Impact of light-curing distance on the effectiveness of cure of bulk-fill resin-based composites

Diab, Rana Abdelbaset and Yap, Adrian Ujin and Gonzalez, Maria Angela Garcia and Yahya, N.A. (2021) Impact of light-curing distance on the effectiveness of cure of bulk-fill resin-based composites. Saudi Dental Journal, 33 (8). pp. 1184-1189. ISSN 1013-9052, DOI https://doi.org/10.1016/j.sdentj.2021.01.003.

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Abstract

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. © 2021 King Saud University

Item Type: Article
Funders: Faculty of Dentistry, University of Malaya[DPRG/08/17], Faculty of Dentistry, University of Malaya[GPF011E-2018]
Uncontrolled Keywords: Composite resins;Curing light;Hardness
Subjects: R Medicine
R Medicine > RK Dentistry
R Medicine > RK Dentistry > Oral surgery
Divisions: Faculty of Dentistry
Depositing User: Ms Zaharah Ramly
Date Deposited: 19 Oct 2022 06:13
Last Modified: 19 Oct 2022 06:13
URI: http://eprints.um.edu.my/id/eprint/35630

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