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and Aim: Excessive heat produced while curing of light-activated dental restorations may cause irreversible damage to dental pulp. The Aims of this study wereto measure the temperature rise(TR) induced by two different light curing units and to evaluate the relathionship between the measured TR in dentin discs of different thicknesses and different distances of light guide tips from dentin disc. Materials and Methods: In this experimental study, Quartz-Tungsten-Halogen (QTH) (400) andfatcat:53jihbynvveqxf7sdlj6etqaem