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Aim of study: The aim of the study was to evaluate depth of cure of light cured composite resin using three different modes of light curing systems a) Continuous mode b) Exponential mode c) Intermittent mode.
Materials & Method: The materials used were light curing system such as curing light 3M 2500 & Astralis7. The composite material used for testing was micro-filled hybrid composite material A3 shade. The apparatus used in test are Vicat polymer softening apparatus & composite curing test fixture.
Statistical Analysis Used: Statistical analysis of the data was done using the Tukey’ s test.
Results: The result of depth cure showed that intermittent method had highest depth of cure. The lowest depth of cure was showed by continuous mode of photo polymerization & had highly significant result when compared to intermittent & exponential. Intermittent versus exponential showed statistically significant result. No uncured resin was found in control group samples.
Conclusions: The study evaluates the depth of cure of micro hybrid composite resin used in different photo activation techniques. The result of study showed that depth of cure is strongly affected by photo activation methods.

Photo-activation methods, Composite resin, Light curing systems, Depth of cure