Effect of Clear Silicone Matrix Thickness on Microhardness of Composite Resin Provisional Restoration
The objective of this study was to study the effect of the clear silicon matrix thickness on knoop microhardness of dual-cured composite resin provisional restoration. The samples were divided into four groups according to the thickness of the clear silicone : no silicone, 2, 4 and 6 mm respectively used as a barrier between the optical fiber of light curing unit and provisional restoration. The samples were treated with a visible light curing unit for 40 seconds. The Knoop hardness number was compared with microhardness tester in each sample at a depth of 0, 2, 4 and 6 mm. with a load of 25 gram for 10 seconds. The microhardness tested were analyzed with a two-way analysis of variance. The result of this study, the clear silicone thickness significantly affected the knoop hardness number of the provisional restoration at the depth of 0 mm (p<0.05). But the clear silicone thickness were not affected the provisional restoration at the depth of 2, 4, and 6 mm between some groups (p<0.05). Application of clear silicone as a matrix for fabricating provisional restorations clinically need to have more exposure time of light from light curing unit for increasing the hardness when the patient clinically used.
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