0119 The Effect of Temperature on Hardness of a Light-curing Composite |
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T. BORTOLOTTO, and I. KREJCI, University of Geneva, Switzerland Objective: To compare the hardness of a 0.5 mm thick light-curing luting composite, inserted at three different temperatures and lightcured directly or through ceramic using halogen (Astralis 10 with turbo, Ivoclar-Vivadent) and LED (LumeCure 2, Ultradent). Methods: A round cavity 0.5 mm deep and 10.0 mm in diameter was prepared in the center of a flattened extracted human tooth surface and filled with Tetric Transparent (Ivoclar-Vivadent), applied in the sense of a luting composite, and lightcured through a 4 mm thick ceramic block (Vitablocks Mark II, 3M2, Vita) for groups 1 to 8, or cured directly in the control groups (9 to 11). After 7 days storage at 37°C in the dark at 100% humidity, 20 Vicker's hardness measurements at the bottom of the specimens were performed per group. Data were analyzed by ANOVA and Scheffée with significance level at p<0.05. Results: Test Groups Vicker's (Mean ± SD) 1: 05 °C, 60 s Astralis 10 54.9 ± 2,6 2: 22 °C, 60 s Astralis 10 80.9 ± 2,6 3: 40 °C, 60 s Astralis 10 96.6 ± 2,1 4: 40 °C, 30 s Astralis 10 87.7 ± 1,7 5: 05 °C, 60 s UltraLume 2 41.8 ± 1,5 6: 22 °C, 60 s UltraLume 2 56.0 ± 1,9 7: 40 °C, 60 s UltraLume 2 86.1 ± 5,4 8: 40 °C, 30 s UltraLume 2 49.0 ± 1,2 Controls 9: 05 °C, 60 s Astralis 10 87.9 ± 2,5 10: 22 °C, 60 s Astralis 10 95.9 ± 3,2 11: 40 °C, 60 s Astralis 10 108.1 ± 2,4 Conclusions: Among other parameters, temperature has an important influence on the hardness of a composite. |
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Seq #25 - Cements: Properties, Composition, and Marginal Adaptation |
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Back to the Dental Materials: III - Ceramics and Cements Program |
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