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Build-up and Repair of Light-cured Composites: Bond Strength

Department of Operative Dentistry, University of Iowa, Iowa City, Iowa 52242

K.C. Chan

Department of Operative Dentistry, University of Iowa, Iowa City, Iowa 52242

J.W. Reinhardt

Department of Operative Dentistry, University of Iowa, Iowa City, Iowa 52242

Interfacial bond strengths of light-activated composites were measured as a function of age using a transverse strength test. Bond strength between layers decreased with the age of the initial layer and reflected the setting curves of the composites. The highly-filled composites exhibited the greatest bond strengths. Uncut surfaces provided a better substrate for bonding than did ground surfaces. Use of a bonding agent on both uncut and ground surfaces improved bond strengths. Mean repair strengths of light-activated composites were similar to those of selfcuring composites. Composites with ground surfaces aged for one wk had mean repair strengths 27% of the cohesive strength without bonding agent and 48% with bonding agent.

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Journal of Dental Research, Vol. 63, No. 10, 1241-1244 (1984)
DOI: 10.1177/00220345840630101501


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