| 0434 Influence of resin cement on strength of two ceramic materials | ||
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T. EL-GENDY1, A. ZUCKER2, and R. SEGHI1, 1Ohio State University, College of Dentistry, Columbus, USA, 2Ohio State University, USA Currently full thickness moderate strength glass-ceramics and high strength alumina and zirconia core ceramics are used in various dental restorative applications. The influence of the resin cement on these materials is believed to play a role in their clinical longevity. Objective: The purpose of this investigation was to evaluate the influence of the resin cement on a leucite-reinforced glass-ceramic (GC) (ProCad, Ivoclar/vivadent) and a dense sintered alumina (AL) core-like structure (McMaster Carr supplies). Methods: Ceramic disks from each of the two material groups were sectioned to approximately 1.5mm in thickness. Each group of materials was divided into two subgroups. One of each subgroups (ET) was etched with HF acid for 1 min. and the other subgroup (RC) was etched with HF (1 min.), rinsed, dried, silanated (Silane Primer, Kerr) air thinned, and a layer of resin cement applied (Nexus 2, Kerr). Specimens were subjected to biaxial flexural test to determine strength. Results: The mean(sd) flexural strengths (MPa) were GCET=161.7(19.6), GCRC=234.0(56.8), ALET=285.3(50.8), ALRC=341.9(17.6). Both the ceramic type and the presence of resin cement significantly influenced (p<0.01) the resulting biaxial strength (2-way ANOVA). The interaction between resin cement and ceramic type was not significant (p=0.6). Conclusions: Although alumina core materials may have improved strength compared to glass-ceramics, the presence of a resin cement layer can further increase the initial strength. The durability of the bond in service is still unknown. | ||
| Seq #77 - Ceramics and FRC in Fixed Prosthodontics 2:00 PM-4:00 PM, Thursday, 10 March 2005 Baltimore Convention Center Exhibit Hall E-F | ||
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