Introduction: Because the light curing agent is a continuous use material that does not allow its sterilization, the dental surgeon should be used for some measures that may reduce the risk of cross infection through its use. Therefore, use asepsis to this physical and / or chemical barriers that may reduce the risk of contamination by the dental surgeon and the patient.Objective: This study verified the light intensity of light-curing devices and analyzed the influence of physical and / or physical barriers on the final intensity of actions by the devices. Method. 13 photopolymerizers from the Schuster Emitter AFIT brand were used for each of the five groups of readings for each group tested: without barriers, chemical barriers (70% alcohol), physical barriers (70% sugar, followed by the plastic bag). The intensity of the light will be verified through a calibrated radiometer of the brand ECEL RD-7.Results: After statistical analysis one can verify what was done when a barrier was not used with the groups that used physical barrier and with the group that made association of barriers. Conclusion:Regarding biosafety, an association of physical and tissue barriers, although they had lower irradiance results, ensure better protection of the devices and avoid cross-contamination without prejudicing the clinical procedures.

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