| dc.description.abstract | ABSTRACT
Introduction: There are various restoration materials, one of which is microhybrid composite
resin. An effective way to increase its compressive strength is by applying glycerin before
curing. This can minimize the formation of a layer of OIL (Oxygen inhibition layer) which is
formed due to polymerization that interrupted by the contact of composite resin with oxygen.
Exposure with acidic solution such as pure coffee solution causing the occurrence of matrix
degradation which can decrease the compressive strength of microhybrid composit. The longer
its immersed in pure coffee solution, the more polymer bonds are broken and releasing
monomer which result in a decrease of compressive strength. Objective: This study aimed to
reveal the effects of glycerin application on the compressive strength of microhybrid composite
resins immersed in pure coffee solution. Methods: There are 6 sample groups of composite
resin namely: group SG, group S, group GK16, group K16, group GK32, and group K32 with 4
samples per group. Each sample made of microhybrid composite resin brand Filtek Z250
shaped disc with a diameter of 4 mm and thickness of 2 mm. Glycerin was applied to the
surfaces of three groups before curing, while other groups were not. After treatment, all
samples are compressive strength tested using Universal Testing Machine. The data were
analyzed using the Two Way ANOVA followed by Post-Hoc LSD test. Result: The groups
with glycerin had higher compressive strength than those groups without glycerin application.
The non-immersed groups had a higher hardness level than those groups which were
immersed. The Two-Way ANOVA test confirmed that there was a statistically significant
difference (p<0.05) among all groups. Conclusion: Glycerin application can increase the
compressive strength of microhybrid composite resin immersed in pure coffee solution by
minimizing OIL formation on its surface. | en_US |
