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Research Article
- Effect of high irradiance and short exposure curing time on the fracture toughness of bulk-fill resin-based composite: an in vitro study
- Beatriz Ometto Sahadi, Tainah Oliveira Rifane, Carolina Bosso André, Vitaliano Gomes Araújo-Neto, Richard Thomas Bengt Price, Marcelo Giannini
- J Korean Acad Conserv Dent ;Published online April 20, 2026
- DOI: https://doi.org/10.5395/rde.2026.51.e23 [Epub ahead of print]
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Abstract
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ePub - Objectives
This study aimed to determine the effect of high irradiance and short exposure time on the fracture toughness of bulk-fill resin-based composites (RBCs).
Methods
Three RBCs were tested: Tetric PowerFill (TPF; Ivoclar Vivadent), Opus Bulk Fill APS (OBF; FGM Dental Group), and Filtek One Bulk Fill (FOB; Solventum). Sixty single-edge-notched disc specimens were prepared using a fracture toughness mold. Each group consisted of 20 samples, divided into two subgroups (n = 10). The RBCs were lightcured either for 3 seconds in high-irradiance mode (‘3s cure’) or for the manufacturer-recommended times (TPF, 10 seconds; OBF, 30 seconds; FOB, 20 seconds) in ‘high power’ mode using the Bluephase PowerCure (Ivoclar Vivadent). The peak spectral wavelength was measured using a spectrophotometer. Specimens were tested on a universal testing machine, and data were analyzed by two-way analysis of variance and Bonferroni test (α = 0.05).
Results
Radiant exposure values (J/cm²) were 9.5 for the 3-second mode and 12.4, 24.8, and 37.1 for 10, 20, and 30 seconds (high power mode), respectively. FOB (4.22 and 3.79 MPa∙m0.5 for 20 and 3 seconds) had the highest mean fracture toughness, while OBF showed the lowest (2.01 and 2.10 MPa∙m0.5 for 30 and 3 seconds). TPF produced intermediate results (2.72 and 2.70 MPa∙m0.5 for 10 and 3 seconds). Exposure time did not affect TPF and OBF, while the 3-second exposure significantly reduced the fracture toughness for FOB.
Conclusions
The RBCs tested had different fracture toughness values regardless of exposure time. High irradiance and short exposure can reduce fracture toughness depending on the RBC tested.
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