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Influence of Luting Material Filler Content on Post Cementation

¹ Department of Fixed Prosthodontics and Dental Materials, University of Siena, Italy;
² Department of Operative Dentistry, University of São Paulo, Bauru School of Dentistry, Bauru, Brazil;
³ Department of Biomedicine, Unit of Dental Sciences and Biomaterials, University of Trieste, Via Stuparich, 1, I-34125 Trieste, Italy;
⁴ Department of SAU&FAL, University of Bologna, Italy; and
⁵ IGM-CNR, Unit of Bologna c/o IOR, Bologna, Italy

Correspondence: ^* lbreschi{at}units.it

Luting of fiber posts to intra-radicular dentin represents the worst-case scenario in terms of control of polymerization shrinkage. This study tested the hypothesis that filler content of resin cements does not influence luting of fiber posts to intra-radicular dentin, by assaying polymerization stress, push-out bond strength, and nanoleakage expression. The polymerization stress of experimental cements containing 10%, 30%, 50%, or 70% in filler content was investigated. Post spaces were prepared in endodontically treated teeth, and fiber posts were cemented with the experimental cements. A push-out test was performed, and interfacial nanoleakage expression was analyzed. Results showed that luting cements with higher filler content were related to increased polymerization stress (p < 0.05), decreased push-out bond strength (p < 0.05), and increased interfacial nanoleakage expression (p < 0.05). Conversely, lower-stress luting materials increased bonding of fiber posts to intra-radicular dentin. Further in vivo studies are needed to investigate the long-term clinical performance of these materials.

Key Words: fiber post • resin-based cement • push-out bond strength • nanoleakage • polymerization stress

Journal of Dental Research, Vol. 88, No. 10, 951-956 (2009)
DOI: 10.1177/0022034509342851


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