SAMPAIO, CAMILA S.ARIAS, JESSICA F.ATRIA, PABLO J.CACERES, EDUARDODIAZ, CAROLINA P.FREITAS, ANDERSON Z.HIRATA, RONALDO2020-03-022020-03-022019SAMPAIO, CAMILA S.; ARIAS, JESSICA F.; ATRIA, PABLO J.; CACERES, EDUARDO; DIAZ, CAROLINA P.; FREITAS, ANDERSON Z.; HIRATA, RONALDO. Volumetric polymerization shrinkage and its comparison to internal adaptation in bulk fill and conventional composites: A μCT and OCT in vitroanalysis. <b>Dental Materials</b>, v. 35, n. 11, p. 1568-1575, 2019. DOI: <a href="https://dx.doi.org/10.1016/j.dental.2019.07.025">10.1016/j.dental.2019.07.025</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/30853.0109-5641http://repositorio.ipen.br/handle/123456789/30853Objective. To quantify the volumetric polymerization shrinkage (VPS) of different conventional and bulk fill resin composites, through micro-computed tomography (μCT), and qualitative comparison of gap formation through optical coherence tomography (OCT). Methods. Box-shaped class I cavities were prepared in 30 third-molars and divided into 5 groups (n = 6): G1- Filtek Z100 (Z100); G2- Tetric Evoceram Bulk Fill (TEC); G3- Tetric EvoFlow Bulk fill (TEF); G4- Filtek Bulk fill (FBU); and G5- Filtek Bulk fill Flowable (FBF). All groups were treated with Adper Single Bond Plus adhesive and light cured (Bluephase 20i). Each tooth was scanned three times using a μCT apparatus: after cavity preparation (empty scan); after cavity filling (uncured scan) and after light curing of the restorations (cured scan). The μCT images were imported into a three-dimensional rendering software, and volumetric polymerization shrinkage percentage was calculated (%) for each sample. In the same images, interfacial gaps in the pulpal floor were qualitatively evaluated. After μCT evaluation, the pulpal floor from each tooth was polished until a thin tooth structure was obtained and OCT images were obtained by scanning the pulpal portion. Gap formation was observed and qualitatively compared to the μCT images.1568-1575openAccesspolymerizationshrinkagevolumetric analysiscomputerized tomographyoptical systemsoptical modescoherence lengthresinscomposite materialsbiological recoveryArtigo de periódico113510.1016/j.dental.2019.07.0250000-0002-5018-9126https://orcid.org/0000-0002-5018-912684.26193.33