| 0829 Tensile Bond Strength of RelyX Unicem to Ceramics | ||
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F. LEHMANN, Christian-Albrechts University at Kiel, Germany, and M. KERN, Department of Prosthodontics, Propaedeutics and Dental Materials, Christian-Albrechts University at Kiel, Germany Objectives: The purpose of this study was to evaluate the bond strength of a self-adhesive luting resin (Unicem, 3M Espe, USA) to densely sintered alumina ceramic (Procera, Noble Biocare, S) and to glass-ceramic (Empress I, Ivoclar-Vivadent, FL) after long-term storage. Methods: Plexiglas tubes (inner diameter 3.2 mm) filled with resin (Clearfil F2, Kuraray, J) were bonded to ceramic disks. Procera disks were air-abraded with 50 µm alumina particles at 0.25 MPa for 15s, while Empress disks were etched with 5% hydrofluoric acid for 60s (Ceramic etching gel, Ivoclar-Vivadent) and then silanated (Espe Sil, 3M Espe). The following groups of 16 samples each were tested: Empress (EL) and Procera (PL) bonded with Unicem in a dual-curing mode by using a curing light, and Empress (ES) and Procera (PS) bonded with Unicem in its self-curing mode without light application. Eight specimens of each group were stored in water either for three days with no thermal cycling (3) or for 150 days with 37,500 thermal cycles (150). Following the different storage conditions, the tensile bond strengths of specimens were determined with a universal testing machine (Z010/024, Zwick, FRG) at a crosshead speed of 2 mm/min. Statistical analysis was done using three-way ANOVA. Results: The mean tensile bond strengths (TBS) in MPa were: (EL-3) 37.2±6.5; (EL-150) 30.6±6.2; (ES-3) 42.0±7.3; (ES-150) 33.8±4.0; (PL-3) 35.4±4.9; (PL-150) 13.8±2.6; (PS-3) 27.1±5.5 and (PS-150) 16.3±4.6. There were statistically significant differences (SSD) among groups as shown by three-way ANOVA. The ceramic material and the storage time had a significant influence (p<0.001) on TBS whereas the polymerisation mode had not (p>0.05). Conclusions: The resin bond strength of RelyX Unicem to alumina ceramic was significantly lower then to glass-ceramic. The bond strengths of the self-cured groups did not differ from the groups with additional light-application. | ||
| Seq #104 - Crowns: Laboratory based Research 3:30 PM-4:45 PM, Thursday, March 22, 2007 Ernest N. Morial Convention Center Exhibit Hall I2-J | ||
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