<![CDATA[Bulk-fill composite resin is the latest technology that can be directly applied to the 4 mm deep without incremental technique. This resin composite bulk-fill contains ivocerin which more reactive than conventional composite resin photo initiator. Resin composite polymerization is obtained by using a light curing with several illumination techniques: stepped, ramped, and pulse. The purpose of this study is to determine the effect of these irradiations techniques to the ratio of top and bottom hardness value of bulk-fill composite resin. Composite resin bulk-fill samples were prepared in diameter 6 mm and 4 mm. Group I was irradiated by stepped techniques, group II with ramped techniques, and group III with pulse technique (n = 5). Each group was irradiated for 10 seconds using a large light emiting diode (LED) light with 1000 mWcm2 at the same distance. Then, the samples were soaking in distilled water at 37oC for 24 hours, hardness test was performed on the top and bottom using a Micro Vicker Hardness Tester. Vickers ratio was obtained from the ratio of the bottom to the top of hardness value. Data were analyzed using statistical applications and use One Way Anova followed by Pos Hoc Tukey test. The results of this study found that the hardness value of stepped technique was 0,685±0.036 VHN, ramped technique was 0,744±0.023 VHN and pulse technique was 0,682±0.108 VHN. There was no significant difference between the stepped, ramped, and pulse techniques to the hardness of bulk-fill composite resin. Conclusions, the hardness of bulk-fill composite was no differ after irradiation by different techniques in LED light.]]>
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