Fracture toughness of dental incremental composite-composite interfaces at elevated temperatures

Maier E, Loumprinis N, Belli R, Petschelt A, Eliades G, Lohbauer U (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Journal of the Mechanical Behavior of Biomedical Materials Elsevier

Book Volume: 122

Article Number: 104655

DOI: 10.1016/j.jmbbm.2021.104655

Abstract

The aim of the present laboratory study was to mechanically characterize the interface between two dental resin-based composite (RBC) increments, and to investigate if elevated temperatures have an influence on the quality of the interface mimicking clinical filling procedure. Four RBCs (CLEARFIL MAJESTY™ Posterior, Kuraray (CMP)/Filtek™ Supreme XTE, 3M (FSX)/Grandio®SO, VOCO (GSO)/VisCalor® bulk, VOCO (VCB)) were tested with a fracture toughness test using Chevron notched beams (KI,CNB) at 23, 37 and 54 °C. KI,CNB specimens (3 × 4x25mm) with a V-shaped notch at the incremental interface were loaded until failure in a 4-point bending set-up. Failure modes were characterized using light microscopy, microstructural interface was analyzed using SEM. Statistical analysis was performed using Kolmogorov-Smirnoff test, two-way ANOVA and Tukey Post-Hoc test (p = 0.05). Mean KI,CNB ranged between 0.73 ±0.14 MPam^0.5 (VCB, 23 °C) and 1.11 ± 0.11 MPam^0.5 (FSX, 23 °C). The tested conventional highly filled RBCs presented fracture toughness at the incremental interface comparable to the cohesive strength of the bulk materials. VCB showed reduced interfacial fracture toughness at 23 and 37 °C, but performed well at elevated temperature of 54 °C.

Authors with CRIS profile

Eva Maier Department of Operative Dentistry and Periodontology Renan Belli Department of Operative Dentistry and Periodontology Anselm Petschelt Medizinische Fakultät Ulrich Lohbauer Medizinische Fakultät

Involved external institutions

National and Kapodistrian University of Athens

Greece (GR)

How to cite

APA:

Maier, E., Loumprinis, N., Belli, R., Petschelt, A., Eliades, G., & Lohbauer, U. (2021). Fracture toughness of dental incremental composite-composite interfaces at elevated temperatures. Journal of the Mechanical Behavior of Biomedical Materials, 122. https://doi.org/10.1016/j.jmbbm.2021.104655

MLA:

Maier, Eva, et al. "Fracture toughness of dental incremental composite-composite interfaces at elevated temperatures." Journal of the Mechanical Behavior of Biomedical Materials 122 (2021).

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