Influência de agentes clareadores no tampão cervical realizado com cimento de ionômero de vidro modificado por resina

The purpose of this study was to evaluate in vitro the influence of three associations of bleaching agents upon intracoronal bleaching barriers using dye leakage. Forty-eight recently extracted intact human molars were used. All root canals were obturated with the lateral condensation technique using gutta-percha and Sealapex root canal cement. The intracoronal bleaching barrier tested was resin modified glass ionomer cement (3M) with 3mm of thickness. The specimens were divided into four groups according to bleaching agent: 1) control group, without bleaching agent, 2) sodium perborate with water, 3) sodium perborate with 10% carbamide