Impact of light-curing distance on the effectiveness of cure of bulk-fill resin-based composites
Objective: To investigate the effect of light-curing distance on the effectiveness of cure (EC) of bulk-fill resin-based composites (RBCs). Materials and methods: Two bulk-fill RBCs (a Tetric N-Ceram Bulk Fill (TN) and a Filtek Bulk Fill (FK)) are evaluated. Specimens (4 mm high) are cured for 20 s...
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| Language: | English |
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Springer
2021-12-01
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| Series: | Saudi Dental Journal |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1013905221000031 |
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| author | Rana Abdelbaset Diab Adrian Ujin Yap Maria Angela Garcia Gonzalez Noor Azlin Yahya |
| author_facet | Rana Abdelbaset Diab Adrian Ujin Yap Maria Angela Garcia Gonzalez Noor Azlin Yahya |
| author_sort | Rana Abdelbaset Diab |
| collection | DOAJ |
| description | Objective: To investigate the effect of light-curing distance on the effectiveness of cure (EC) of bulk-fill resin-based composites (RBCs). Materials and methods: Two bulk-fill RBCs (a Tetric N-Ceram Bulk Fill (TN) and a Filtek Bulk Fill (FK)) are evaluated. Specimens (4 mm high) are cured for 20 s at different distances (0 mm (D0), 2 mm (D2), 4 mm (D4), 6 mm (D6) and 8 mm (D8)) and stored for 24 h in 100% relative humidity at 37 °C. The top and bottom surface hardness (SH) (n = 12) are assessed using a Knoop microhardness tester and the EC is calculated. The EC is characterized by the hardness ratio (HR) (mean bottom: top SH). An HR of 0.8 is used as the benchmark for an effective/adequate cure. Data are analyzed using one-way analysis of variance and Tukey’s post hoc test (α = 0.05). Correlations between the top and bottom surfaces are examined using the Pearson correlation (α = 0.05). Results: For the TN, the HR at D8 is significantly lower than all other light-curing distances, while for the FK, it is significantly lower than D0 only. Conclusion: The effect of light-curing distance on the EC of bulk-fill RBCs is material dependent. Notwithstanding the light-curing distance, the EC of the FK and TN is below the threshold HR value of 0.8 when photopolymerized for 20 s in 4 mm increments in black opaque molds. |
| format | Article |
| id | doaj-art-fa3e8e94243a4ad88a2e002da2a9a8c7 |
| institution | OA Journals |
| issn | 1013-9052 |
| language | English |
| publishDate | 2021-12-01 |
| publisher | Springer |
| record_format | Article |
| series | Saudi Dental Journal |
| spelling | doaj-art-fa3e8e94243a4ad88a2e002da2a9a8c72025-08-20T01:48:41ZengSpringerSaudi Dental Journal1013-90522021-12-013381184118910.1016/j.sdentj.2021.01.003Impact of light-curing distance on the effectiveness of cure of bulk-fill resin-based compositesRana Abdelbaset Diab0Adrian Ujin Yap1Maria Angela Garcia Gonzalez2Noor Azlin Yahya3Department of Restorative Dentistry, Faculty of Dentistry, University of Malaya, Kuala Lumpur, MalaysiaDepartment of Restorative Dentistry, Faculty of Dentistry, University of Malaya, Kuala Lumpur, Malaysia; Department of Dentistry, Ng Teng Fong General Hospital and Faculty of Dentistry National University of Singapore, National University Health System, Singapore; National Dental Research Institute Singapore, National Dental Centre Singapore and Duke-NUS Medical School, Singapore Health Services, SingaporeDepartment of Restorative Dentistry, Faculty of Dentistry, University of Malaya, Kuala Lumpur, MalaysiaDepartment of Restorative Dentistry, Faculty of Dentistry, University of Malaya, Kuala Lumpur, Malaysia; Corresponding author at: University of Malaya, 50603 Kuala Lumpur, Malaysia.Objective: To investigate the effect of light-curing distance on the effectiveness of cure (EC) of bulk-fill resin-based composites (RBCs). Materials and methods: Two bulk-fill RBCs (a Tetric N-Ceram Bulk Fill (TN) and a Filtek Bulk Fill (FK)) are evaluated. Specimens (4 mm high) are cured for 20 s at different distances (0 mm (D0), 2 mm (D2), 4 mm (D4), 6 mm (D6) and 8 mm (D8)) and stored for 24 h in 100% relative humidity at 37 °C. The top and bottom surface hardness (SH) (n = 12) are assessed using a Knoop microhardness tester and the EC is calculated. The EC is characterized by the hardness ratio (HR) (mean bottom: top SH). An HR of 0.8 is used as the benchmark for an effective/adequate cure. Data are analyzed using one-way analysis of variance and Tukey’s post hoc test (α = 0.05). Correlations between the top and bottom surfaces are examined using the Pearson correlation (α = 0.05). Results: For the TN, the HR at D8 is significantly lower than all other light-curing distances, while for the FK, it is significantly lower than D0 only. Conclusion: The effect of light-curing distance on the EC of bulk-fill RBCs is material dependent. Notwithstanding the light-curing distance, the EC of the FK and TN is below the threshold HR value of 0.8 when photopolymerized for 20 s in 4 mm increments in black opaque molds.http://www.sciencedirect.com/science/article/pii/S1013905221000031Composite resinsCuring lightHardness |
| spellingShingle | Rana Abdelbaset Diab Adrian Ujin Yap Maria Angela Garcia Gonzalez Noor Azlin Yahya Impact of light-curing distance on the effectiveness of cure of bulk-fill resin-based composites Saudi Dental Journal Composite resins Curing light Hardness |
| title | Impact of light-curing distance on the effectiveness of cure of bulk-fill resin-based composites |
| title_full | Impact of light-curing distance on the effectiveness of cure of bulk-fill resin-based composites |
| title_fullStr | Impact of light-curing distance on the effectiveness of cure of bulk-fill resin-based composites |
| title_full_unstemmed | Impact of light-curing distance on the effectiveness of cure of bulk-fill resin-based composites |
| title_short | Impact of light-curing distance on the effectiveness of cure of bulk-fill resin-based composites |
| title_sort | impact of light curing distance on the effectiveness of cure of bulk fill resin based composites |
| topic | Composite resins Curing light Hardness |
| url | http://www.sciencedirect.com/science/article/pii/S1013905221000031 |
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