Depth of Cure, Mechanical Properties and Morphology of Dual-Cure Bulk-Fill Composites

Ayca Sarialioglu Gungor; Ali Durmus; Belma Zengin Kurt; Safiye Selin Köymen; Nazmiye Dönmez

doi:10.15517/ijds.2022.52970

Vol. 25 No. 1 (2023), Original Basic Research Articles

Vol. 25 No. 1 (2023)

Depth of Cure, Mechanical Properties and Morphology of Dual-Cure Bulk-Fill Composites

Original Basic Research Articles

https://doi.org/10.15517/ijds.2022.52970

Published October 31, 2022 — Updated on December 1, 2022

Ayca Sarialioglu Gungor⁺⁻
Ali Durmus⁺⁻
Belma Zengin Kurt⁺⁻
Safiye Selin Köymen⁺⁻
Nazmiye Dönmez⁺⁻

Ayca Sarialioglu Gungor

Assistant Professor, Istanbul Galata University, Faculty of Dentistry, Department of Restorative Dentistry, Istanbul, Turkey

Ali Durmus

Professor, Istanbul University, Faculty of Engineering, Department of Chemical Engineering, Cerrahpasa, Istanbul, Turkey

Belma Zengin Kurt

Associate Professor, Bezmialem Vakif University, Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Istanbul, Turkey.

Safiye Selin Köymen

Assistant Professor, Medipol University, Faculty of Dentistry, Department of Restorative Dentistry, Istanbul, Turkey

Nazmiye Dönmez

Professor, Bezmialem Vakif University, Faculty of Dentistry, Deparment of Restorative Dentistry, Istanbul, Turkey

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Keywords

Resin composite; Fourier-transform infrared spectroscopy; Microhardness; Compression strength; Scanning electron microscopy; Degree of conversion.
Resina compuesta; Espectroscopia infrarroja de Fourier; Microdureza; fuerza comprensiva; Microscopía electrónica de barrido; Grado de conversión.

How to Cite

Sarialioglu Gungor, A., Durmus, A., Zengin Kurt, B., Köymen, S. S., & Dönmez, N. (2022). Depth of Cure, Mechanical Properties and Morphology of Dual-Cure Bulk-Fill Composites. Odovtos - International Journal of Dental Sciences, 25(1), 72–87. https://doi.org/10.15517/ijds.2022.52970

Abstract

This study evaluated selected structural and physical properties, such as degree of conversion (DC), Vickers hardness (VHN), and compression strength (CS), of three new dual-cure bulk-fill resin-based composites (RBCs; ACTIVA, HyperFIL, and Fill-Up) and compared them to those of a conventional RBC (Filtek Z250) at three clinically relevant depths. Samples (n=180) were prepared in three depths (2,4, and 6mm). Fourier-transform infrared spectroscopy (FTIR) analysis and VHN and CS tests were performed. The DC value was calculated by considering the relative change in the aliphatic C=C peaks. The fractured surfaces of representative samples were characterized using scanning electron microscopy (SEM). Data were statistically evaluated using two-way analysis of variance and post hoc Bonferroni tests (p<0.05). According to the VHN results, Filtek Z250 showed the highest bottom/top hardness ratio (97.94±1.01) at 2mm thickness and ACTIVA showed the lowest bottom/top hardness ratio (43.48±5.64) at 6mm thickness (p<0.001). According to the FTIR results, the DC decreased with increasing thickness in all materials (p<0.05). Filtek Z250 showed the highest (301±12.4 MPa) and ACTIVA exhibited the lowest (232±17.2 MPa) CS values at 2mm thickness (p<0.05). The lowest CS values were obtained for ACTIVA, and the highest values were obtained for Filtek Z250 for samples with thicknesses of 4 and 6mm, respectively (p<0.05). The structural features of restorative composites, such as the resin chemistry and filler type and content, and the operational parameters (i.e., material thickness and curing conditions) strongly affect crosslinking reactions and thus the DC, VHN, and CS values.

https://doi.org/10.15517/ijds.2022.52970

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