Abstract:Background: Endodontically treated teeth are subjected to discoloration which must be treated for aesthetic purposes without weakening of tooth structure.Methods: Intra-coronal bleaching using different bleaching agents was tested for affecting the fracture resistance of teeth in three different groups, group 1(n=17) treated with sodium perborate, group 2 (n=17) treated with spirulina extract using photodynamic theory, and group 3 (n=17) control group without bleaching. Fracture resistance of single-rooted ext… Show more
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