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Journal of Dental Research
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Parameters that Affect in vitro Bonding of Glass-ionomer Liners to Dentin

M.M. Barakat

Al Azhar University, Cairo, Egypt

J.M. Powers

School of Dentistry, The University of Michigan, Ann Arbor, Michigan 48109-1078

R. Yamaguchi

The Nippon Dental University, School of Dentistry at Niigata, Niigata, Japan

The purpose of this study was to evaluate the effects of two concentrations of poly (acrylic acid) (10 and 25%), three treatments (untreated, passive conditioning, and active conditioning), and two storage conditions (24 hours in 37°C water and thermal cycling) on the in vitro tensile bond strength of three commercial glass-ionomer liners to human dentin. Bond strengths to untreated dentin after storage for 24 hours ranged from 19.0 to 21.7 kg/cm2 for Glasionomer Base Cement, Cement/Liner, and Ketac-Bond, but dropped to a range of 4.9 to 9.7 kg/cm2 after thermal cycling. Active conditioning with 10% acid resulted in bond strengths after 24-hour storage that ranged from 23.5 to 44.0 kg/cm2, compared with values from 21.7 to 38. 0 kg/cm2 with active conditioning using 25% acid. Active conditioning with 10% acid resulted in bond strengths after thermal cycling that were in the range of 15.8 to 27.4 kg/cm2 and were 80 to 320 percent higher than values resulting from passive conditioning under these conditions. Active conditioning with 10% acid for 30 seconds produced a bond strength for Glasionomer Base Cement of 44.0 kg/cm2, compared with a bond strength of 28.7 kg/cm2 for a 10-second active conditioning. Qualitative analysis of scanning electron photomicrographs showed that dentin tubules were opened to a greater extent by active conditioning with 25% acid than by passive conditioning with 10% acid.

Journal of Dental Research, Vol. 67, No. 9, 1161-1163 (1988)
DOI: 10.1177/00220345880670090401
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S.B. Mitra
Adhesion to Dentin and Physical Properties of a Light-cured Glass-ionomer Liner/Base
Journal of Dental Research, January 1, 1991; 70(1): 72 - 74.
[Abstract] [PDF]