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Journal of Dental Research
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Effects of Dentin Surface Treatments on the Fracture Toughness and Tensile Bond Strength of a Dentin-Composite Adhesive Interface

L.E. Tam

Department of Restorative Dentistry, Centre for Biomaterials, Faculty of Dentistry, 124 Edward Street, Toronto, Ontario, Canada M5G 1G6

R.M. Pilliar

Department of Restorative Dentistry, Centre for Biomaterials, Faculty of Dentistry, 124 Edward Street, Toronto, Ontario, Canada M5G 1G6

It has been proposed that the fracture toughness test provides an appropriate method for assessing the fracture resistance of the dentin-composite interface. The plane-strain fracture toughness test was therefore applied to a dentin-composite interface, with use of a specific dentinal adhesive, so that the effects of various dentin surface treatments on dentin-bond integrity could be studied. Interfacial fracture toughness (KIC) values were determined following 24 h and 180 days of specimen aging in distilled water at 37*C. Tensile bond strength (TBS) results following 24-hour aging were also obtained for comparison with the 24-hour KIC results.

In general, the fracture resistance of the dentin-composite interface was highest when the dentin surface was conditioned with acid but not air-dried, intermediate when the dentin surface was conditioned with acid and subsequently air-dried, and lowest when the dentin was not conditioned with acid. The tensile bond strength results differed from the fracture toughness results in indicating differences in surface preparation effects and the type of interfacial failure observed.

Key Words: Bonding • Dental • Dental Materials • Failure of Dental Materials • Fractures.

Journal of Dental Research, Vol. 73, No. 9, 1530-1538 (1994)
DOI: 10.1177/00220345940730090801
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