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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Daronch, Márcia
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2010In vivo temperature measurementcitations
- 2008Influence of irradiant energy on degree of conversion, polymerization rate and shrinkage stress in an experimental resin composite systemcitations
- 2008Degree of conversion and mechanical properties of a BisGMAcitations
- 2007Bond strength and monomer conversion of bonding agents mixed with restorative composites prior to light exposurecitations
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article
Influence of irradiant energy on degree of conversion, polymerization rate and shrinkage stress in an experimental resin composite system
Abstract
<p>Objective: This study evaluated the degree of conversion (DC), maximum rate of cure (R<sub>p</sub><sup>max</sup>), and polymerization stress (PS) developed by an experimental dental composite subjected to different irradiant energies (3, 6, 12, 24, or 48 J/cm<sup>2</sup>) under constant irradiance (500 mW/cm<sup>2</sup>). Methods: DC and R<sub>p</sub><sup>max</sup> were monitored for 10 min on the bottom surface of 2-mm thick disks and on 150-μm thick films (representing the top of the specimen) using ATR-FTIR. PS was monitored for 10 min in 2-mm thick disks bonded to two glass rods (Ø = 5 mm) attached to a universal testing machine. One-way ANOVA/Tukey tests were used and differences in DC and R<sub>p</sub><sup>max</sup> between top and bottom surfaces were examined using Student's t-test. Statistical testing was performed at a pre-set alpha of 0.05. Results: For a given surface, DC showed differences among all groups, except at the top between 24 and 48 J/cm<sup>2</sup>. R<sub>p</sub><sup>max</sup> was similar among all groups at the same surface and statistically higher at the top surface. PS also showed significant differences among all groups. Data for 48 J/cm<sup>2</sup> were not obtained due to specimen failure at the glass/composite interface. Significance: Increases in irradiant exposure led to significant increases in DC and PS, but had no effect on R<sub>p</sub><sup>max</sup>.</p>