Incomplete resin composite polymerization is also responsible for post-operative sensitivity (4). Problems associated with inadequate polymerization include inferior physical properties, diminished retention, greater degradation in the oral environment and adverse pulp responses. In clinical practice, only one appliance is bought and used to polymerize all the materials available in the dental office, as it is not possible for dentists to suit their appliances to the different materials. Inadequate power due to degradation of the components (bulbs, reflectors, filters and light conducting tips), which occurs with use over time, contributes to difficulties in polymerizing these materials