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INTRODUCTION: Composite restorations are constantly exposed to water which negatively affects their longevity. In this study, the long- term water sorption and solubility of new generations of bulk-fill composites were examined during three months. MATERIALS AND METHODS: Seven composite materials were tested, of which five bulk-fill ma-terials (Tetric PowerFill, Ivoclar Vivadent ; Filtek One Bulk Fill Restorative, 3M ; Fill-Up !, Coltene / Whaledent AG ; Tetric PowerFlow, Ivoclar Vivadent ; SDR Plus Bulk Fill Flowable, Dentsply Caulk) and two conventional composites (Tetric EvoCeram and Tetric EvoFlow, Ivoclar Vivadent). Compo-site specimens with a diameter of 6 mm and a height of 2 mm (n = 6) were polymerized using a LED curing unit (Bluephase® PowerCure, Ivoclar Vivadent, 950 mW/cm2) for 20 s on each side. Water sorption and solubility were measured by the modified ISO 4049 method after 1, 7 and 90 days of immersion. RESULTS: Fill-Up! had the highest water sorption, followed by Filtek One Bulk Fill Restorative and Tetric EvoFlow which have statistically similar results with values above 20 μg / mm3. Tetric PowerFlow showed the lowest values of water absorption. Negative solubility values were obtained with Tetric EvoFlow, Tetric EvoCeram and Tetric PowerFill, and for Tetric PowerFlow the solubility value was almost equal to zero. CONCLUSION: After 90 days of immersion in water, composites with a lower inorganic filler con-tent generally showed higher absorption values, with the exception of Filtek One material which had the highest proportion of agglomerated fillers that hydrolyzed more easily. Tetric PowerFlow was the most stable material in this study. This research was funded by the Croatian Science Foundation, project IP-2019-04- 6183. |
