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- Title
Delayed light‐curing of dual‐cure bulk‐fill composites on internal adaptation and depth of cure.
- Authors
Rissato, Lucas Dutra; Fraga, May Anny Alves; Gonçalves, Michelly Pires; Sinhoreti, Mario Alexandre Coelho; Correr‐Sobrinho, Lourenço; Correr, Américo Bortolazzo
- Abstract
Objective: To evaluate the effect of delayed light‐curing of dual‐cure bulk‐fill composites on internal adaptation and microhardness (KHN) in depth. Materials and Methods: Bulk‐fill composites were placed in 35 box‐shaped preparations and cured according to the following protocols (n = 5): Filtek Bulk‐Fill light‐cured immediately after insertion (FBF); Bulk‐EZ light‐cured immediately after insertion (BEZ‐I); Bulk‐EZ light‐cured 90 s after insertion (BEZ‐DP); Bulk‐EZ self‐cured (BEZ‐SC); HyperFIL light‐cured immediately after insertion (HF‐I); HyperFIL light‐cured 90 s after insertion (HF‐DP); HyperFIL self‐cured (HF‐SC). After 24 h, the samples were axially sectioned, and the internal adaptation was evaluated using replicas under a scanning electron microscope. The KHN was evaluated at six depths (0.3 mm, 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm). The statistical analysis was performed using α = 0.05. Results: The KHN significantly decreased with depth, except in self‐curing mode, when it was similar at all depths. Delayed light‐curing significantly increased the KHN at higher depths. The internal adaptation was material‐dependent. Light‐curing did not influence the internal adaptation of HyperFIL, whereas delayed light‐curing significantly reduced the internal gaps (%) of Bulk‐EZ. Conclusion: Delayed light‐curing improved the depth of cure of dual‐cure resin composites. Light‐curing did not influence the internal adaptation of HyperFIL, but delayed light‐curing improved the internal adaptation of Bulk‐EZ. Clinical Significance: Light‐curing is fundamental for improving the mechanical properties of dual‐cure resin composites. Moreover, depending on the dual‐cure resin composite, the delay in light‐curing can reduce the internal gaps.
- Subjects
DENTAL bonding; DENTAL resins; DENTAL materials; MATERIALS testing; RESEARCH funding; PROSTHODONTICS; DENTAL fillings; DENTISTRY; CEMENTUM; DENTAL cements
- Publication
Journal of Esthetic & Restorative Dentistry, 2023, Vol 35, Issue 4, p698
- ISSN
1496-4155
- Publication type
Article
- DOI
10.1111/jerd.13015