Objectives: The aim of this study was to evaluate the superficial micro hardness of a extra-light composite resin Charisma SL (Heraeus Kulzer/Germany) when photocured by four photocuring units: One being halogen based G1 (control group) - Optilux Demetron 401 (SDS Kerr/USA) and three LED units: G2 – L.E.Demetron I (SDS Kerr/USA); G3 – EliparTMFreeLightTM (3MESPE/USA) and G4 – ColtoluxLED (ColtèneWhaledent/Germany). Methods: Five specimens were made for each evaluated group. The composite resin was photocured in only one increment for 40 seconds. After that, the specimens were stored in the dark for 24 hours. Later, they were evaluated to check the superficial micro hardness (Vickers Hardness – HV) by using the hardness device HMV-2 (Shimadzu) on the top and bottom surfaces. Results:The results showed in HV: G1- 42.28±1.09; G2 - 41.66±0.93; G3 - 40.54±0.87 and G4 - 37.19±0.85 on the top surface and on the bottom surface the results in HV were: G1 - 33.80±4.58; G2 - 36.81±0.70; G3 - 32.79±0.98 e G4 - 31.40±0.93. Through analysis statistical Analysis of Variance (ANOVA) to 2 criteria and test LSD for multiple comparisons to 5%, it was shown there was differences between the top (40.42±2.19) and the bottom (33.70±3.01) and between the photocuring units with p<0,0001. Conclusion: It was concluded that there was not statistically significant Vickers micro hardness value only between G1 and G2. In all the groups the values were higher on the top surface. Supported by PIBIC / UEPG / CNPq – Brazil.

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