Due to the low compliance nature of the dental pulp, it is vulnerable to cavity preparation and restoration procedures. The vulnerability may be due to temperature increases within the pulp tissue generated by those procedures. Placement of composites includes the use of visible-light-cure lamps which emit heat and cause a temperature increase in the pulp. This study measured the temperature increase occurring in the pulp chamber with the placement of a two-surface posterior composite using six visible-light-cure lamps. The data indicate that the lamps vary in the amount of temperature increase generated from one to another; that the greater portion of the temperature increase occurred during the placement of the first layer of composite; and that one lamp caused significantly lower temperature increases.