Objective: The aim of this study was to evaluate the surface hardness of hybrid ionomer with different curing times (20, 30, 40, and 50 seconds). Methods:This was an experimental laboratory with posttest only group design. Twenty-four disk shape hybrid ionomer specimens with a diameter of 5 mm and 2 mm in thickness were prepared and polymerized with Quartz Tungsten Halogen (QTH) for 20, 30, 40, and 50 seconds as group 1, 2, 3, and 4 respectively. All samples were immersed in distilled water under 37°C temperature for 24 hours as initial treatment. Surface hardness test was done using Vickers Hardness Test with load 50 gf for 20 second. The Data was analyzed with one way ANOVA (p ≤ 0.05).Results: Using one way anova test (p ≤ 0.05) shows the mean and standard deviation of the group 1 is 25,900 ± 2,5659VHN; group 2 is 29,800 ± 1,1983 VHN; group 3 is 31,283 ± 0,5037 VHN; group 4 is 36, 183 ± 2,3430 VHN and the obtained value p = 0.000 (p ≤ 0.05).The mean values and standard deviation were 25.900 ± 2.5659 VHN; 29.800 ± 1.1983 VHN; 31.283 ±0.5037 VHN; 6.183 ± 2.3430 VHN for group 1, 2, 3, and 4 respectively. Statistic analyzed showed a significant different among groups with p value =0.000 (p < 0.05). Conclusion:There are significant differences in surface hardness of hybrid ionomer with different curing time (20, 30,40, and 50 seconds). The longer curing time will increase the surface hardness of hybrid ionomer.
The existence of composite resin as dental restorative materials in the mouth will always be exposed to temperature changes from food or drink. The purpose of this study was to evaluate the effect of temperature on water absorption and solubility of the composite resin. Thirty samples made from nanofiller composite resin with a diameter of 15 mm and a thickness of 1 mm. The samples were divided into three test groups (n=10) that is immersed at 50 (I), 37 (II) and 5 °C (III). The testing procedure of water sorption and solubility of the composite resin made according to the ISO 4049: 2000 specifications. Data will be analyzed by one-way ANOVA and Least Significance Data test (p=0,05). The results showed there is significant differences of the water sorption (p=0,045) and solubility (p=0,018). The highest water sorption is group I (0,0057±0,007µg/mm3) than group II (0,0028±0,0013 µg/mm) and group III (0,0005±0,0006 µg/mm). While the heighest solubility values are in group I (0,003 ± 0,0027 µg/ mm), than group II (0,002 ± 0,0013 µg/mm) and group III (0,001 ± 0,00 µg/mm). It can be concluded that temperature could increase water sorption and solubility of composite resin.
Objective: 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. Methods: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. Results: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. Conclusion:The increase of curing times will result an increase of compressive strength of hybrid ionomer.
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