Light Transmittance and Polymerization of Bulk-Fill Composite Materials Doped with Bioactive Micro-Fillers
| Autor: | Thomas Attin, Phoebe Dieckmann, Tobias T. Tauböck, Matthias Zehnder, Dirk Mohn |
|---|---|
| Přispěvatelé: | University of Zurich, Tauböck, Tobias T |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
bulk-fill 610 Medicine & health Indentation hardness Article bioactive filler bioglass resin composite monomer conversion micro-hardness law.invention 03 medical and health sciences 0302 clinical medicine law 10066 Clinic of Conservative and Preventive Dentistry 0502 economics and business Transmittance General Materials Science Composite material Inert 05 social sciences Doping 030206 dentistry 2500 General Materials Science Portland cement Polymerization Bioactive glass Knoop hardness test 050211 marketing |
| Zdroj: | Materials, 12 (24) Materials Volume 12 Issue 24 |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma12244087 |
| Popis: | This study investigated the effect of bioactive micro-fillers on the light transmittance and polymerization of three commercially available bulk-fill resin composites. These were mixed with 20 wt% bioactive glass 45S5, Portland cement, inert dental barium glass, or nothing (controls). Composites were photo-activated and light transmittance through 4 mm thick specimens was measured in real time. Moreover, degree of conversion (DC) and Knoop hardness (KHN) were assessed. Light transmittance of all bulk-fill composites significantly decreased (p < 0.05) with addition of 20 wt% bioactive glass 45S5 but not when inert barium glass was added. For bulk-fill composites modified with Portland cement, light irradiance dropped below the detection limit at 4 mm depth. The DC at the top surface of the specimens was not affected by addition of bioactive or inert micro-fillers. The bottom-to-top ratio of both DC and KHN surpassed 80% for bulk-fill composites modified with 20 wt% bioactive or inert glass fillers but fell below 20% when the composites were modified with Portland cement. In contrast to Portland cement, the addition of 20 wt% bioactive glass maintains adequate polymerization of bulk-fill composites placed at 4 mm thickness, despite a decrease in light transmittance compared to the unmodified materials. Materials, 12 (24) ISSN:1996-1944 |
| Databáze: | OpenAIRE |
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