Effects of the bleaching procedures on enamel micro-hardness: Plasma Arc and diode laser comparison.

Background And Aims: One of the major side effects of vital bleaching is the reduction of enamel micro-hardness. The purpose of this study was to evaluate the influence of two different bleaching systems, Plasma Arc and GaAlAs laser, on the enamel micro-hardness.

Materials And Methods: 15 freshly extracted human third molars were sectioned to prepare 30 enamel blocks (5×5 mm).