Can pulpal floor debonding be detected from occlusal surface displacement in composite restorations?

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dc.creatorJoão Batista Novaes Júnior
dc.creatorElissa Talma
dc.creatorEstevam Barbosa las Casas
dc.creatorWondwosen Abebe Aregawi
dc.creatorLauren Wickham Kolstad
dc.creatorSusan Mantell
dc.creatorYan Wang
dc.creatorAlex Siu Lun Fok
dc.date.accessioned2025-07-23T18:48:48Z
dc.date.accessioned2025-09-09T00:41:52Z
dc.date.available2025-07-23T18:48:48Z
dc.date.issued2018-01
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.format.mimetypepdf
dc.identifier.doihttps://doi.org/10.1016/j.dental.2017.11.019
dc.identifier.issn1879-0097
dc.identifier.urihttps://hdl.handle.net/1843/83781
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofDental Materials
dc.rightsAcesso Restrito
dc.subjectDental debonding
dc.subjectComposite resins
dc.subjectTooth avulsion
dc.subjectDental occlusion
dc.subjectMouth floor
dc.subject.otherDental restoration
dc.subject.otherIntraoral scanner
dc.subject.otherResin composite
dc.subject.otherPolymerization shrinkage
dc.subject.otherDebonding
dc.titleCan pulpal floor debonding be detected from occlusal surface displacement in composite restorations?
dc.typeArtigo de periódico
local.citation.epage169
local.citation.issue1
local.citation.spage161
local.citation.volume34
local.description.resumoObjectives: Polymerization shrinkage of resin composite restorations can cause debonding at the tooth-restoration interface. Theory based on the mechanics of materials predicts that debonding at the pulpal floor would half the shrinkage displacement at the occlusal surface. The aim of this study is to test this theory and to examine the possibility of detecting subsurface resin composite restoration debonding by measuring the superficial shrinkage displacements. Methods: A commercial dental resin composite with linear shrinkage strain of 0.8% was used to restore 2 groups of 5 model Class-II cavities (8-mm long, 4-mm wide and 4-mm deep) in aluminum blocks (8-mm thick, 10-mm wide and 14-mm tall). Group I had the restorations bonded to all cavity surfaces, while Group II had the restorations not bonded to the cavity floor to simulate debonding. One of the proximal surfaces of each specimen was sprayed with fine carbon powder to allow surface displacement measurement by Digital Image Correlation. Images of the speckled surface were taken before and after cure for displacement calculation. The experiment was simulated using finite element analysis (FEA) for comparison. Results: Group I showed a maximum occlusal displacement of 34.7±6.7μm and a center of contraction (COC) near the pulpal floor. Group II had a COC coinciding with the geometric center and showed a maximum occlusal displacement of 17.4±3.8μm. The difference between the two groups was statistically significant (p-value=0.0007). Similar results were obtained by FEA. The theoretical shrinkage displacement was 44.6 and 22.3μm for Group I and II, respectively. The lower experimental displacements were probably caused by slumping of the resin composite before cure and deformation of the adhesive layer. Significance: The results confirmed that the occlusal shrinkage displacement of a resin composite restoration was reduced significantly by pulpal floor debonding. Recent in vitro studies seem to indicate that this reduction in shrinkage displacement could be detected by using the most accurate intraoral scanners currently available. Thus, subject to clinical validation, the occlusal displacement of a resin composite restoration may be used to assess its interfacial integrity.
local.identifier.orcidhttps://orcid.org/0000-0002-7079-936X
local.identifier.orcidhttps://orcid.org/0000-0002-9853-9746
local.identifier.orcidhttps://orcid.org/0000-0001-6078-8408
local.identifier.orcidhttps://orcid.org/0000-0002-6493-2996
local.identifier.orcidhttps://orcid.org/0000-0002-5745-9811
local.identifier.orcidhttps://orcid.org/0000-0003-2797-1467
local.publisher.countryBrasil
local.publisher.departmentENG - DEPARTAMENTO DE ENGENHARIA ESTRUTURAS
local.publisher.departmentFAO - DEPARTAMENTO DE CLÍNICA
local.publisher.initialsUFMG
local.url.externahttps://www.sciencedirect.com/science/article/pii/S0109564117303494?via%3Dihub#ack0005

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