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- Title
Flexural strength and microhardness of bulk‐fill restorative materials.
- Authors
Mendonça, Beatriz Curvello; Soto‐Montero, Jorge Rodrigo; Castro, Eduardo Fernandes; Pecorari, Vanessa Gallego Arias; Rueggeberg, Frederick Allen; Giannini, Marcelo
- Abstract
Background: Bulk‐fill materials can facilitate the restorative procedure mainly for deep and wide posterior cavities. The purpose of this study was to evaluate flexural strength (biaxial flexural strength [BFS]) and microhardness (Knoop microhardness [KHN]) at different depths of bulk‐fill materials. Methods: Five bulk‐fill materials were tested: two light‐curable composite resins, one dual‐cure composite, one bioactive restorative, and a high‐viscosity glass ionomer. A conventional composite was used as control. BFS and KHN were tested at different depths. Data was analyzed by two‐ and one‐way ANOVAs, respectively and Tukey's post‐hoc (α=0.05). Results: The high‐viscosity glass ionomer material presented the lowest BFS at all depths. KHN for the two light‐curable and the dual‐cure bulk‐fill resin composites was reduced following an increase in restoration depth, while the conventional composite, the bioactive material, and the high‐viscosity glass ionomer were not affected. Conclusion: There are differences in the properties of the tested materials at 4 mm depth, showing that the studied properties of some materials vary according to the cavity depth, although the results are material dependent. Clinical Significance: Mechanical properties of light‐cured, bulk‐fill materials may be affected by inadequate polymerization. Clinicians should consider complementary strategies to achieve adequate polymerization at high‐increment depths.
- Subjects
STATISTICS; OPERATIVE dentistry; DENTAL resins; ANALYSIS of variance; DENTAL materials; ONE-way analysis of variance; TENSILE strength; POLYMERS; DENTAL fillings; VISCOSITY; DATA analysis; PEDIATRIC dentistry
- Publication
Journal of Esthetic & Restorative Dentistry, 2021, Vol 33, Issue 4, p628
- ISSN
1496-4155
- Publication type
Article
- DOI
10.1111/jerd.12727