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Regional Strengths of Bonding Agents to Cervical Sclerotic Root Dentin

Department of Conservative Dentistry, Tokushima University, 3-18-15, Kuramoto-cho, Tokushima 770, Japan

H. Sano

Department of Operative Dentistry, Tokyo Medical and Dental University 5-45, 1-chrome, Yushima, Bunkyo-ku, Tokyo 113, Japan

S. Ebisu

Department of Conservative Dentistry, Tokushima University, 3-18-15, Kuramoto-cho, Tokushima 770, Japan

J. Tagami

Department of Operative Dentistry, Tokyo Medical and Dental University 5-45, 1-chrome, Yushima, Bunkyo-ku, Tokyo 113, Japan

B. Ciucchi

Department of Restorative Dentistry and Endodontics, University of Geneva, 19 rue Barthelemy-Menn, CH-1211, Geneva 4, Switzerland

R.M. Carvalho

Department of Operative Dentistry, Bauru School of Dentistry, University of Sao Paulo, Sao Paulo, Brazil

M.H. Johnson

Office of Biostatistics, Medical College of Georgia, Augusta, Georgia, USA

D.H. Pashley

Department of Oral Biology, School of Dentistry, Medical College of Georgia, Augusta, Georgia 30912-1129, USA

The regional bond strengths of three current-generation bonding systems (All Bond 2, Scotchbond MultiPurpose, and Clearfil Liner Bond 2) were measured in natural wedge-shaped defects in the cervical area of extracted human teeth. A microtensile testing method was used to compare the strengths of resin bonds made to occlusal margins with those made to gingival margins. Controls consisted of normal teeth which had artificial wedge-shaped defects, of the same depth and dimension, created with a high-speed bur. The results indicated that there were no regional differences in bond strength, although bonds made to natural lesions were from 20 to 45% lower than those made to normal dentin in artificially created wedge-shaped defects, depending on the bonding agent. Scanning electron microscopy revealed that Clearfil Liner Bond 2 created the thinnest hybrid layers, which were difficult to measure in the natural lesions. The natural lesions contained sclerotic dentin, whereas the artificial lesions were composed of normal dentin. Although the bond strengths to sclerotic dentin were lower than those to normal dentin, the absolute values (ca. 16 to 17 MPa) were high relative to previous-generation bonding agents.

Key Words: sclerotic dentin • root dentin • dentin bonding • resin adhesion

Journal of Dental Research, Vol. 75, No. 6, 1404-1413 (1996)
DOI: 10.1177/00220345960750061201


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