Effect of Light-Curing Exposure Time, Shade, and Thickness on the Depth of Cure of Bulk Fill Composites
| Autor: | Daniela Garcia, Alexandra Rodriguez, Peter Yaman, Joseph B. Dennison |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Dental Stress Analysis
Curing Lights Dental Materials science Time Factors Composite number Bulk fill 030206 dentistry 02 engineering and technology 021001 nanoscience & nanotechnology Composite Resins Light curing 03 medical and health sciences 0302 clinical medicine Hardness Humans Composite material 0210 nano-technology General Dentistry Light-Curing of Dental Adhesives |
| Zdroj: | Operative dentistry. 42(5) |
| ISSN: | 1559-2863 |
| Popis: | SUMMARY Purpose: To investigate the effect of different light exposure times, shades, and thicknesses on the depth of cure (DOC) of bulk fill composites. Methods and Materials: Two bulk fill composites, Tetric EvoCeram Bulk Fill (TBF) and Sonic Fill (SF), and a conventional composite, Filtek Supreme Ultra (FSU), were evaluated. Samples (n=10) were made using two different shades (light and dark), thicknesses (2 and 4 mm) and exposure times (20 and 40 seconds). A Tukon 2100B-testing machine was used to obtain three Knoop hardness numbers (KHNs) measured at the top and bottom of each sample, and DOC was calculated as the bottom/top ratio. Statistical analysis was done using a Student t-test for comparisons between groups with a Bonferroni correction of p < 0.004. Results: Top hardness values ranged from 79.79 to 85.07 for FSU, 69.49 to 91.65 for SF, and 51.01 to 57.82 for TBF. Bottom KHNs ranged from 23.54 to 73.25 for FSU, 45.74 to 77.12 for SF, and 36.95 to 52.51 for TBF. TBF had the lowest overall KHNs. Light-curing exposure time, shade, and material thickness influenced the DOC in most groups, especially at 4-mm depths. A higher bottom/top ratio was achieved when a 40-second cure was compared to a 20-second cure, when light shades were compared to dark shades, and when 2-mm increments were compared to 4-mm increments. |
| Databáze: | OpenAIRE |
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