In visible light-cured composite, the prevailing part
of the increase in hardness was observed in the first few
minutes after irradiation, even though the optimum
hardness of the light-cured composite is achieved 1
day after light curing.12,13 In our study, the microhardness
of the celluloid strip–finished composite sur-
face increased more progressively. The finding is in
partial agreement with the observation of Helvatjoglou
et al,3 who reported a progressive increase of
microhardness of the celluloid strip–finished composite
surface at 4 weeks.