Effects of Curing Time on Compressive Strength of Hybrid Ionomer (In Vitro Study)

Abstract

<p class="AbstractContent"><strong>Objective:</strong> The aim of this study was to investigate the compressive strength of hybrid ionomer with different curing times which are 20 seconds, 30 seconds, 40 seconds and 50 seconds.</p><p class="AbstractContent"><strong>Methods:</strong> This was an experimental laboratory study with posttest only group design. With the total of 24 samples of hybrid ionomer specimens with disk shape (5mm in diameter and 2mm in thickness) were prepared and polymerized using Quartz Tungsten Halogen (QTH) for each group (n=6) of different curing times 20 seconds, 30 seconds, 40 seconds and 50 seconds respectively. All samples were immersed in distilled water with a dark container and stored in incubator at 37°C for 24 hours before the test. Compressive strength test was done by Universal Testing Machine with crosshead speed of 0.5mm/min. All data were analyzed by one way - ANOVA.</p><p class="AbstractContent"><strong>Results:</strong> The mean and standard deviation of the compressive strength of hybrid ionomer with the curing times 20seconds, 30 seconds, 40 seconds and 50 seconds were 45.6± 0.4648MPa, 46.8 ± 0.8165MPa, 48.5 ± 0.4037MPa, 50.2 ± 0.5193MPa respectively. Statistic analyze showed there was significant difference between the effect of curing time of the compressive strength of hybrid ionomer.</p><p class="AbstractContent"><strong>Conclusion</strong>: The increase of curing times will result an increase of compressive strength of hybrid ionomer.</p>