Fatigue behavior and stress distribution of molars restored with MOD inlays with and without deep margin elevation

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dc.contributor.authorGrassi, Elisa Donaria Aboucauch [UNESP]
dc.contributor.authorde Andrade, Guilherme Schmitt [UNESP]
dc.contributor.authorTribst, João Paulo Mendes
dc.contributor.authorMachry, Renan Vaz
dc.contributor.authorValandro, Luiz Felipe
dc.contributor.authorRamos, Nathalia de Carvalho
dc.contributor.authorBresciani, Eduardo [UNESP]
dc.contributor.authorSaavedra, Guilherme de Siqueira Ferreira Anzaloni [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniversity of Taubaté (UNITAU)
dc.contributor.institutionUniversidade Federal de Sergipe (UFS)
dc.contributor.institutionSão Francisco University (USF)
dc.date.accessioned2022-05-01T09:31:21Z
dc.date.available2022-05-01T09:31:21Z
dc.date.issued2022-03-01
dc.description.abstractObjectives: This study evaluated the effect of deep margin elevation (DME) and restorative materials (leucite-reinforced glass–ceramics [C] vs. indirect resin composite [R]) on the fatigue behavior and stress distribution of maxillary molars with 2-mm deep proximal margins restored with MOD inlay. Methods: Fifty-two extracted human third molars were randomly assigned into four groups (n = 13): C; DME + C; R; and DME + R. Inlays were fabricated in CAD-CAM and bonded to all teeth. The fatigue behavior was assessed with the stepwise stress test (10,000 cycles/step; step = 50 N; 20 Hz; initial load = 200 N). Fatigue failure loads and the number of cycles were analyzed with 2-way ANOVA and Tukey’s test (p < 0.05) and Kaplan–Meier survival plots. The stress distribution was assessed with finite element analysis. The models were considered isotropic, linear, and homogeneous, and presented bonded contacts. A tripod axial load (400 N) was applied to the occlusal surface. The stress distribution was analyzed with the maximum principal stress criterion. Results: For fatigue, there was no difference for DME factor (p > 0.05). For the material factor, the load and number of cycles for failure were statistically higher in the R groups (p < 0.05). The finite element analysis showed that resin composite inlays concentrated more stress in the tooth structure, while ceramic inlays concentrated more stress in the restoration. Non-reparable failures were more frequent in the resin composite inlays groups. Conclusions: DME was not negative for fatigue and biomechanical behaviors. Resin composite inlays were more resistant to the fatigue test, although the failure mode was more aggressive. Clinical significance: DME does not impair mechanical behavior. Resin composite inlays failed at higher loads but with a more aggressive failure mode.en
dc.description.affiliationDepartment of Dental Materials and Prosthodontics Institute of Science and Technology São Paulo State University (Unesp), 777th Eng. Francisco José Longo Av., SP
dc.description.affiliationPost-Graduate Program in Dentistry University of Taubaté (UNITAU), 09th Rua Dos Operários St., SP
dc.description.affiliationGraduate Program of Oral Science Prosthodontics Unit School of Dentistry Federal University of Santa Maria (UFSM) Roraima Av, RS
dc.description.affiliationSchool of Dentistry São Francisco University (USF), 218th São Francisco de Assis Av., SP
dc.description.affiliationDepartment of Restorative Dentistry Institute of Science and Technology São Paulo State University (Unesp), 777th Eng. Francisco José Longo Av., SP
dc.description.affiliationUnespDepartment of Dental Materials and Prosthodontics Institute of Science and Technology São Paulo State University (Unesp), 777th Eng. Francisco José Longo Av., SP
dc.description.affiliationUnespDepartment of Restorative Dentistry Institute of Science and Technology São Paulo State University (Unesp), 777th Eng. Francisco José Longo Av., SP
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.format.extent2513-2526
dc.identifierhttp://dx.doi.org/10.1007/s00784-021-04219-6
dc.identifier.citationClinical Oral Investigations, v. 26, n. 3, p. 2513-2526, 2022.
dc.identifier.doi10.1007/s00784-021-04219-6
dc.identifier.issn1436-3771
dc.identifier.issn1432-6981
dc.identifier.scopus2-s2.0-85116978994
dc.identifier.urihttp://hdl.handle.net/11449/233664
dc.language.isoeng
dc.relation.ispartofClinical Oral Investigations
dc.sourceScopus
dc.subjectComposite resins
dc.subjectDental porcelain
dc.subjectDental restoration failure
dc.subjectFatigue fractures
dc.subjectFinite element analysis
dc.subjectInlays
dc.titleFatigue behavior and stress distribution of molars restored with MOD inlays with and without deep margin elevationen
dc.typeArtigo

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