Stress distribution on different bar materials in implant-retained palatal obturator

dc.contributor.authorVillefort, Regina Furbino
dc.contributor.authorMendes Tribst, João Paulo [UNESP]
dc.contributor.authorDal Piva, Amanda Maria de Oliveira [UNESP]
dc.contributor.authorBorges, Alexandre Luiz [UNESP]
dc.contributor.authorBinda, Nívia Castro
dc.contributor.authorFerreira, Carlos Eduardo de Almeida
dc.contributor.authorBottino, Marco Antonio [UNESP]
dc.contributor.authorvon Zeidler, Sandra Lúcia Ventorim
dc.contributor.institutionRede Nordeste de Biotecnologia (RENORBIO)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2021-06-25T10:40:28Z
dc.date.available2021-06-25T10:40:28Z
dc.date.issued2020-10-01
dc.description.abstractImplant-retained custom-milled framework enhances the stability of palatal obturator prostheses. Therefore, to evaluate the mechanical response of implant-retained obturator prostheses with bar-clip attachment and milled bars, in three different materials under two load incidences were simulated. A maxilla model which Type IIb maxillary defect received five external hexagon implants (4.1 x 10 mm). An implant-supported palatal obturator prosthesis was simulated in three different materials: polyetheretherketone (PEEK), titanium (Ti:90%, Al:6%, V:4%) and Co-Cr (Co:60.6%, Cr:31.5%, Mo:6%) alloys. The model was imported into the analysis software and divided into a mesh composed of nodes and tetrahedral elements. Each material was assumed isotropic, elastic and homogeneous and all contacts were considered ideal. The bone was fixed and the load was applied in two different regions for each material: at the palatal face (cingulum area) of the central incisors (100 N magnitude at 45°); and at the occlusal surface of the first left molar (150 N magnitude normal to the surface). The microstrain and von-Mises stress were selected as criteria for analysis. The posterior load showed a higher strain concentration in the posterior peri-implant tissue, near the load application side for cortical and cancellous bone, regardless the simulated material. The anterior load showed a lower strain concentration with reduced magnitude and more implants involving in the load dissipation. The stress peak was calculated during posterior loading, which 77.7 MPa in the prosthetic screws and 2,686 με microstrain in the cortical bone. For bone tissue and bar, the material stiffness was inversely proportional to the calculated microstrain and stress. However, for the prosthetic screws and implants the PEEK showed higher stress concentration than the other materials. PEEK showed a promising behavior for the bone tissue and for the integrity of the bar and bar-clip attachments. However, the stress concentration in the prosthetic screws may represent an increase in failure risk. The use of Co-Cr alloy can reduce the stress in the prosthetic screw; however, it increases the bone strain; while the Titanium showed an intermediate behavior.en
dc.description.affiliationBiotechnology Program Federal University of Espírito Santo Rede Nordeste de Biotecnologia (RENORBIO)
dc.description.affiliationPost-Graduate Program in Restorative Dentistry (Prosthodontic) Department of Dental Materials and Prosthodontics Institute of Science and Technology São Paulo State University (Unesp/SJC)
dc.description.affiliationUnespPost-Graduate Program in Restorative Dentistry (Prosthodontic) Department of Dental Materials and Prosthodontics Institute of Science and Technology São Paulo State University (Unesp/SJC)
dc.identifierhttp://dx.doi.org/10.1371/journal.pone.0241589
dc.identifier.citationPLoS ONE, v. 15, n. 10 October, 2020.
dc.identifier.doi10.1371/journal.pone.0241589
dc.identifier.issn1932-6203
dc.identifier.scopus2-s2.0-85094983956
dc.identifier.urihttp://hdl.handle.net/11449/206786
dc.language.isoeng
dc.relation.ispartofPLoS ONE
dc.sourceScopus
dc.titleStress distribution on different bar materials in implant-retained palatal obturatoren
dc.typeArtigo

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