The purpose of this study was to evaluate the quasi-static compressive strength and the compressive
fatigue limit of four different dental restorative materials, before and after aging in distilled water for 30 days. A conventional
glass ionomer cement (
Fuji IX GP; IG), a
zinc-reinforced
glass ionomer cement (
Chemfil rock; CF), a light curable resin-reinforced
glass ionomer cement (
Fuji II LC; LC) and a resin-based composite (
Quixfil; QF) were investigated. Cylindrical specimens (4mm in diameter and 6mm in height) were prepared according to the manufacturer׳s instructions. The compressive
fatigue limit was obtained using the staircase method. Samples were tested in distilled water at 37°C, at a frequency of 10Hz with 10(5) cycles set as run-out. 17
fatigue samples were tested for each group. Two-way ANOVA and one-way ANOVA followed by Tukey׳s post-hoc test were used to analyze the results. Among the four types of materials, the resin-based composite exhibited the highest compressive strength (244±13.0MPa) and compressive
fatigue limit (134±7.8MPa), followed by the light-cured resin reinforced
glass ionomer cement (168±8.5MPa and 92±6.6MPa, respectively) after one day of storage in distilled water. After being stored for 30 days, all specimens showed an increase in compressive strength. Aging showed no effect on the compressive
fatigue limit of the resin-based composite and the light-cured resin reinforced
glass ionomer cement, however, the conventional
glass ionomer cements showed a drastic decrease (37% for IG, 31% for CF) in compressive
fatigue limit. In conclusion, in the present study, resin modified GIC and resin-based composite were found to have superior mechanical properties to conventional GIC.