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Flexural strength and microhardness of bulk‐fill restorative materials
Author(s) -
Mendonça Beatriz Curvello,
SotoMontero Jorge Rodrigo,
Castro Eduardo Fernandes,
Pecorari Vanessa Gallego Arias,
Rueggeberg Frederick Allen,
Giannini Marcelo
Publication year - 2021
Publication title -
journal of esthetic and restorative dentistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.919
H-Index - 60
eISSN - 1708-8240
pISSN - 1496-4155
DOI - 10.1111/jerd.12727
Subject(s) - knoop hardness test , indentation hardness , materials science , flexural strength , composite material , glass ionomer cement , composite number , viscosity , universal testing machine , polymerization , ultimate tensile strength , microstructure , polymer
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.