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Microtensile Bond Strengths of Two Adhesive Resins to Discolored Dentin after Amalgam Removal

¹ Department of Operative Dentistry, Faculty of Dentistry, Mahidol University, 6 Yothee Road, Rajthewee, Bangkok 10400, Thailand; and
² Cariology and Operative Dentistry, Tokyo Medical and Dental University, 5-45, 1-chome, Yushima, Bunkyo-ku, Tokyo, Japan

^* corresponding author, dtchn{at}mahidol.ac.th

Studies have reported the discoloration of dentin beneath amalgam restorations. The purpose of this study was to test the hypothesis that the bond strengths of adhesive resins to this discolored dentin are lower than those to normal dentin, and are related to the presence of metallic ions or corrosion products. Amalgam-filled extracted human teeth were used. After the removal of amalgam, the discolored dentin and surrounding normal dentin were bonded with Single Bond or Clearfil SE Bond and tested for microtensile bond strengths. The bond strengths of Single Bond and Clearfil SE Bond to normal dentin were greater than to discolored dentin. Clearfil SE Bond demonstrated higher bond strength to normal dentin than did Single Bond. However, no differences were found between the bond strengths to the discolored dentin of both adhesives. Elemental micro-analysis revealed various amounts of tin in all discolored dentin.

KEY WORDS: discolored dentin • corrosion products • amalgam • dentin bonding • hardness • tin