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| Author(s): |
Beatriz Curvello de Mendonça
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Piracicaba, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Odontologia de Piracicaba |
| Defense date: | 2019-02-21 |
| Examining board members: |
Marcelo Giannini;
Carlos Eduardo Francci;
Flavio Henrique Baggio Aguiar
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| Advisor: | Marcelo Giannini |
| Abstract | |
The aims of this study was to evaluate Flexural Strength (BFS), Knoop Microhardness (KHN), Polymerization Shrinkage Stress (PSS), Internal Adaptation and Gap Formation (IAG) and Dentin Bond Strengt (DBS) of one conventional and five resin-based bulk-fill materials. Six composites were tested: a conventional (incremental placement) composite resin (Filtek Supreme Ultra) and five resin-based bulk-fill materials: two packable composites (Tetric EvoCeram Bulk Fill and Opus Bulk Fill), one low viscosity dual-cure composite (Fill-Up!), one bioactive material (Activa BioActive Restorative) and one resin-glass ionomer hybrid material (Equia Forte Fill). For BFS, discs (0.5 mm thick) were fabricated using a set of eight molds, to simulate polymerization depth of 4 mm. For KHN and IAG, a standardized Class I preparation was made in extracted molars and the cavities were filled with the materials. After storage, restorations were cross- sectioned and one half KHN was mesasured at four depths and the other half was analyzed in scanning electron microscopy (SEM). PSS was determined using composite bonded to acrylic rods attached to a universal testing machine (n = 5). For the DBS test, standardized class I cavities were preparated and filled with the restorative material and its respective bonding agent (n = 10) and cut into sticks-shaped specimens to be tested. Data were statistically analyzed by two- (BFS, KHN and DBS) and one-way (PSS and IAG) ANOVA and Tukey post-hoc test (alpha of 0.05). BFS only for Activa BioActive Restorative and Opus Bulk Fill reduced following the increase depth. Equia Forte Fill presented the lowest BFS, regardless the depth. Filtek Supreme Ultra showed the highest BFS value at the bottom (4mm). Depth affected the KHN for Tetric EvoCeram Bulk Fill and Fill-Up!. Filtek Supreme Ultra and Equia Forte Fill showed no statistical differences for all depths. Activa BioActive Restorative presented the lowest KHN values among materials, regardless depth. For PSS, Equia Forte Fil showed the lowest values and Fill-Up! showed higher values but not statistically different from Filtek Supreme Ultra and Opus Bulk-Fill. IGA was lower for Tetric EvoCeram Bulk-fill, Opus Bulk-fill and Activa BioActive Restorative. DBS significantly decreased after 1-year storage for Filtek Supreme Ultra, Opus Bulk Fill and Fill-Up! Depth can affect BFS and KHN of bulk-fill restorative materials, but the results depend on the type of bulk-fill compositie tested. IAG, PSS and DBS results varied among bulk fill materials and were also composition- and material-dependent. The regular composite did not show higher physycal properties than the bulk-fill materials (AU) | |
| FAPESP's process: | 17/04348-2 - Evaluation of physical and mechanical properties of bulk-fill restorative materials |
| Grantee: | Beatriz Curvello de Mendonça |
| Support Opportunities: | Scholarships in Brazil - Master |