Analyses by photoreflectance spectroscopy and Vickers hardness of conventional and laser-assisted tooth bleaching.

Purpose: To evaluate the in vitro effects of two bleaching products developed to be used with halogen or argon laser lights.

Methods: 20 human embedded third molars were cut into four parts resulting in 75 useful specimens. The specimens were divided at random into five groups and submitted to the traditional power bleaching procedure for enamel.