%0 Journal Article
%T Effect of Bench Time on Surface Hardness of Nanofiller Composite Resin
%A Astrid Yudhit
%A Febby Revita Sari
%A Kholidina Im
%A a Harahap
%J International Journal of Dental Sciences and Research
%D 2019
%R 10.12691/ijdsr-7-1-4
%X The purpose of this study was to evaluate the effect of different bench time on surface hardness of the composite resin after being stored in the refrigerator at 4£¿£¿C. Before used in this study, the composite resin was refrigerated at 4£¿£¿C for the test group and kept at 25£¿£¿C for the control group. The specimens were divided into control group (I) and five experimental groups according to the bench time before polymerization, 0 (II); 15 (III); 30 (IV); 45(V); and 60 (VI) minutes. Sixty specimens with 10 mm diameter and 2 mm thickness were made by using nanofiller composite resin. The material was filled into stainless steel mold and curing for 20 s. After kept in a dark box for 24 hours, the surface hardness of all specimens were tested using Microhardness Tester. The data were analyzed with one-way ANOVA (p£¿¨¹0.05) and LSD£¿¡¥s post hoct test. The results showed that the 60 minute bench time group presented the highest surface hardness value followed by 45, 30, 15 and 0 minutes bench time group. Moreover, the hardness value of 60 min group was almost similar with the control group. Statistical analysis showed no significant differences (p>0.05) between groups. It concluded, bench time has an effect on the surface hardness of composite resin but no significant differences statistically
%U http://www.sciepub.com/IJDSR/abstract/10525