The authors tested the shear strength in teeth subjected to two bleaching techniques with use of 50 upper central incisors divided into 5 groups, namely: control (intracoronal access only), bleaching without heat, bleaching catalyzed by controlled heat, bleaching catalyzed by controlled heat and restored with last generation composite resin, and sound teeth. Following the shearing test it was observed that teeth subjected to dental bleaching with sodium perborate/Peridrol with or without applications of controlled heat, although they presented a slight reduction in shear strength, this was not statistically significant as compared to that from teeth where endodontic access was effected without bleaching. Restoration of the tooth subsequently to dental bleaching with fourth generation dentinal adhesive and photopolymerized resin augments the resistance of the bleached dental element. There are no statistical differences between resistance to shear in bleached teeth without the use of heat with those where heat was employed in a controlled form as preconized in this study. Sound teeth present greater resistance than teeth bleached with heat, without heat, and those not bleached with statistical significance at the level of 5%. When compared to teeth bleached and restored, they did not present significant statistical differences
Endodontics; Dental bleaching
