ArticleBrazilian dental journal2025
Composite monomer conversion and microhardness using short curing times.
Article in Brazilian dental journal, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
2 citing papers in PubMed.
- Bonding Performance of Etch-and-Rinse and Universal Adhesives for Metal Bracket Fixation: An In Vitro Mechanical and SEM Study.Biomedicines · 2026Article
- Optimizing Dental Resin-Based Composite Polymerization with Distance and Exposure Variables: Preliminary Study.Materials (Basel, Switzerland) · 2026Article
Corrections and comments
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Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
This study evaluated how short curing times affect monomer conversion and microhardness of a bulk-fill composite. Two light-curing units (LCUs) were used: a laser LCU (Monet, AMD Lasers) and a multi-peak LED LCU (PowerCure, Ivoclar Vivadent). A bulk-fill composite (Tetric PowerFill, Ivoclar) was cured for 1, 2, or 3 seconds with the laser, and for 3 or 20 seconds with the LED. Monomer conversion was measured via real-time FTIR at the bottom of 4-mm composite cylinders. Microhardness was assessed at 100µm, 1mm, 2mm, 3mm, and 390µm depths. Spectral irradiance, radiant emittance, and radiant exposure of each LCU were recorded using a calibrated system. Data were analyzed using ANOVA and Tukey's test (α = 0.05). Radiant exposures for the laser LCU were 2.5, 5.0, and 7.5 J/cm² for 1, 2, and 3 seconds, respectively. The LED LCU delivered 9.3 J/cm² (3 s) and 22.3 J/cm² (20 s). Monomer conversion at 4 mm increased with more prolonged exposure for both LCUs. The LED LCU at 20 seconds showed significantly higher conversion than at 3 seconds. Microhardness decreased with depth, regardless of curing method or duration. Monomer conversion at 4 mm was higher with increased curing time, correlating with radiant exposure. Only the 20-second LED exposure provided a bottom-to-top microhardness ratio of 0.84, indicating sufficient curing at depth.
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Registered trials
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