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

Author:

Boyer D.B.1,Chan K.C.1,Reinhardt J.W.1

Affiliation:

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

Abstract

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.

Publisher

SAGE Publications

Subject

General Dentistry

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