title: A pilot study of exposure of the smear layer to tannic acid solutions.
abstract: This study examined the effects of tannic acid on smear layer removal. Class V cavities were prepared on the buccal surfaces of extracted human molars with a No. 1557 high-speed carbide bur under water cooling for cutting and a No. 701 low-speed steel bur for finishing. They were then washed with water followed by an application of 2%, 5%, 10%, 15%, 20%, or 25% tannic acid solution in water for 15, 30, or 60 seconds. The axial wall dentin surfaces were examined with scanning electron microscopy. This examination showed that an application of 2% tannic acid for 60 seconds or 5% tannic acid for 15, 30, or 60 seconds effectively removed the smear layer, leaving the dentinal tubules occluded. The dentinal surfaces treated with 40% phosphoric acid for 15 seconds showed many exposed dentinal tubules with flared orifices.
authors.affiliation: Department of Operative Dentistry, Hiroshima University School of Dentistry, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Takahashi
authors.forename: Y
authors.initials: Y
authors.lastname: Okamoto
authors.forename: S
authors.initials: S
authors.lastname: Fujinaka
authors.forename: H
authors.initials: H
authors.lastname: Shintani
mesh_terms: D000134:Acid Etching, Dental; D003804:Dentin / Q000187:drug effects* / Q000648:ultrastructure; D003806:Dentin Permeability / Q000187:drug effects*; D006801:Humans; D047348:Hydrolyzable Tannins / Q000494:pharmacology* / Q000627:therapeutic use; D008855:Microscopy, Electron, Scanning; D010865:Pilot Projects; D016369:Smear Layer
chemical_list: D047348:Hydrolyzable Tannins