title: Considerations in intracoronal bleaching.
abstract: Intracoronal bleaching is a simple, useful procedure for restoring the colour of discoloured root-filled teeth that are not extensively restored. It is important to minimise the extraradicular diffusion of hydrogen peroxide, as excessive levels of hydrogen peroxide in conjunction with existing inflammatory changes in the periodontium predispose the tooth to external root resorption. To keep the levels of extraradicular diffusion of hydrogen peroxide below the safety limit, it is imperative that an effective intermediate base cement of at least 2 mm be placed at the level of the buccal cemento-enamel junction over the root-filling prior to bleaching. The use of 35% carbamide peroxide as the intracoronal bleaching agent seems to combine the safety of sodium perborate together with the efficacy of 35% hydrogen peroxide. As bleaching agents may reduce the composite-tooth bond of some adhesive systems, the post-bleaching composite restoration should be delayed for at least three weeks.
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore.
authors.forename: K C
authors.initials: KC
authors.lastname: Lim
mesh_terms: D001881:Borates / Q000627:therapeutic use; D002133:Calcium Sulfate / Q000627:therapeutic use; D000077463:Carbamide Peroxide; D001840:Dental Bonding; D003738:Dental Cements; D004338:Drug Combinations; D006801:Humans; D006861:Hydrogen Peroxide / Q000009:adverse effects / Q000627:therapeutic use; D016877:Oxidants / Q000627:therapeutic use; D010545:Peroxides / Q000627:therapeutic use; D011145:Polyvinyls / Q000627:therapeutic use; D012387:Root Canal Filling Materials / Q000627:therapeutic use; D012391:Root Resorption / Q000209:etiology / Q000517:prevention & control; D014073:Tooth Bleaching / Q000379:methods*; D019228:Tooth Crown; D014075:Tooth Discoloration / Q000188:drug therapy; D014508:Urea / Q000031:analogs & derivatives* / Q000627:therapeutic use; D015034:Zinc Oxide / Q000627:therapeutic use
chemical_list: D001881:Borates; D003738:Dental Cements; D004338:Drug Combinations; D016877:Oxidants; D010545:Peroxides; D011145:Polyvinyls; D012387:Root Canal Filling Materials; D000077463:Carbamide Peroxide; C020872:Cavit; D014508:Urea; D006861:Hydrogen Peroxide; D015034:Zinc Oxide; D002133:Calcium Sulfate; C027707:sodium perborate