiol, leaving pendant thiols. Oligomers were added at 10-30 phr to BisGMA-UDMA-TEGDMA (5:3:2, BUT). 25 wt% silanated inorganic fillers were added. Commercial cement (Relyx Veneer, 3M-ESPE) was also evaluated with 10-20 phr of aromatic oligomer. Near-IR was used to follow methacrylate conversion (DC) and rate of polymerization (Rp(max)). Mechanical properties were evaluated in three-point bending (ISO 4049) for flexural strength/modulus (FS/FM, and toughness), and notched specimens (ASTM Standard E399-90) for fracture toughness (KO. Polymerization stress (PS) was measured on the Bioman. Volumetric shrinkage (VS, %) was measured with the bonded disk technique. Results were analyzed with ANOVA/Tukey's test (alpha = 5%). In general terms, for BUT cements, conversion and mechanical properties in flexure increased for selected groups with the addition of thio-urethane oligomers. The aromatic versions resulted in greater FS/FM than aliphatic. Fracture toughness increased by twofold in the experimental groups (from 1.17 +/- 0.36 MPa m(1/2) to around 3.23 +/- 0.22 MPa m(1/2)). Rp(max) decreased with the addition of thio-urethanes, though the vitrification point was not statistically different from the control. VS and PS decreased with both oligomers. For the commercial cement, 20 phr of oligomer increased DC, vitrification, reduced Rpmax and also significantly increased K-IC, and reduced PS and FM. Thio-urethane oligomers were shown to favorably modify conventional dimethacrylate networks. Significant reductions in polymerization stress were achieved at the same time conversion and fracture toughness increasedpt_BR
dc.relation.ispartofDental materialspt_BR
dc.relation.ispartofabbreviationDental mater.pt_BR
dc.publisher.cityKidlintonpt_BR
dc.publisher.countryReino Unidopt_BR
dc.publisherElsevierpt_BR
dc.date.issued2015-
dc.date.monthofcirculationMaypt_BR
dc.language.isoengpt_BR
dc.description.volume31pt_BR
dc.description.issuenumber5pt_BR
dc.description.firstpage565pt_BR
dc.description.lastpage574pt_BR
dc.rightsFechadopt_BR
dc.sourceWOSpt_BR
dc.identifier.issn0109-5641pt_BR
dc.identifier.eissn1879-0097pt_BR
dc.identifier.doi10.1016/j.dental.2015.02.008pt_BR
dc.identifier.urlhttps://www.sciencedirect.com/science/article/pii/S0109564115000573pt_BR
dc.description.sponsorshipCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESpt_BR
dc.description.sponsordocumentnumberBEX 5627-13-3pt_BR
dc.date.available2021-02-09T10:25:32Z-
dc.date.accessioned2021-02-09T10:25:32Z-
dc.description.provenanceSubmitted by Sanches Olivia (olivias@unicamp.br) on 2021-02-09T10:25:32Z No. of bitstreams: 0. Added 1 bitstream(s) on 2021-05-25T12:09:17Z : No. of bitstreams: 1 000353068700011.pdf: 962784 bytes, checksum: 4a27e62c457fea70739aec4c1d8ed3ae (MD5)en
dc.description.provenanceMade available in DSpace on 2021-02-09T10:25:32Z (GMT). No. of bitstreams: 0 Previous issue date: 2015en
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/355384-
dc.contributor.departmentsem informaçãopt_BR
dc.contributor.departmentDepartamento de Prótese e Periodontiapt_BR
dc.contributor.unidadeFaculdade de Odontologia de Piracicabapt_BR
dc.subject.keywordThio-urethane oligomerspt_BR
dc.subject.keywordPolymerization stresspt_BR
dc.subject.keywordMechanical resistancept_BR
dc.identifier.source000353068700011pt_BR
dc.creator.orcid0000-0002-9913-8290pt_BR
dc.creator.orcid0000-0003-4122-9234pt_BR
dc.type.formArtigopt_BR
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