Bonding of Composite Resin to Contaminated Human Enamel and Dentin |
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| Authors: | John M. Powers,PhD,Werner J. Finger,DDS,PhD,&dagger ,Jianxiu Xie,DDS,MS,&Dagger |
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| Affiliation: | Professor, Department of Basic Sciences–Oral Biomaterials, University of Texas–Houston Health Science Center, Dental Branch, Houston, TX.;Professor, Department of Prosthetic Dentistry, Dental School of Rhein.-Westf. Technische Hochschule Aachen, Zahn-, Mund-und Kieferklinik, Aachen and Bayer AG, Dormagen, Germany.;Research Fellow, Department of Basic Sciences–Oral Biomaterials, University of Texas–Houston Health Science Center, Dental Branch, Houston, TX. |
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| Abstract: | ![]()
Purpose The purpose of this in vitro study was to evaluate the bond strengths of a bonding agent and composite resin system to human enamel and dentin treated with five contaminants (saliva, plasma, zinc oxide–eugenol cement, noneugenol zinc oxide cement, and handpiece lubricant) using air, moisture, and water as controls. Materials and Methods A commercial bonding agent (Gluma 2000; Bayer AG, Dormagen, Germany) and its composite (Pekafill; Bayer AG) were applied to tooth structure under two conditions (contaminated and re-etched). Samples were debonded in tension after 24 hours using an inverted, truncated cone bond test. Results Among the controls, the highest bond strengths were obtained to enamel (20 MPa) and dentin (12 MPa) with air drying. Contaminants lowered the bond strength by 20% to 100%. Re-etching without additional mechanical preparation resulted in bond strengths similar to the air control. Conclusions Bond strength of Gluma 2000/Pekafill to tooth structure is sensitive to common forms of contamination but can be improved by re-etching after contamination occurs. |
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| Keywords: | bond strength composite dentin enamel dentin bonding agent |
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