Resin Bond to Lava Zirconia Intaglio Surface

*1650 Resin Bond to Lava Zirconia Intaglio Surface*
K. KOEHLER¹, A. SADAN¹, J.O. BURGESS², and M.B. BLATZ¹, ¹ Louisiana State University Health Sciences Center School of Dentistry, New Orleans, USA, ² LSUHSC School of Dentistry, New Orleans, LA, USA Clinical recommendations for resin bonding to CAD/CAM-fabricated high-strength ceramic copings (e.g., Lava zirconia, 3M ESPE) widely depend on in-vitro studies that use ground and polished ceramic specimens. However, commercial products create a unique intaglio surface. In order to evaluate bond strength to a commercial product, one should use specimens with same intaglio surface the product has. Objectives: Shear bond strengths of the bonding systems RelyX Unicem (UNI, 3M ESPE), Panavia F (PAN, Kuraray), RelyX ARC (ARC, 3M ESPE), RelyX Luting (LUT, 3M ESPE) were measured and compared to Lava zirconia intaglio surface. Bond strength to ground and polished Lava zirconia was the control. Methods: 80 square samples (10x10x2 mm) were fabricated of LAVA zirconia and randomly divided in two groups with different surfaces: (I) the system-specific intaglio surface and (II) a ground and polished surface. After ultrasonic cleaning, composite-resin cylinders were bonded to the zirconia specimens with the above cements. Shear bond strengths were tested with an Instron after 72 h storage in distilled water. The data were analyzed using ANOVA and Duncan's multiple comparison (a=0.05). Results: For group I, mean bond strength values were: UNI 10.95 ą 4.28 MPa (a), PAN 12.20 ą 2.62 MPa (a), ARC 9.45 ą 1.89 MPa (a), LUT 5.75 ą 1.53 MPa (b). Mean values for group II: UNI 18.03 ą 5.05 MPa (c), PAN 14.18 ą 1.24 MPa (c), ARC 13.95 ą 5.81 MPa (c), LUT 11.88 ą 2.57 (d). Same letters in parentheses indicate no statistically significant difference. Conclusions: Surface configuration had a significant influence on the bond strength to Lava zirconia: bond strength to the Lava intaglio surface was significantly lower than to the polished surface. UNI, PAN, and ARC were not different from each other but significantly higher than LUT, regardless of surface configuration. Supported by 3M ESPE.
Seq #207 - Ceramics: Surface Treatment, Surface Chemistry, and Bonding 11:00 AM-12:15 PM, Saturday, 15 March 2003 Henry B. Gonzalez Convention Center Exhibit Hall C
Back to the Dental Materials: III - Ceramics and Cements Program Back to the 32nd Annual Meeting and Exhibition of the AADR (March 12-15, 2003)
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