Original scientific paper
https://doi.org/10.15644/asc53/4/2
Compressive Strength of New Glass Ionomer Cement Technology based Restorative Materials after Thermocycling and Cyclic Loading
Valentina Brzović Rajić
; Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Gundulićeva 5, 10000 Zagreb, Croatia
Ana Ivanišević Malčić
orcid.org/0000-0002-1380-0029
; Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Gundulićeva 5, 10000 Zagreb, Croatia
Zeynep Bilge Kütük
; Department of Restorative Dentistry, School of Dentistry, Hacettepe University, Ankara 06100, Turkey
Sevil Gurgan
; Department of Restorative Dentistry, School of Dentistry, Hacettepe University, Ankara 06100, Turkey
Silvana Jukić Krmek
; Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Gundulićeva 5, 10000 Zagreb, Croatia
Ivana Miletić
; Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Gundulićeva 5, 10000 Zagreb, Croatia
Abstract
Objective: The objective of the study was to compare compressive strengths of two glass ionomerbased materials, with and without a light-cured, nano-filled coating, after cyclic loading and thermocycling.
Materials and methods: To determine compressive strength of new restorative materials over a longer period of time, materials were analysed under simulated conditions where cyclic loading replicated masticatory loading and thermocycling simulated thermal oscillations in the oral cavity. Four groups of samples (n=7)—(1) Equia Fil (GC, Tokyo, Japan) uncoated; (2) Equia Fil coated with Equia Coat (GC, Tokyo, Japan); (3) Equia Forte Fil (GC, Tokyo, Japan) uncoated; and (4) Equia
Forte Fil coated with Equia Forte coat (GC, Tokyo, Japan)—were subjected to cyclic loading (240,000 cycles) using a chewing simulator (MOD, Esetron Smart Robotechnologies, Ankara, Turkey). Results: Compressive strength measurements were performed according to ISO 9917-1:2007, using the universal mechanical testing machine (Instron, Lloyd, UK). Scanning electron microscope (SEM) analysis was performed after thermocycling. There were no statistically significant differences between Equia Fil and Equia Forte Fil irrespective of the coating (p<0.05), but a trend of increasing compressive strength in the coated samples was observed. Conclusions: Coating increases the compressive
strength of Equia Fil and Equia Forte Fil, but not significantly.
Keywords
Glass Ionomer Cements; Compressive Strength; Hardness Tests; Mastication
Hrčak ID:
230329
URI
Publication date:
19.12.2019.
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