Abstract
The study was carried out to compare the Vickers Micro-Hardness (VHN) of composite resin of different diameters (6 mm and 10 mm) prepared in a split mold. The 6 mm and 10 mm diameter composite resin samples were cured with the tip of a fiber optic light. Additional sample for same size were cured with the same tip after a mirror or a lens accessory was mounted to it. All the specimens were cured for 40 seconds. The hardness was calculated for both top and bottom at the center and the periphery. The results showed that the hardness of top surface was higher than that at the periphery. The mean hardness value for specimens cured with the light tip was higher than the hardness of specimens cured with their accessory. Conclusion mirror or lens didn’t potentiate light but distribute the energy to a larger area, resulting in less energy applied to the same small surface area, which reduced the hardness.
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