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Abstract

Objectives: To examine changes in shear bond strength to dentin (SBS), flexural strength (FS) and diametral tensile strength (DTS) of four restorative glass ionomer cements: Fuji II LC (GC/America), Equia (GC/America), Ketac Nano (3M/ESPE), and Ketac Molar (3M/ESPE) after aging in artificial saliva. Materials and Methods: For SBS testing, sound extracted human permanent molars were ground to flat occlusal dentin surfaces and fixed in circular molds with auto-cured acrylic resin.. Teeth were randomly divided into four groups: Fuji II LC, Equia, Ketac Nano, Ketac Molar. For each dentin surface, two glass ionomer cylinders were bonded. Specimens were stored in artificial saliva (37°C) and tested at 24-hour and 6-month time points (Shear Testing Machine, Bisco). For each material, FS bars (25mm x 2mm x 2mm) and DS discs (4mm x 2mm) were fabricated, stored in artificial saliva (37°C), and tested at 24-hour and 6-month time points. (Shimadzu). An additional FS study was conducted with glass ionomer specimens, stored either in distilled water or artificial saliva (37°C), and tested at 24-hour and 2-month time points. (Shimadzu). Data analysis included two-way ANOVA (p