Original scientific paper
https://doi.org/10.15644/asc52/4/3
Dimensional Changes of Glass Ionomers and a Giomer during the Setting Time
Jelena Spajić
; Health Center, Runjaninova 4, Zagreb, Croatia
Katica Prskalo
; Department of endodontics and restorative dental medicine School of Dental Medicine University of Zagreb, Gundulićeva 5, Zagreb, Croatia
Kristina Šariri
; Institut za fiziku, Bijenička 46, Zagreb
Matej Par
; Department of endodontics and restorative dental medicine School of Dental Medicine University of Zagreb, Gundulićeva 5, Zagreb, Croatia
Vlatko Pandurić
; Department of endodontics and restorative dental medicine School of Dental Medicine University of Zagreb, Gundulićeva 5, Zagreb, Croatia
Nazif Demoli
; Institute of Physics, Bijenička 46, Zagreb, Croatia
Abstract
Objectives: The aim of this study was to evaluate dimensional changes of conventional glass ionomer cements, resin-modified glass-ionomer cement, and a giomer during the setting time using digital laser interferometry. Additionally, the influence of different curing modes (“high”, “soft”, and “low”) of a light-emitting diode (LED) curing unit on dimensional changes was evaluated. Materials and methods: Linear curing shrinkage of conventional glass ionomer cements (CGICs): Fuji IX Extra (F9E), Fuji IX Fast (F9F), Ketac Molar Aplicap (KM), Ketac Molar Quick Aplicap (KMQ), resin-modified glass ionomer cement (RM GIC): Fuji II LC (F2LC) and giomer: Beautifil II (B2) was analyzed. All tested
materials were of shade A3, while all of the GIC were encapsulated. Discoid specimens (n=10, d=10 mm, h=0.85 mm) were prepared for each tested material and each curing mode (for light-curable materials)
according to the manufacturer’s instructions. Light-curable specimens were cured with LED curing unit (Bluephase G2, Ivoclar-Vivadent, and Schaan, Liechtenstein). Dimensional changes during curing were recorded in real-time. The results were analyzed by ANOVA, and Tukey post hoc test was used for multiple comparisons (α < 1%). Results: All tested materials showed an initial setting expansion and a subsequent setting shrinkage. KM and KMQ had significantly lower setting shrinkage
than RM GIC polymerized using any of the three curing modes. B2 showed lower shrinkage compared to F2LC. Conclusions: The extent of curing shrinkage in RM GIC measured in this study can affect longevity of restorations.
Keywords
Glass Ionomer Cements; Dental Curing Lights; Dental Materials; Polymerization; Setting Shrinkage
Hrčak ID:
213463
URI
Publication date:
19.12.2018.
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